Document 10896481
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NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES Qayr Qfayr 5 Qtth Tsfgu Qay Tsfgl 7 Qttm QTsf Qayr Trrg Tsfgl Qttm Tsfgu Qayr Qam Qao 8 Qttm Qtth Qayr Tsfgu Qfao Qay Qay Qam Trrg Qpag Qfam QTsf Qay QTsf Qfamh Qah Qay Qayr Trrrs 15 3705000 Qamh Qfay Qtth Qfay Qay Qttm Qfahm Qfaa2 Qao Qfay Qfao Qaym Trrwh? Qam Qao Qfah Qayr Qao Qfahm Qfay Qayr Qaham Qfay QTsf 4 Qary QTsf Qta4 Qar Qfao? Qay Qayr Qfao Qamh Qta3 Qay Qfaa3 Tsflc Qayr Qfam Qta2a Qfaa2 Qfao Qfay 2 Qayr Qam Qay Qah Qfahm 1 Qfayr Qary QTsf Qay QTsf Qay Qpag Qam Qta3 Qfahm Qfah Qfamh 10 Tsflc 8 Qfahm Qay Qta2b 6 Qfaa2 Tsflc Qfahm 5 Qta4 10 Qta1 Qam Qah 8 Qfahm Qfaa1 13 Qamh Qam Qta2b 12 Tsflc 15 11 12 Trac Qta4 3701000 Tsflc 10 6 Qta2b 9 Qfam 10 Qta3 Qayh Qta3 11 Qfah Qaha Qah Qfay Qfary Qam Tsflc Qah Qfam Qam Qfahm Qfahm Qta1c Tsflc 11 Qayr Qamh Qta5 Qta3 Qam Qta2b 33°25'00" 3700000 Qfamh Qta5 Tsflc Qtt Qfay Qayr Qta5 Qta2b Qta1 Qfah 23 Qfay Qfay Qahm Qtt Qam Qta Qta 1c 1b 13 Qam 9 Tsflc 7 8 6 6 6 Qtt Tsflc 6 7 6 Qam 26 23 16 3698000 19 Qay 7 8 Qfam Qfay 7 Qah Qamh 19 7 Qary Qfary Qfam Qay Qam Qfah Qfam 7 Qfam Qam Qamh Qah Qahm Qfay Qta5 Qah Qta5 Qfaa1 QTsf Qfam Qfayh Qfahm Qfaa1 Qay Qayr Tsflc Qahm Qam Qay Qaym Qta1 Qta5 Qao Tsflc Qah Qay Qfaa1 Qayr Qahm Qay Qah QTsf Trac Qao 3696000 Tsflc Qta2b Qfay Qta5 Qay Qay Qaym 270000 Qay 271000107°27'30" Qfam Qam Qam Qta5 272000 Qamh Qta1 Qah Qtt Qtt Qfay Qam QTsf Qta1 273000 STEEL HILL 1 0.5 1000 JARALOSA MONTICELLO MOUNTAIN SIERRA FIJARDO NEW MEXICO 0 107°25'00" Qay 46 1 2000 0.5 3000 57 QTsf QTsf 67 Trrwh 50 PRIEST TANK HUERFANO HILL QUADRANGLE LOCATION New Mexico Bureau of Geology and Mineral Resources New Mexico Tech 801 Leroy Place Socorro, New Mexico 87801-4796 [575] 835-5490 This and other STATEMAP quadrangles are available for free download in both PDF and ArcGIS formats at: Middle tributary terrace deposit –Tread height varies from 18 m above modern grade in Shipman Canyon to 40 m above modern grade in Garcia Falls Canyon. 1-2 m thick in Shipman Canyon. Higher tributary terrace deposit –Tread height varies from 20 m above modern grade in Shipman Canyon to 57 m above modern grade in Garcia Falls Canyon. Maximum thickness of 3 m in Shipman Canyon. Qttm Qary Qahm Qtth Qary 12 Qahm Fan gravel is dominated by the lithologies exposed in the catchments from which fans emanate. Clasts are typically angular to subrounded. Clast composition may be = 90% volcanic lithologies in the northern and western parts of the quadrangle and = 60% Paleozoic carbonates in the eastern parts of the quadrangles. Qahm Trrs Qam Qpas 3697 000 Qary Trrs Qfam Modern-active alluvium on alluvial fans (0 to ~50 years old) – Similar to unit Qam but located on alluvial fans. Probably less than 3 m thick. Qfamh Modern and historic alluvium on alluvial fans, undivided (0 to ~800 years old) – Similar to unit Qamh but located on alluvial fans. <3 m thick. Qfamy Modern alluvium and subordinate younger alluvium on alluvial fans, undivided (0 to ~800 years old) – Similar to unit Qamy but located on alluvial fans. Qah Trrws Trrs Qfao Qfao Qttm Qay Qfay Qay Qpas Qttl Qay Qah Qao Qay QTsf Qah Qtth Qay Qayh Qamh Qah Qfahm Historic and subordinate modern alluvium on alluvial fans flanking Monticello Canyon, undivided (0 to ~800 years old) – Similar to unit Qahm but located on alluvial fans <3 m thick. Qfary Recent alluvium (historical + modern-active) and younger alluvium on alluvial fans flanking Monticello Canyon, undivided (0 to ~800 years old) – Similar to unit Qary but located on alluvial fans. Up to ~10 m thick. Qfay Younger alluvium on alluvial fans (Holocene) – Pebbly sand and pebble-cobble-boulder gravel that is commonly matrixsupported and massive. Local stage II carbonate morphology in fine-grained topsoils, but soil development is commonly weaker due to surface erosion. Minimum thickness 1.3 m (4.3 ft). Qay Qahm QTsf Qah Qahm Qttl Qpas Qttm QTsf Qah Qay Qay Qay Qary Qayh Qay 276000 277000 A 5000 0 6000 A' QTsf Qttl Qttm 278000 Qfayh Younger alluvium and subordinate historic alluvium in alluvial fans, undivided (0 to ~800 years old) – Up to ~10 m thick. Qfayr Younger alluvium and recent (modern + historic) alluvium in alluvial fans, undivided (0 to ~8000 years old) – Up to ~10 m thick. 107°22'30"N Location of geologic cross section Small, minor vertical joint Tlpu Tlpl Horizontal bedding Vertical bedding Gradational geologic contact, location accurate. 23 Inclined bedding, where top direction of beds is known from local features—Showing strike and dip 36 Generic dip-slip fault. Solid where exposed, dashed where approximately known, dotted where concealed, queried where uncertain. NATIONAL GEODETIC VERTICAL DATUM OF 1929 Strike and dip of inclined bedding Inclined bedding, as determined remotely or from aerial photographs—Showing approximate strike and direction of dip 17 Probable generic dip-slip fault. Solid where location accurate, dashed where location approximate. Ttad Ttadw 29 Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program of the National Cooperative Geologic Mapping Act (Award Number: G13AC00186), administered by the U. S. Geological Survey, and by the New Mexico Bureau of Geology and Mineral Resources, (L. Greer Price, Director and State Geologist, Dr. J. Michael Timmons, Geologic Mapping Program Manager). Normal fault. Solid where exposed, dashed where approximately located, dotted where concealed, queried where uncertain. Tic shows fault plane dip value and direction. Probable normal fault. Solid where location accurate, dashed where location approximate, dotted where location uncertain. The map has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources standards. The contents of the report and map should not be considered final and complete until reviewed and published by the New Mexico Bureau of Geology and Mineral Resources. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the State of New Mexico, or the U.S. Government. Location of radiometric date sample Location of geochemistry sample (c) (i) (t) Paleocurrent vectors; tail of arrow is located at measurement. Measurements taken from: channelaxis (c), imbrication (i), or tool marks, grooves (t). Qta2 Trrp2 Trrp2 June 2014 by Daniel J. Koning, Andrew P. Jochems, Shari A. Kelley, Virginia T. McLemore, and Colin T. Cikoski Undifferentiated intrusions, likely felsic. In northern Serefino Canyon, this unit is a highly weathered sill with maroon, clay-rich material at the surface. Solid where location accurate, dashed where location approximate. Tia Tir Tir Tid New Mexico Bureau of Geology and Mineral Resources, 801 Leroy Place, Socorro, NM 87801 Undivided marker-beds within the Placitas Canyon member interval, solid where location accurate, dashed where location approximate. 