NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES
A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
107°37'30"W
NMBGMR Open-file Geologic Map 172
107°35'0"W
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107°32'30"W
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Last Modified 19 May 2008
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34°30'0"N
TbH5
Kcc
Kcc
Kcc
Qvy
2
Kcc
Kcc
11
Kcc
Kcc
Kcc
Kcc
Kcc
12
3816000
2
9
Kcc
Tpg
2
Kcc
Kcc
6
Qtc
5
6
4
6
Qtc
4
Tpg
Qtc
4
9
Kcc
7
3
6
7
Qtc
Qtc
Qtc
Qvo
6
Qtc
Qvo Qvo
4
Qvo
2
6
Qtc
7
4
Qt
Qvy
Kmd
KgKmd
Kg
4
3
Kth
Basanite (Pliocene) — Does not crop out in the Table Mountain quadrangle.
TbH3
Basanite with phenocrysts of olivine (Pliocene) — flow up to 8 m thick, separated from underlying
and overlying flows (TbH2 and TbH5, respectively) by several meters of piedmont gravel (Tpg); sample
number 384.
TbH2
Alkali olivine basalt with phenocrysts of olivine and plagioclase (Pliocene) — xenoliths of
granulite and clinopyroxenite are present, and megacrysts of plagioclase and black augite are abundant;
vesicular, platy parting; much alteration material and secondary carbonate in vugs and vesicles; flow,
up to 8 m thick, overlies <1-3 m of scoriaceous rubble and is separated from TbH1 on southern Tres
Hermanos Mesa by 2 m of fine grained brownish sediments (basaltic ash?); sample numbers 380 and
383.
3813000
Qvy
6
Kcc
7
4
7
Kg
Qvo
TbH1
5
Qvy
Qtc
34°25'0"N
Kcc
Qvy
2
Kcc
Qvy
4
Kcc
5
5
9
6
14
Ti
3811000
Ti
7
4
Qvy
4
Tpg
000
3811
34°25'0"N
3
8
3810000
Qsg
Qae
Tpg
Qvo
Tpg
4
2
Qsg
Qtc
3
10
Qtc
Qae
3810000
Tpg
Kcc
Qvy
Kcc
11
Tpg
Tpg
4
Kcc
Kcc
Tpg
Qae
Kcc
999
14
Kcc
Tpg
5
Tpg
Kcc
Tpg
7
Qae
7
Tpg
3808000
Tpg
Tb
8
Tb
Td
Tb
Tpg
Tb
Tpg
Tb
Tb
6
Tpg
3807000
Tsp
Tb
3807000
9
Td
11
34°22'30"N
34°22'30"N
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107°37'30"W
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107°35'0"W
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1
34107-E4
NEW MEXICO
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Mountain
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May 2008
1
QUADRANGLE LOCATION
This draft geologic map is preliminary and will undergo revision. It was produced
from either scans of hand-drafted originals or from digitally drafted original maps
and figures using a wide variety of software, and is currently in cartographic production.
It is being distributed in this draft form as part of the bureau's Open-file map series
(OFGM), due to high demand for current geologic map data in these areas where
STATEMAP quadrangles are located, and it is the bureau's policy to disseminate
geologic data to the public as soon as possible.
After this map has undergone scientific peer review, editing, and final cartographic
production adhering to bureau map standards, it will be released in our Geologic Map
(GM) series. This final version will receive a new GM number and will supercede
this preliminary open-file geologic map.
DRAFT
270000
Geologic map of the Table Mountain
quadrangle, Socorro County, New Mexico.
34107-D4
34107-C4
269000
107°30'0"W
1:24,000
34107-E5
268000
107°32'30"W
Base map from U.S. Geological Survey 1964, from photographs taken 1963, field checked in 1964.
1927 North American datum, UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
34107-E6
Magnetic Declination
May, 2008
9º 52' East
At Map Center
0.5
0
1 KILOMETER
by
Steven M. Cather and W. Scott Baldridge
1
CONTOUR INTERVAL 20 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
New Mexico Bureau of Geology and Mineral Resources
Open-file Geologic Map
1
2
New Mexico Bureau of Geology and Mineral Resources, 801 Leroy Pl., Socorro, NM, 87801
2
Los Alamos National Laboratory, Los Alamos, NM, 87545
OF-GM 172
COMMENTS TO MAP USERS
Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program
of the National Cooperative Geologic Mapping Act, administered by the U. S. Geological Survey,
and by the New Mexico Bureau of Geology and Mineral Resources, (Dr. Peter A. Scholle,
Director and State Geologist , Dr. J. Michael Timmons, Geologic Mapping Program Manager ).
New Mexico Bureau of Geology and Mineral Resources
New Mexico Tech
801 Leroy Place
Socorro, New Mexico
87801-4796
[505] 835-5490
http://geoinfo.nmt.edu
This and other STATEMAP quadrangles are (or soon will be) available
for free download in