5 10 15 Interbedded sediment and trachytic volcanic flows, stratigraphically above the Hells Mesa Tuff (lower Oligocene) – Breccia composed of clasts of light gray trachytic lava containing hornblende and plagioclase in an aphanitic matrix; higher up-section the matrix of the lava clasts is more equigranular and contains hornblende and plagioclase. Interbedded with trachytic lavas (unit Trst). About 30 m thick. 20 Trachytic lava (lower Oligocene) – Lavas that contain less than 1% phenocrysts of plagioclase and pyroxene (<2 mm long) in an aphanitic matrix. Above the Hells Mesa Tuff, it includes sandy to conglomeratic to ashy intervals. Individual flows are <30 m thick. Interbedded sediment and andesite volcanic flows, stratigraphically between the Hells Mesa and the Upper Luna Park Tuffs (lower Oligocene) – Red volcaniclastic deposits interbedded with andesites. Sediments are variably silty to conglomeratic. Lavas include vesicular andesite lava containing 15-20% plagioclase phenocrysts and <1% xenocrystic quartz in a fine-grained crystalline matrix, Other lavas in this interval have no phenocrysts and exhibit a fine-grained crystalline matrix. Total interval is 3 to 15 m thick. Interbedded sediment and andesite volcanic flows, stratigraphically between the Upper and Lower Luna Park Tuffs (upper Eocene to lower Oligocene) – In the vicinity of Red Rock Arroyo, the lower 1.5-3 m consists of a reddish-brown pebble conglomerate in a sandy to silty matrix.. Overlying lavas in this interval include brown, foliated, porphyritic andesite(?) containing 3-5% phenocrysts in an aphanitic to crystalline matrix; phenocrysts include plagioclase, potassium feldspar, and pyroxene. ~15 m thick. 25 27 30 Qta3 QTsf ? Tsfgl ? ? Tsflc scale change lavas Tid Gray dikes that variably have a fine-grained, equigranular matrix with no obvious phenocrysts or are slightly porphyritic (<<1% plagioclase and pyroxene <2 mm across) with an aphanitic matrix. Lower unit of Luna Park (upper Eocene) – Near its base, this unit has 15-25% sanidine as well as subordinate biotite, plagioclase, magnetite, and a trace of quartz; near the top of the unit there is 2-15% lithic fragments. The top of this unit near Luna Park Campground is gray, welded, and contains 3-5% biotite, sanidine, and plagioclase phenocrysts with a trace of quartz; the unit here has <1% 5mm lithics. The top of the lower Luna Park Tuff on the east side of Red Rock Arroyo and in the southeastern quadrangle has 10-15% lithic fragments. In the southeastern quadrangle, this unit is relatively thin (6-15 m), has 10-15% fiame (up to 18 cm long), 1-25% volcanic lithic fragments, and contains 5-10% sanidine (up to 5 mm long), 1-3% biotite, and 0.5% hornblende. A basal 1-3 m-thick vitrophyre may be present. Pumice in less welded section is crystal-poor and vapor-phase altered. 10-100 m thick. Trrst Trrtu Trraq Trrsm Trrr Trrl Trrp2 Trrael Trru Trrp1 Trrup Upper Oligocene rhyolitic intrusions filling dikes and stocks that are composed of potassium feldspar and lesser quartz phenocrysts. Solid where location accurate, dashed where location approximate. Upper Eocene dacite dikes, light gray and composed of plagioclase with 7% hornblende, 2-4% biotite, and <5% quartz. Solid where location accurate, dashed where location approximate. Tia 35 39 Trrs Trssv1 Trrst 300 Trrp2 Trrwh Trrup Trraq Trrl Trrael Trru* Trrws Trrwa Tlp Ttjmc Trrr Trrwb Ttad, Ttadw Trrrs Trrg Trrwhn, Trrwhe, Trrwr Tid Trrwbu, Trrwp,Trrwt, Trrwk Trrwl *b *bj *n *nj *r *rj *either radiometric date available or certain correlation to a lithologic unit that has been dated exists. Equigranular hornblende-phyric dacite (upper Eocene) – Equigranular, hornblende-bearing dacite. Trrwhn Dacite with needle-like hornblende phenocrysts – Porphyritic dacite lava with 10% needle-like hornblende phenocrsyts; other phenocrysts include plagioclase laths and pyroxene. Locally plagioclase-phyric. Trrwx Crystal-rich dacite – Crystal-rich dacite lava with phenocrysts that include gray feldspar, hornblende, and pyroxene. Trrwr Rhyolite lava in eastern quadrangle – Flow-laminated, reddish gray to pale red, aphinitic rock interpreted as a rhyolite. Trrwbu Upper biotite-bearing dacite – Thin (2 m-thick), porphyritic dacite lava with phenocrysts of plagioclase, pyroxene, hornblende, and a trace of biotite. 3% xenoliths. Trrwp Pyroxene-bearing dacite – Pyroxene-bearing, porphyritic dacite with 15% phenocrysts of plagioclase, potassium feldspar, hornblende, and pyroxene. Trrwh Hornblende-bearing dacite – Hornblende-bearing, porphyritic dacite with 4-30% phenocrysts that include plagioclase, hornblende, and pyroxene. Trrwt Tuff – Dacitic tuff, pink to white, where lithics are more common near the top. Contains phenocrysts of hornblende, pyroxene, and biotite. 1 m thick. Trrwk Potassium-bearing dacites – Crystal-rich lava that contains phenocrysts of potassium feldspar (< 1 cm long). Trrwb Biotite-bearing dacite – Dacite with biotite and hornblende phenocrysts. Trrwl Porphyritic dacite that includes the following phenocrysts: hornblende, pyroxene, and plagioclase . At least 60 m thick. Paleozoic bedrock Pennsylvanian Magdalena Group Jasperoids replacing sedimentary strata of the Bar B, Nakaye, and Red House formations (Pennsylvanian?) – Pervasively silicified carbonate, sandstone, and conglomerate. Drusy quartz and globular chalcedony commonly fill voids. Individual outcrops are 2-4 m (713 ft) thick. *bj *nj *rj Bar B Formation (upper Desmoinesian-Missourian) – Dark gray to dark brownish gray, thin- to medium-bedded limestone overlain by shale and conglomerate (containing pebbles and granules of limestone, dolostone, and chert). Approximately 75 m thick. *b Nakaye Formation (upper Atokan to middle Desmoinesian) – Light tannish to dark maroon-gray, ledge- to cliff-forming, blocky weathering, thin- to thick-bedded limestone. Sparse covered intervals are probably underlain by poorly exposed, grayish yellow shale. Approximately 330 m thick. *n Gracia Falls trachyandesite (upper Eocene) – Greenish gray to gray (weathering to brown), porphyritic, vesicular, fineto coarse-grained trachyandesite. Although the unit appears to extend slightly over the Uvas Canyon member in a southward direction, in general the two units interfinger with one another. Phenocrysts include 15-80% plagioclase that are locally aligned, 5-10% pyroxene, and trace to 1% hornblende. Commonly altered to chlorite-epidote±albite assemblage, especially near the Deep Canyon Fault. At least 400 m thick. Uvas Canyon basaltic trachyandesite (upper Eocene) – Gray to dark gray, porphyritic, relatively coarse-grained basaltic trachyandesite whose weathered surfaces are typically varnished. Generally conformably bounded above and below by tongues of the Placitas Canyon member. Phenocrysts include: 30-70% plagioclase, 3-10% pyroxene, trace to 5% megacrysts of plagioclase and pyroxene (10-18 mm long), and trace olivine(?). Aphinitic groundmass. Chlorite locally is an alteration product and phenocrysts may be altered to goethite or limonite. 300-480 m thick. Lower Placitas Canyon member (upper Eocene) – Laminated shale interbedded with sandstone and silty sandstone. To the west, strata transition up-section from light greenish gray, sandstone-dominated sediment to tan-yellow-gray sandstone to horizontal laminated, light to dark gray shale. Entire unit is 15-60 m thick and thickens to the northwest. Uvas Canyon basaltic trachyandesite lavas interbedded with the Placitas Canyon Member (upper Eocene) – Uvas Basaltic Andesites, as described above (Trru), that are interbedded with sediment correlative to the Placitas Canyon Member. 20-25 m thick. Red House Formation (upper Morrowan to Atokan) – Interbedded, maroon to pinkish white, quartzose sandstone and conglomerate, dark gray shale, and light gray- to yellowish tan-weathering limestone. Approximately 555 m thick. *r Subsurface Units (Cross section only) Qau Quaternary deposits, undivided (0 years old to upper Holocene) – Valley bottom units principally comprising Qam, Qah, Qar, and/or Qay. Maximum thickness 5 m (16.4 ft). Tvu Oligocene volcanic strata, undivided (lower Oligocene) – Includes andesite-latite of Montoya Butte and perhaps associated basal mudflow breccia (Maldonado, 2012). Maximum thickness ~900 m (2953 ft) according to Jahns (1955). Ku Cretaceous strata, undivided (upper Cretaceous) – Includes the McRae Formation, Dakota Sandstone, and Mancos Shale. Maximum thickness of ~200 m (656 ft) extrapolated from the Gartland 1 Brister exploratory well (Cikoski and Koning, 2013). Permian strata, undivided (lower to upper Permian) – Includes the San Andres, Yeso, Abo, and Bursum formations. Mostly siliciclastic beds interbedded with limestone and gypsum in places. Maximum thickness of ~525 m (1723 ft) extrapolated from the Gartland 1 Brister exploratory well (Cikoski and Koning, 2013). Lower Paleozoic strata, undivided (Cambrian through Ordovician) – Includes the Bliss Sandstone, El Paso Group, and Montoya Formation. The Bliss Sandstone is overlain by a thick sequence of limestone and dolostone. Silurian and Devonian strata are absent in the northern Mud Springs Mountains (Maxwell and Oakman, 1990), and are likely not present in cross-section A-A’. Maximum thickness of ~230 m (755 ft) extrapolated from the West Elephant Butte Federal No. 1 well (Cikoski and Koning, 2013). Pu Whiskey Hill member (upper Eocene) – Thickness of entire unit is about 320-330 m. Differentiated into several subunits: Pzu Volcaniclastic sedimentary rocks interbedded with hornblende-phyric dacite – Light gray to light bluish gray or purplish gray (weathering orange-tan or maroon-brown), volcaniclastic pebble-cobble gravel and fine-grained sandstone; interbedded with fine- to medium-grained dacite flows with the following phenocrysts: 38% plagioclase phenocrysts, trace to 14% biotite, trace to 8% hornblende, and trace to 7% pyroxene. Approximately 130 m thick. Trrws Trrwhe Proterozoic strata, undivided (Meso- to Neoproterozoic) – Reddish gray quartzite, dark gray to brown quartz schist, quartz-biotite schist, foliated amphibolite, and reddish, porphyritic granitic gneiss. Complexly interlayered and contorted (Maxwell and Oakman, 1990). XYu Trrwsj Jasperized volcaniclastic and sedimentary rocks – Strata correlative to unit Trrws that have been replaced and cemented by jasper. 20-25 m thick. Trrwa Plagioclase-phyric andesites of Whiskey Hill member – Porphyritic andesite containing 10-30%, aligned plagioclase phenocrysts and 1-5% pyroxene +/- hornblende phenocrysts. References Chapin, C. E., McIntosh, W. C., and Chamberlin, R. M., 2004, The late Eocene-Oligocene peak of Cenozoic volcanism in southwestern New Mexico: in: Mack, G. H., and Giles, K. A., eds., The Geology of New Mexico—A geologic history, New Mexico Geological Society Special Publication 11, p. 271-293. Cikoski, C. T., and Koning, D .J., 2013, Geologic map of the Huerfano Hill quadrangle, Sierra County, New Mexico: New Mexico Bureau of Geology and Mineral Resources Open-file Geologic Map 243, scale 1:24,000. Trrwb Trrwb Trrwb Trrws 2000 meters ASL *nj Trrwb Trru QTsf Ttadw Qau Trrws QTsf 1800 Trrst Pzu 1600 Ttad Trrr Trrl Trrw Trrw 1400 Ku Pu Tsflc Farkas, S. E., 1969, Geology of the southern San Mateo Mountains, Socorro and Sierra Counties, New Mexico [Ph.D. dissertation]: Albuquerque, University of New Mexico, 181 p. East Trac 1200 *b Pzu *n Tvp Pu 1000 800 XYu 0 Tlpl Trrtu 300 Rhyolite east of Stanley Springs (upper Eocene) – Light bluish to light greenish gray, porphyritic, relatively fine-grained lava that forms cliffs on the hill immediately southeast of Stanley Spring. Typically is well foliated. Probably rests on top of the Garcia Falls andesite and may occupy the same stratigraphic position as unit Trrael. Phenocrysts include: 10-15% hornblende, 8-10% potassium feldspar + lesser plagioclase, and 1-3% quartz. Aphinitic groundmass. 100-110 m thick. *r Hermann, M. L., 1986, Geology of the southwestern San Mateo Mountains, Socorro County, New Mexico: [M.S. thesis]: Socorro, New Mexico Institute of Mining and Technology, 192 p. Jahns, R. H., 1955, Geology of the Sierra Cuchillo, New Mexico: in: Fitzsimmons, J. P., ed., Southcentral New Mexico: New Mexico Geological Society, Guidebook 6, p. 96-104. Lynch, S. D., 2003, Geologic mapping and 40Ar/ 39Ar geochronology in the northern Nogal Canyon caldera, within and adjacent to the southwest corner of the Blue Mountain quadrangle, San Mateo Mountains, New Mexico [M.S. thesis]: Socorro, New Mexico Institute of Mining and Technology, 102 p. Maldonado, F., 2012, Summary of the geology of the northern part of the Sierra Cuchillo, Socorro, and Sierra Counties, southwestern New Mexico: in: Lucas, S. G., McLemore, V. T., Lueth, V. W., Spielmann, J. A., and Krainer, K., eds., Geology of the Warm Springs Region: New Mexico Geological Society, Guidebook 63, p. 211-218. *b *r Trac 600 *n XYu Maxwell, C. H., and Oakman, M. R., 1990, Geologic map of the Cuchillo quadrangle, Sierra County, New Mexico: U.S. Geological Survey, Geologic Quadrangle Map GQ-1686 , scale 1:24,000. 400 Tvp Tvu ? 300 Middle sediment tongue (upper Eocene) – Fine-grained sand (loess) and volcaniclastic sandy pebbles that lie stratigraphically between the Red Rock Arroyo andesite ( Trrr) and the tuff of Aragon Draw ( Ttad). Massive to weakly consolidated. 1-10 m thick. Red Rock Arroyo andesite (upper Eocene) – Gray (typically weathering to light brown to reddish brown), vesicular, ledge-forming, plagioclase-phyric lavas with minor pyroxene phenocrysts. Phenocrysts include 7-25% plagioclase and 0.5-5% pyroxene. Hornblende is locally seen (trace to 3%, 1-15 mm), especially north of Red Rock Ranch. North of Seferino Hill, these occur as tongues in the Whiskey Hill member. 50-110 m thick, being thickest near Forest Road 139 and thinning to the north and south. Luna Peak trachyandesite (upper Eocene) – Gray to light gray (weathering to brown or light brown), plagioclasemegacrystic trachyandesite flows, where >10% of the plagioclase phenocrysts are =10 mm. Very porphyritic and vesicular. Phenocrysts include 40-70% plagioclase, which are commonly aligned, and 0.5-7% pyroxene. Groundmass is =0.2 mm and composed of plagioclase with minor mafic grains. 120 m thick in the north-central part of the quadrangle, thinning to the south-southeast until it pinches out near Jose Maria well. Upper Placitas Canyon member (upper Eocene) – Interbedded shale and limestone, with sandstone beds becoming more common to the north. The main body lies stratigraphically between the top of the Uvas basaltic trachyandesite and the base of the Luna Peak trachyandesite; however, 1-5 m-thick interbeds of this unit are present in the overlying Luna Peak trachyandesite. 1-50 m thick, thinning to the north. Not mapped where it is less than 3 m thick. Andesite east of Luna Peak (upper Eocene) – Relatively fine-grained, gray, porphyritic, vesicular andesite. Located on the west slopes of Luna Peak and lies stratigraphically between the Garcia Falls trachyandesite (bottom) and Luna Peak andesite (top). Correlates to Hermann's (1986) upper andesite member of the Red Rock Ranch Formation. Phenocryst assemblage includes: 25-40% plagioclase and 1-10% pyroxene. Approximately 100-120 m thick. Tsflc Tvu Trrsu Trrsm break and scale change Tuffaceous, fine-grained sediment (upper Eocene) – Tuffaceous, massive sediment in the southeastern part of the quadrangle that lies stratigraphically between units Ttad (bottom) and Tlpl (top). Thickness is poorly constrained, but is at least 15 m, and the unit thins to the northwest. Upper trachyte (upper Eocene) – Bluish-gray lava that contains <1% phenocrysts of plagioclase in an aphanitic to crystalline matrix. The lava filled rugged paleotopography that developed on top unit Trraq. Thickness is variable, ranging from 20-45 m, and pinches out to the east. Upper volcanclastic sediment (upper Eocene) – Reddish gray to light greenish maroon, volcaniclastic sediment consisting of siltstone and sandstone, with minor pebbly sandstone. Laminated to very thin, tabular beds. Unit is preserved between the upper trachyte ( Trrut) and the Questa Spring andesite ( Trraq) on the west side of Red Rock Arroyo. At least 5 m thick. Andesite of Questa Spring (upper Eocene) – Brownish to greenish gray lava, highly porphyritic andesite. Phenocrysts include 30-50% plagioclase, with lesser amounts of pyroxene and magnetite. The plagioclase crystals are < 1 cm and generally 5 to 8 mm long. Unit overlies the Tuff of Aragon Draw in upper Uvas Canyon. Thickness ranges from 30-90 m, pinching out to the south. 4000 1000 ? Trssv2 Seferino Hill conglomerate – Brownish red, well indurated conglomerate containing clasts up to 1.5 m long. Clasts lithologies dominated by Jose Maria tuff and Whiskey Hill hornblende-bearing andesite. Approximately 35-65 m thick. Trrws 2000 ? ? Trst Trrp1 Welded basal part of Tuff of Aragon Draw – Lower 1-12 m of the aforementioned tuff that is pale red to reddish gray and contains 10-20% flattened pumices (fiame). Phenocrysts include trace to 12% (mostly <8%) mafic grains (hornblende and biotite) and 5-20% sanidine-dominated potassium feldspar. Thickness increases to the south. QTsf 3000 Tir Tlpu Red Rock Ranch Formation (upper Eocene) – Interbedded volcaniclastic sediment, lake sediment, and trachyandesite-dacite flows that lie largely below regional tuffs (i.e., below the Luna Park Trrs intrusions Tsc* Tvp* Trssv3 7000 feet ASL 5000 tuffs Trac* sediment A' QTsf Qtt3 Tsfgu Placitas Canyon Qau ? Qta5 Alamosa Creek QTsf ? Thm Upper unit of Luna Park (upper Eocene) – Gray to tan to white and contains phenocrysts of 5-15% sanidine, plagioclase, and biotite. Welding is variable, but generally most pronounced at the base and less welded near the top. The welded intervals are gray and can have rheomorphic fluidal textures. The top of Luna Park Tuff in the north-central part of the quadrangle has 5-10% lithic fragments (up to 0.5 m long), but most lithics are <15 cm in diameter. 75-120 m thick. West 6000 Qpas Qls, Qls-lp, Qls-lpu, Qls-lpl Qfaa3 Geologic Cross Section A Qao Qtt Qta2b Qta2c Left lateral oblique-slip fault, location accurate. Stratiform lineament of jasper silicification, ~4 m-thick. Mostly white to red and dipping 55 degrees to SE. Qlsi Qta2a Right lateral strike-slip fault, location accurate. Geologic map of the Monticello 7.5-minute quadrangle, Sierra County, New Mexico. Qao2 Qao3 0.8 Ma Tuff of Jose Maria Canyon (upper Eocene) – Light gray (weathering gray or tannish orange), largely aphanitic tuff. Correlative to the Jose Maria andesite of Farkas (1969). Occupies a similar stratigraphic position as the tuff of Aragon Draw (Ttad) and may possibly be associated with that ash-fall event. Contains trace amounts of medium-grained, euhedral sanidine and sparse lithic fragments up to 1.2 cm (0.5 in) across. Approximately 40 m thick. Cross sections are constructed based upon the interpretations of the author made from geologic mapping, and available geophysical, and subsurface (drillhole) data. Crosssections should be used as an aid to understanding the general geologic framework of the map area, and not be the sole source of information for use in locating or designing wells, buildings, roads, or other man-made structures. Inclined flow banding, lamination, layering, or foliation in igneous rock — Showing strike and dip 8 ? break and scale change Tuff of Aragon Draw (upper Eocene) – A lapilli- and volcanic block-rich, upward-coarsening, inferred ash-fall tuff whose basal 1-12 m is commonly welded (see Ttadw, below). Overlying the welded zone is a reddish, massive, breccia-like, generally indurated zone consisting of scattered pebble- to cobble-size clasts (minor boulder-size) in a silt to fine-grained sand matrix. Rheomorphic textures are commonly observed. About 25-30 m thick, not including the lower welded unit. Trrg A geologic map displays information on the distribution, nature, orientation, and age relationships of rock and deposits and the occurrence of structural features. Geologic and fault contacts are irregular surfaces that form boundaries between different types or ages of units. Data depicted on this geologic quadrangle map may be based on any of the following: reconnaissance field geologic mapping, compilation of published and unpublished work, and photogeologic interpretation. Locations of contacts are not surveyed, but are plotted by interpretation of the position of a given contact onto a topographic base map; therefore, the accuracy of contact locations depends on the scale of mapping and the interpretation of the geologist(s). Any enlargement of this map could cause misunderstanding in the detail of mapping and may result in erroneous interpretations. Site-specific conditions should be verified by detailed surface mapping or subsurface exploration. Topographic and cultural changes associated with recent development may not be shown. Small, minor inclined joint, showing dip 76 Probable geologic contact. Solid where location accurate, dashed where location approximate. 1 KILOMETER Comments To Map Users ? Qao1 Luna Park Tuff, undivided (upper Eocene) Trrrs Small, minor fault—Showing strike and dip 85 Geologic contact. Solid where exposed or known, dashed where approximately known, queried where uncertain. 7000 FEET New Mexico Bureau of Geology and Mineral Resources Open-file Geologic Map 245 Thm Historic and subordinate younger alluvium alluvium in alluvial fans, undivided (0 to ~800 years old) – Up to ~10 m thick. Qfahy 3696 000 Trrs Qta1c 500 Hells Mesa Tuff (upper Oligocene) – White to pink to peach-colored, lithic-poor (<5%), moderately welded tuff with 5-20% phenocrysts of quartz, biotite, sanidine, titanite, and sparse hornblende. 40Ar/39Ar age is 31.97±0.12 Ma (Chapin et al., 2004). Thickness is variable, ranging from 15 to 60 m. Historical alluvium on alluvial fans (0 to ~50 years old) – Similar to unit Qah but located on alluvial fans. <3 m thick. Qfah Trrs Qpag ? Tuffs below the Vicks Peak Tuff Trrsu Alluvial fan units QTsf 8 Qfay http://geoinfo.nmt.edu DRAFT Tributary terrace sandy gravel deposits, undivided (middle to upper Pleistocene) – Sandy gravel occurring in terrace deposits 13 m thick in tributary drainages to Alamosa Creek. The strath lies above modern grade; surfaces and straths are typically higher than those associated with Qao (compared to modern stream grade). Clast compositions are typically volcanic, but may include some Paleozoic carbonates in Placitas Canyon and drainages to its east. In a given drainage, this unit is locally subdivided into three terraces whose heights differ in elevation above the modern drainage: Lower tributary terrace deposit – Unconsolidated sandy pebble-cobble gravel, with little evidence of calcium carbonate accumulation in its topsoil. Approximately 60-70% of clasts are varnished at the surface. Tread height varies from 10 m above modern grade in Shipman Canyon to 22 m above modern grade in Garcia Falls Canyon. 8-9 m thick in Shipman Canyon. Qttl Trrs Qfayh Trrs CONTOUR INTERVAL 20 FEET Magnetic Declination Nov. 2011 9.30º East At Map Center Older allostratigraphic unit of older alluvium – Upper surface is 2-3 m above the to surface of unit Qao2. ? 11 26 3698 000 daf Gradational geologic contact, location approximate. CHISE Qao3 Qahm Ttjmc 25 1 MILE 4000 Middle allostratigraphic unit of older alluvium – Upper surface is 1-6 m above the surface of Qao1. Qahm Ttjmc 48 QTsf Qct Qay Qpas Trssv1 Ttjmc Explanation of Map Symbols 0 1000 Ttjmc Qls Qay Qtt Qay Qao2 Qtt Qct Qay Younger allostratigraphic unit of older alluvium – Top is 2-3 m above modern stream grade. Qary 33°22'30"N 274000 1:24,000 VICKS PEAK 82 77 Trrwh 74 Base map from U.S. Geological Survey 1961, from photographs taken 1958, field checked in 1961, edited in 1980. 1927 North American datum, Polyconic projection. Reprojected to UTM -- zone 13N. 1000-meter Universal Transverse Mercator grid, zone 13, shown in red MONTOYA BUTTE 54 Qfay Qfah Qta2a Tsflc? Tsflc Qta2c Qta2a Qfaa1 Qfam Tsflc Qtt Qay Qfah Qtau Qahm QTsf Qahm Qay Qfao Qfah Qta5 Qtt 269000 Qfay Qfay Qamh Qah Qta5 QTsf 13Mo-25-AJ 24 Qayr Qao1 daf 34 13 34 39 Qay Qay Qta5 38 Qfay Qfay Qfay Qfamh Qaha Qahy 80 58 Ttjmc QTsf 35 Qpas Qayr Qfah Tsflc 55 Qay 70 58 64 Qay Qfay Qahm 3699 000 55 Qay Trrws 14 22 Qfay Qta5 Qahm Ttjmc Trrr Trrwh QTsf Qay Qam Qta5 Qfah Trrwa 43 Qfay Qay Qta2b Qta2a 63 41 Qpas Qay? Qay Qay 31 Trrwh 13 41 Older alluvium, undivided (middle to upper Pleistocene) – Alluvium alongside drainages other than Alamosa Creek; its surfaces are higher than those associated with unit Qay and typically lower than Qtt surfaces. Base of alluvium is very close to modern stream grade. Deposit and associated surfaces are generally lower than those associated with unit Qtt (described below). Generally consists of interbedded pebbly sand, sandy pebbles, and sand. Topsoil has illuviated clay horizon(s) underlain by calcic horizon(s) with stage II carbonate morphology. 2-5 m thick. Locally subdivided into presumed allostratigraphic units, although buttress contacts have not been observed in the field. Qao Qayr Trssv2 Older alluvium and terraces associated with streams other than Alamosa Creek 72 Qahy QTsf Trrr 29 Qfao Qfam Qta1 Qaym Qayr Tsflc 268000 Qfam 26 Qahm Qaym Qta1 Qam 33°22'30"N 107°30'00"W Qfahy *bj Qfayr Qfah QTsf Qfayr Qfao Qfamy 50 QTsf 51 20 Qfay Qahy Qfah Qah Qfayh Qamh Qtt Qay Qfayr Qam Qao Qta2b daf Qta1 Qaym Qayr Qahy Qah Qfaa1 Qfahm Qahm Qfay Qfay Qfahm Qta2c Qta1 Qay Qtt Qtt Qay Qtt Qfah Qay Qtt Qfay Qfamh Qah Qfahy 51 34 21 42 Qfao Qta5 Qayh Tsflc Qta5 Qfahm Qay QTsf Qta1 Qtth Qayr 57 Qfahy 36 Qfayh 17 Qfamh Qtt Qtth Qfay Qayr Qtt Tsflc Qay Qfayr Qayh Qfay Qta2b Tsflc Qta1 Qahm Qta5 Qah Qam Qah Qary Tsflc Qay QTsf Qfam Qam Qfaa1 Qamh Qta5 Qahm 33°25'00" ? Qta1b Qta4 Rock Springs Formation (upper Eocene to lower Oligocene) – Volcaniclastic sediment and trachyte flows interbedded with formation-rank ignimbrites (note that these ignimbrites are not included in this formation). Terrace deposit whose tread projects to the Cuchillo surface (uppermost lower Pleistocene) – Strath lies 65-85 m above modern stream grade. 4-8 m thick. Qta5 daf Qs Trrr Qfahy QTsf *bj Qay QTsf Qay 8 Qay Qah 31 28 Qta4 Ttadw Tvp Tlp A 6-12 m-thick fill terrace mapped west and north of Placitas. Tread slopes towards southwest and is at least 5 m above the tread of Qta2b. Upper-middle terrace deposit along Alamosa Creek (middle Pleistocene) – A 12-18 m-thick fill terrace mapped in the west-center part of the quadrangle. Strath lies 30-38 m above modern stream grade and is inset 10-12 m below the strath associated with unit Qta4. Upper terrace deposit along Alamosa Creek (middle Pleistocene) – A 7-15 m-thick fill terrace mapped in the west center part of the quadrangle. Strath lies about 45-54 m above modern stream grade. 7-15 m thick. 3700 000 Qayh 55 *b Qfahm Qamh Qah Qamh 12 Strath lies 1-2 m above the strath of Qta2a, but tread lies a few meters above the tread of Qta2a. QTsf Qary Ttad Trrwa Qttm Qta2b Qtt2 400 Vicks Peak Tuff (upper Oligocene) – Pink to white, crystal-poor, welded tuff with less than 1% sanidine; commonly is foliated. Greenish black vitrophyre is common near the base. 40Ar/ 39Ar age of 28.39±0.19 Ma (Chapin et al., 2004). Maximum preserved thickness of 105 m. Top not exposed. Trrr QTsf 19 Qfayh Strath lies 18-20 m above modern stream grade. Qary Qayh Qfayh Qta2a Qfay QTsf Qfao Qta2 Lower-middle terrace deposit along Alamosa Creek (middle Pleistocene) – A strath to fill terrace of variable thickness. Strath lies 18-30 m above modern stream grade. Loose. 2-12 m thick, generally thinning upstream. Locally subdivided into three subunits: Trrwb Qs 35 Qahm Qahy 39 *b A' Qay Qay Qay Qah Trrr 15 26 Qayr Qayh Qay Qamh Qfahm Qam Qay Qfay 3701 000 Qtt 7 Qay Qayh Qtt Qfahm Qta2c Qfay Qta5 Qaym Qam Qfayr Qfah Qfay Qay Qay Qamh Qfay Qayr Tsflc Qfay Qfam Qaha Qahm Qs/Qao Ttad Trrwb Qao 24 Qfahy Qay Qfamh Qfao Qay Qay Qttm Qta5 29 Undifferentiated Alamosa terrace deposit (Pleistocene) – 1-5 m thick. Lies between the Qta1 and Qta2 terrace levels. Trrr? Trrws Trrr 23 *bj Qtau Qay Qfayr Qao 25 Qah Qfah 11 19 83 31 13 Qfay 13 29 Qamh Qam 6 Qfay Qfah Tsflc Qtt Qayr Qfay Qfaa1 Qay Qfayr Qam Qam Qta5 Qtt Qay Qta5 Qay Qfayr 3697000 Qah 22 Trrws 24 *n Qay Qay Qah Qay Qayr QTsf 19 Trrws Qta3 Qary Qfay Qao 41 14 Qfao 16 Qam Qttm 46 QTsf Qam 36 Qamh Qtth 18 *n Qayr *n 43 11 21 29 Trrwa 29 *bj 19 Qta1c Tid 300 Rhyolite of Alamosa Creek (upper Oligocene) – Light gray to gray (weathering to a reddish brown to brown), fine-grained, flow-banded rhyolite. Trace to 2% sanidine phenocrysts. Tops and bases of flows exhibit thick (up to tens of meters) breccia zones. As much as 50-220 m thick west of the caldera boundary (McLemore, 2010). Age is 28.4±0.04 Ma by 40Ar/ 39Ar (McLemore, 2010). Trst Middle subunit of the lower terrace deposit along Alamosa Creek (upper-middle to upper Pleistocene) – Tread lies 2-3 m above the tread of Qta1a. Thickness not accurately measured but likely 1-2 m thick. Upper subunit of the lower terrace deposit along Alamosa Creek (upper-middle to upper Pleistocene) – Tread lies ~2 m above the tread of Qta1b. Thickness not accurately measured but likely 1-2 m thick Qta1 Qs, Qs/x Qct Qta1a Qfaa2 Tuff of Shipman Canyon (upper Oligocene) – Purplish gray (weathering brownish tan), massive to thick-bedded, porphyritic to aphanitic, fine- to medium-grained ash-flow tuff. Forms cliffs in lower Shipman Canyon. Phenocrysts include 6-8% quartz, 2% sanidine, and trace to 1% biotite. Also contains 2-3% glass shards up to 2.5 mm. Somewhat to densely welded. Unit consists of many interbedded flows, including light purplish gray air-fall tuff containing lapilli to fine bombs of aphanitic rhyolite and tuff. Overlies rhyolite of Alamosa Creek. 40Ar/ 39Ar-dated at 28.4 Ma (Lynch, 2003; McLemore, 2010). Approximately 75 m (246 ft) thick. Lower subunit of the lower terrace deposit along Alamosa Creek (upper-middle to upper Pleistocene) – 1-2 m thick. Qta1b Qary Ttadw Trrsm Qao 24 Mo-261b Qfao Trrwb 16 daf 11 39 45 Qfahm 30 Qta5 Qfao QTsf Qttl Qttl Qam 21 Trrr Qay Volcanic bedrock 3702 000 Qta1a Qary Qayr Qtt1 Qfaa1 Qfay Qah Qaha Qahy Qayh Dacitic intrusion (upper Eocene) – Dacite dikes in the southeastern quadrangle. Rock is light gray (fresh) and composed of plagioclase with 7% hornblende, 2-4% biotite, and <5% quartz. Tid Tid Qfary Qfayr 200 Intermediate composition dikes (upper Eocene to Oligocene) – gray dikes that variably have a fine-grained, equigranular matrix with no obvious phenocrysts or are slightly porphyritic (<<1% plagioclase and pyroxene <2 mm across) with an aphanitic matrix. Tia Trssv3 Lower Alamosa terrace deposit (upper-middle to upper Pleistocene) – Tread stands 8-15 m above modern stream grade. 2-6 m thick. Locally, it can be subdivided into three subunits: Qfao QTsf 16 Ti *bj 39 12 24 33 17 76 Qah Qfayh Younger alluvium and subordinate recent (historical + modern +active) alluvium, undivided (800 to 8000 years old) Qta2c Trrr Trrr 31 Qayr Trrwb 26 29 13 31 Qar Trrwb Ttad Trrsm Trrr Qfay 22 Qah Qfay Qah Qam 15 20 Qay Qta2 QTsf 11 Qahm Qtt Qah Qfah Qta1 Qahm QTsf Qay 23 *n Qfah Qta2b 2 Qfay Qay Tsflc Qfahy Qam Qaham Qay Qahm Qfay Qta5 Qta2b Qta1 Qfay 6 Qfaa1 Qar Qahm Qta2c Qta1 Qaha Qfary 7 Qfayr Qfam Qfay 51 34 Qay 29 Qfao 18 Qayr Trrws Qayh *b Younger alluvium and subordinate historic alluvium, undivided (50 to 8000 years old) QTsf Qs/Qao Qfayh 9 daf Qao Tid 8 Trrr Qay Qfayh 56 Qfay 23 Trrr 16 Qfah 14 QTsf 11 Qfay 11 Qayr 16 Trrl QTsf Qam Qayh Qta1 Trrws Qao2 Qao1 Tir Qfahm, Qfamh Qtau Rhyolitic intrusions (upper Oligocene) – Intrusions filling dikes and (less commonly) stocks that are composed of potassium feldspar and lesser quartz phenocrysts. Tir Sandy gravel terrace deposits associated with Alamosa Creek Trrwb Qao Ttad Ti Qamh, Qahm Qfao Undifferentiated intrusions – Intrusions in northern part of the quadrangle that were not field-checked but are likely felsic. In northern Serefino Canyon, this unit is a highly weathered sill with maroon, clay-rich material at the surface. Ti Qam 100 Intrusions Terrace deposits and older alluvium Trrr Qary 34 Qfah Qfay Qay *n Qfayr Qah Qttl Qta1 Qfamh Qam Qfay Qta2c Qay Qta2c Qfao 46 Qfamh Qfayr 27 24 Qfayr 21 Qttm Qam 6 Qfay Qttl Qfay Qahy Qta5 9 Qta2c Qta1 12 Qay 44 31 19 Qayr 24 18 Younger alluvium and subordinate modern alluvium, undivided (0 to 800 years old) QTsf 13 Qs Trrws Qayr Qayr 6 Qfayh Qta5 Qayr Qttm Qttl 71 Qttl 39 Qfao Trrst Ttad Qam 29 *b Trrr Tsflc daf Qaym Qfayh Qfah scale change 50 Lower, coarse-grained Santa Fe Group (Oligocene to lower Miocene) – Sandy conglomerate, with minor pebbly sandstone intervals, that is gray and weakly to strongly cemented. 1500 m thick. Trac Younger alluvium (middle to upper Holocene) – Sand,with subordinate clay, silt, and gravel, occupying the bottoms of modern valleys and underlying low-level terraces alongside modern arroyos. Unit is overall browner than Qao, and less wellbedded and finer-grained than Qah. Except where eroded, the top of this unit typically exhibits a weak soil marked by calcium carbonate accumulation (stage I to II carbonate morphology). Surface clasts are non- to weakly varnished and generally the surface is smooth, although locally subtle bar- and swale- topography is present. Surface is slightly higher than the Qah surface. Loose to weakly consolidated. Estimated thickness of 1-5 m (base is typically not exposed). Qamh Qay Trrwb Qlsi Trrr Trru Recent alluvium (historical + modern) and subordinate younger alluvium, undivided (0 to 8,000 years old) 64 Trrwr 34 Qlsi Trrst Qls-lp Ttad 29 Qary Qayr Qfao Tsfgu Tsc Qaym Trrr Qfay Qls-lpl Trrl Qam Qay Qfao Tlpl Qam 72 QTsf Subequal modern and historic alluvium (modern to ~800 years old) Qls Trrsm QTsf 21 Qay Qayr 16 37 34 Qay 23 Trrr 14 Qah Qls-lpl Tlpu Qls-lpu 26 14 14 Qay 26 34 36 Qttm Qfay Qahy Qttl Qfay Qay Qfayr 7 Qfayr 10 Qah Qta5 Qta1 Qah 7 Qfayh Qay Qaha 7 3 6 7 Qamh Qfayh 85 Qar Qay Qah Qay 13MO15SK 11 13 Qls-lpl Qfao Qay Qfay QTsf 17 *r 35 56 66 Qay Qtt Qahm Qfahm 19 23 Qay 25 Trrp1 Qahm 40 19 QTsf *n Qah Qar QTsf Qao3 Qay Trrwb Qay *rj Qttm QTsf Qary Qta1a Qfaa1 2 Qtt Qah6 7 Qar Qfay Qahm 5 Qta5 Qtt Qttm 71 Qls 11 9 13 Ttadw Qfao Qahy Historical alluvium and subordinate younger alluvium, undivided (~50 to 8,000 years old) Qfao Trrr Qls-lpu 43 13MO17SK Qfao Ttadw Trrst 12 Qsc Qls-lpu QTsf Historical alluvium and subordinate modern alluvium, undivided (0 to ~800 years old) Trrr Ttad Tlpl 13MO14SK Qfao Qamh Qls-lpl 13MO16SK Trrl 33 Qao1 Qao1 3703 000 Ttad Qamh Qahm Qay Qsc QTsf Trrl 14MO25SK Trrp1 3 Qfahm 16 Qao2 Qfayr 24 Qtth Qary Qfay Qfam Qaha 12 23 Qtt Qfam 5 Qary Qta5 Qfaa1 8 20 Qamh Qfay Qtt Qfahm Qfah Qta2b Qfahy Qam Qary Qah Qah Qary Qaha 30 30 Qahm Qfayh Trrup Qam Trrl Qayr Qfay QTsf 5 Qayr Qay Qao Qahm Qao1 Trrl Qayr 3 Qay Historical alluvium of Alamosa Creek and subordinate modern alluvium, undivided (50 to ~800 years old) Qay Trrr QTsf Qay Trrr 3704 000 Qayr Qao Qamh Qar 38 Qfamh 46 41 Qfayr Qfayh 28 Qahm Qary Qam Qta3 3699000 857 9 Qfay Qfah Qahy Qaha Qttl Qam Qta2b Qah Qfao Qtt Qayh Qam Trrp1 Trrwbu *r Qahm Qfah Qfam Qta1 Qam 28 Qfahm Qta5 Qta2b Qta3 Qay Trrp2 QTsf Qay QTsf Qaham Qay Trrsm Qao1 QTsf Qamh Qao2 Qs/ Qao1 Qay Qayr Trrp2 14MO24SK 13 Trru Trru Trrwt Qfay Qahm Qfaa1 Qayr QTsf Tsflc Qfay Qfam Qta1 Qay Qayr Qahm Qfay Qahm Qfay Qah Qta Qta1a 1b Qaha Qfam Qta2 Qfay Qayr Qamh Qay Qfay Qfam Qfay Qfayr Qfayr Qta2b Qfahm Tsflc Qfay Qfam Qamh Qfay Qfao 4 Qam Qfay Qfayr Qay 6 Qay Tsflc Qah Qfam Qta3 10 11 15 Qfay Qfahm Qta2 Qta1 Qfay Qay QTsf 2 Qta1a Qah Qaha 10 Qta2 7 6Qfao QTsf Qfay Qary Trru Trrwp Trrwh Qah 13MO13sk Qay Trrwk 37 Qahy 72 Trrwk Trrws *n 29 50 Qah 400sk Qah Trrws 60 Trrwh39 Qfao Trrwb 59 Trrwl Qahm *r 31 75 25 33 Qam Qah 31 35 *r 47 Qfahm 21 4 60 41 25 *nj 38 Trrws Qfay 60 Trrwb Qfah 12 Qah *nj Qayh Trrwb Qah Qs/ 28 Trrwb Qayr 17 Trrwb Trrwsj 12 Qfahm Qs 31 Qttl 72 52 18 31 29 Qfahm Qay 38 10 Qam 25 46 Qay 43 22 12 Qfao QTsf 31 Qay 40 Qay QTsf Qahm Qfao Qfayr 2 Qfam Qfay Qfayr Qayh QTsf 78 Qta1c Qta1b Tsflc Qah Qary 6 Qs/ Qao3 Qao1 Trrws Trrws *r Trrwb Qam Qfay Qta2b Qfaa1 Tsflc Qfay 4 3 Qfao Tsflc Qfam Qah Qamh Qfam Trac Qfay 80 85 Qay Qayr Qaym Modern and subordinate historical alluvium, undivided (0 to ~800 years old) Qahm Trrr Qs QTsf Trrl Qao3 Qao2 Qay Qamh Qay QTsf Qay Qao2 Qfay Qfao Qao Qao2 Trrwh Trrwp Qayr Trrp2 33°27'30" QTsf Qao2 Qao2 QTsf Qao1 Qao Qay Qao2 Qao2 QTsf Qay Qamh Trrl Qao3 Trrr Qao2 Qay Qs/Qao2 Qaym Qao1 Qam Trrwa *r Qtt Qay10 3 15 Qfao Qamh Qfayh 75 Qah Qary Qfay Qs 12 11 Trrwa Trrwh Tid Qayr 12 Tlpl Qls Qay Qamh Trrr Qay Qay Trrl Qao1 QTsf Trru Qao2 Qay 10 Ttad Qao2 Qs/ Qao2 Qao2 QTsf Ttad Trrr Trrr Qaha Tlpu Qay Tlpu Ttad Trssv1 Tlpl Trrsm Trrr Qah Tvp Qay Ttad Qay QTsf Qao2 10 Trrr Qay Qayr Trru Qao2 Qam Trrr Qao3 Qs Trrp1 Trrws Trrws Trrl Trru Qay 23 Qay Qfay 22 Qamh Qfah QTsf 14 Trrwh Qao Qay Qah Qam 5 Qaha 11 Qfahy Qayh 6 Qtau Qam Qta1 Qfam A Qamh Qaha Qta4 Qfamh Qfao Qaym Qayr Trrwa Trrp1 Tid Trru Qam Qary Qfaa2 3 12 Trrws Trrws 3 Qao Trrwa Qayr Qay 6 Qay Qao3 QTsf Qao2 Qah Trru Qay Qao2 Qar daf Qay Qct Trrwhn Qfao Qfahy Qta2b Qfaa1 Trac 3 Qfao Qao Qs Qao 10 Qao3 Qay Qao1 Qao2 Trru Trru Qs/ Qao1 Qao1 Qah 3705 000 Trst Trst Thm Thm Qao2 Qao1 Qay ? Tlpu Qay Trrl Tlp Qay QTsf Ttadw Qay Qay 16 Qao2 Qct Qfao Qay Qao Qay Qao Qao Qam 2 4 Qfam Qay 14 3702000 Tsflc Qfay Qaha 11 Qam Qah Qfay Trrr Trrl Qay Qao2 Qaym Qay Qao Qayr Trrp2 Qay Trrwh Qfao Qfay Qta1 Qaham Qfah Trrws Qfay Qfay Qfaa1 Trrwhn Qary 4 Trru Qao2 Trrwx QTsf Qay Qfayh Qfah 3703000 Qao Qfay Qfao Trssv3 Qfao Tlp Ttad Historical alluvium (50 to ~800 years old) – Typically well-bedded sand and gravel in valley bottoms. Surface is vegetated, gravelly, and exhibits muted bar and swale topography and channel forms; generally 10-40 cm of surface relief. Sparsely to moderately vegetated and exhibits no obvious soil development. Tread is generally less than 2 m above modern grade. Loose. Possibly up to 3-4 m maximum thickness. Historical alluvium of Alamosa Creek (50 to ~800 years old) – Mostly clayey-silty, very fine- to fine-grained sand, with subordinate gravelly interbeds, deposited in the valley bottom alongside Alamosa Creek. Weakly to moderately consolidated and non-cemented. Possibly up to 4 m thick. Qao Qfay SJ-524 Qay Trrr Qay 29 Qam Qao2 Tvp Thm Trrrp2 QTsf Qfay 35 Trrl Tlp Trrr Qao2 33 Qfao Qao2 QayTrru 19Qao3 27 18 Qayr Trrtu Modern alluvium (0 to ~50 years old) – Sand and gravel in active channels and subjected to annual runoff. Bar and swale topography and channel forms are sharp on gravelly surfaces, with 30-100 cm of typical surface relief. Sandy surfaces are relatively flat and smooth. Vegetation is sparse on both sandy and gravelly surfaces. Loose. Thickness is likely 1-3 m. Qahm Qahm Trssv3 45 Tlpl Qay Qao3 Trrl? Qao Trrp2 30 Trrp2 Tir Qct 38 19 11 Trrwhe25 Qao2 Trrp1 Qao3 7 58 Trrp1 16 10 7 Trrwh Qahm 14 Qayr Trrp2 19 16 Trrl 25 Trru Qayr 39 Qao1 12 14 Qah Trrws 17 Qao2 Qao2 Qay QTsf Qamh 14 Trrwhn 15 Trrwh Trrp2 Qao2 Qao2 Qay 14 Qay Qay Qayr 30 Trrp1 Ttad Qayh Trru Qay Qay Qayr 10 ka Santa Fe Group basin-fill (Lower or Middle Miocene through Pliocene, possibly lowest Quaternary) – Sandy gravel and pebbly sand in very thin to thick, tabular to lencitular to cross-stratified beds. Upper part correlates to the Palomas Formation. Less than 20% moderate to strong cementation over a given 10 m stratigraphic interval. The relatively common, orange-colored intervals seen in this unit, in addition to its lesser cementation, serve to distinguish it from the underlying Tsflc. 300-350 m thick. Upper Gracia falls lithosome in the Santa Fe Group (upper Miocene) – Pebbly sand/sandstone, with subordinate pebblecobble gravel/conglomerate, in thin to thick, tabular beds. Clast composition dominated by intermediate volcanic rocks, including 30-40% clasts from unit Trrg. Sandy beds make up approximately 85% of unit. Approximately 75-80 m thick. Lower Gracia falls lithosome in the Santa Fe Group (upper Miocene) – Sandy pebble-cobble and pebble-cobble-boulder gravel/conglomerate in medium to thick, tabular to broadly lenticular beds. Clast lithologies include subequal proportions of plagioclase-phyric andesite (typically Trrg), crystal-poor Tvp, and aphanitic rhyolite. Minimum thickness of 25 m. QTsf Fractured block of Upper Luna Park Tuff that was translated downslope in a landslide. Dam-related artificial fill(modern) – Valley bottom sand and gravel that has been moved by humans to form dams for impounding water. 10 ka Quaternary-Tertiary Basin-fill Valley bottom units (Quaternary) Qfao Qao2 Qayr Qfay Trru Qao Qfayr Qfayr Qfay Qfahm Qfay 13 Trrp1? Qao Qao Qao Qpas Tsfgl Individual lobe of a landslide deposits (middle to upper Pleistocene) – Landslide deposit as described above (unit Qls) that is inset into older landslide deposits, indicating a younger age. daf Qay Tvp Fractured block of Lower Luna Park Tuff that was translated downslope in a landslide. Qahm Tlp Qao2 Qao Qao2 Trru Qay Qao 8 Qahm Qta4 Qao2 Qfah Qfay Qfay Qao Qfay Trst Trrsm Ttad Qls-lpl 3706 000 Qao2 Qao2 Qay Qayr Tlp Tlp 12 47 Tir Qam Qao2 Trrtu 13MO18SK Qao1 Qfao Qao Trru Qfam Qay Qfah QTsf Qfayr QTsf Qay Qam Qfamh Qfam Qfay Qay Qay Qary QTsf Qfah Qttm Qfay Qta1 Trrr Tir Trst Tir Fractured block of undivided Luna Park Tuff that was translated downslope in a landslide. Qlsi 2 Qfao Qayr Tvp Tlpl Qao Qay Tlp Tlp Qls-lp Qls-lpu 5 Trssv3 Qfao Qao2 Tir 11 Tvp Qao2 Qary 25 Qayr Qfao Qahm Qayr 3704000 4 SJ-400 Tir ARAGON2 Tir Qfamh Qam Tir High-level piedmont deposits near Garcia Falls (upper Pleistocene to Holocene) – Pebble-cobble gravel in medium to thick, tabular beds. Clast lithologies include subequal proportions of gravel eroded from either Trrg and Tvp. Matrix consists of brown, fine- to coarse-grained sand. Deposit may exhibit stage I carbonate morphology in upper 40 cm. Typically 1-3.5 m (3.3-11.5 ft) thick. High-level piedmont deposits south of Serafino Hill (middle to upper Pleistocene) – Pebble-cobble gravel in medium to thick, tabular beds. Clast lithologies dominated by unit gravel correlated to Trrs. Rarely more than 3 m (9.8 ft) thick. Qpag Slopewash deposits overlying biotite-bearing dacite of the Whiskey Hill Member of the Red Rock Ranch Formation (upper Pleistocene to Holocene) Slopewash and colluvium deposits, undivided (middle Pleistocene to Holocene) – Undifferentiated slopewash and colluvium, mapped at the footslope of the hill labeled 6256 in the southeastern quadrangle, where colluvium grades out laterally into slopewash deposits. 1-4(?) m thick. Landslide deposits (middle to upper Pleistocene) – Poorly exposed landslide deposits that flank the hill labeled 6256 in the southeastern quadrangle, consisting of clay to sand mixed with gravel of the Luna Park Tuff. Large blocks of Luna Park Tuff within the landslide deposits are differentiated (see below). Also mapped on the northeast side of Seferino Hill and in upper Cedro Canyon. 5 Qary Tir Qay Tvp Trst Qaym Slopewash deposits overlying the older allostratigraphic unit of the older alluvium (upper Pleistocene to Holocene) Qls 2 Trst Qam Qao Tlp Trrl Qls? Tlpu Qct Ttad Qttm Qfah Qfay Tir Trssv1 3707 000 Qar Trssv3 14MO39 Tlp Qfay Qay Qary Thm Tlp Qfayh Qfao Trrr Trrr Qfam Qam 8 Trssv1 Qam Trrg Qao QTsf Qaha Trrr Ttad Qfam Tir Ttad Trssv1 Tlpl 13MO13SK* Ti Qfay 33°27'30" Trrl 3 Qay Qpag Ttad Tlpu Qao Qay Qah Tlpu? 11 Trrg Tlpl Qfah Tir Qct Qam Qfao Qfam Qah Trrl Qay Qfahm Qfay Qttm Qamh Mo-389 QTsf Tir Qao1 Trst Qao Qam Qao Tir 15 Trrsu Tir Ttad Trrp2 Tsfgu Qfam Qfahm Qah Qay Tir Qayr Thm Trssv3 Qah Tir Tlp 63 QTsf Qay Qam Qao2 Tir Tir Qfay Qs/Qao3 Qsc Qfao 55 Qfao Ttad Qary Slopewash deposits overlying the middle allostratigraphic unit of the older alluvium (upper Pleistocene to Holocene) Trssv3 Trst Qahm Tir Ttad 4 17 6 10 Thm Tir Trrl Qfay 6 SJ-506 Thm Qs/Qao2 70 5 Thm Qfah Qfah Qao2 Trrp2 Qfam Qttm 3706000 Qfay Trrr Tvp Qary Tlp Qfahm Tir 4 Thm Trrtu Slopewash deposits overlying the younger allostratigraphic unit of the older alluvium (upper Pleistocene to Holocene) Qs/Trrwb 5 Qfah Trssv3 Tlp Trrl Qay QTsf Trrr Qao2 Qfahm Qahm Qfao Trssv3 Qs/Qao1 Qahm Qfay Trrsu Trrtu Tsfgu Qfayh Tir Trssv3 Qay Qayr Tir Qay 8 3 Qay Qah Tir Qayr Trrg Qao Qayr 4 Qfahm Tir Qls Trrl Qao 2 Qao 28 QTsf Qay Qam Qfahm Qfam Qah Trst Qfah Tia Trrg Trrp2 Qao Qahm Qfaa1 Qfay Qay Qary Trrp2 Tir Qfam 3707000 Qfay Tir Qary Qay Qayr Trssv2 Slopewash deposits overlying older alluvium (upper Pleistocene to Holocene) Qaham Qar Qfam 0 High-level piedmont deposits Qs/Qao Qfahy 5 Trst Tir Tir Qfaa1 Qfamh 13 Thm Trrtu Tir Tvp 8 Trssv3 3708 000 Trst Thm Tlpl Qtt Qar Tir Qay Tir Qao Qfamh Tlpu 65 Trssv1 Trraq Tir Qayr Qpag Qfaa1 Qfay Qtth 11 Qfay Qao Qfahm 45 ? 19 Qay Qao Qtth Qayr Qahm Alluvial fans graded to the upper-lower terrace tread of Alamosa Creek (upper-middle(?) to upper Pleistocene) – 1-5 m thick. Qfaa3 Qfah Trst 21 Trrtu ? Tsc 5 Qfamh Qpag 54 Trst Qay 66 74 80 Qay Qct ? 27 55 Qahm Tsfgl Tsfgu 8 2 Trrl Trrael 70 Qfahy Tvp Trrtu Slopewash deposits (upper Pleistocene to Holocene) – Sand and pebbly sand forming thin mantles on older Quaternary gravel or on bedrock underlying hill footslopes. Unconsolidated and massive. Maximum thickness 4 m (13.1 ft). Qs Alluvial fans graded to the middle terrace tread of Alamosa Creek (upper-middle(?) to upper Pleistocene) – 1-5 m thick. Qfaa2 Late Qttl Trrr p ? 3708000 Tir 81 85 10 Qahy Qamh Qfahy Qam QTsf Qfayr Qayr Qfah Qahm Trssv3 Colluvium and talus (middle to upper Pleistocene and Holocene) – Poorly sorted, angular to subangular, clayey-silty sand and gravel mantling middle-lower hillslopes. Weakly consolidated. <8 m thick. Qct Qah Qahm Trssv3 Qfay Qfah Trrrp2 Qam Qay Tvp Qfay Qah Qfay Qfayh daf Correlation Of Map Units Middle Qay Trst Tvp Qct Qfah Qfaa1 Early Qttm Qttl Qao Thm Qayr Tsc Qayr Tir Tlpl Tvp Qfahm Qay Qfay Hillslope and landslide units (Quaternary) Late Trrael 72 6 Trst Qfah 42 Qay Trssv3 Qfay Qay Tvp Older alluvium in alluvial fans flanking Monticello Canyon, undivided (upper-middle Pleistocene to lower Holocene) – Sandy pebble-cobble gravel to gravelly sand graded to the surface of Qao. Maximum carbonate morphology of stage II+. Minimum thickness of 1 m. Alluvial fans graded to the upper-lower terrace tread of Alamosa Creek (upper-middle(?) to upper Pleistocene) – Up to 15 m thick. Qfao Middle MONT-13-05 5 Tvp (Partial description of units; complete descriptions are found in the accompanying report) Qao Tvp Tvp Thm Trst Thm Trssv2 Qayr Qfah Qfay Trssv3 Trst Qay Qary Trssv3 Trssv3 Last Modified June 2014 Early Qpag Trst Trssv1 70 Qttm Qam Trrl 80 25 Trst Trst Qao Trrael Qpag Qfao Tlpu 279000 Late Qttl Qah Trst Trssv2 13MO12SK Description Of Map Units 107°22'30"N 33°30'00"N Qfah 278000 Early Tsfgu Qpag QTsf Thm Tlpu Mo-348c 3709000 Qaym Trrg 28 277000 Late QTsf Qpag Qao Qtth 276000 Qay Qao rp2 Trr Qary Trrsu? 15 Trrg Qpag Qayr QTsf 107°25'00" 275000 HOLOCENE Qttm 274000 PLEISTOCENE 273000 PLIO. 272000 MIOCENE Qayr 107°27'30" 271000 OLIGOCENE 270000 EOCENE 269000 PENN. 107°30'00"W 33°30'00"N NMBGMR Open-file Geologic Map 245 A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY Pzu XYu *r 200 Pzu 0 McLemore, V. T., 2010, Geology, mineral resources, and geoarchaeology of the Montoya Butte Quadrangle, including the Ojo Caliente No. 2 mining district, Socorro County, New Mexico: New Mexico Bureau of Geology and Mineral Resources, Open-file Report, OF-535 , 200 p.
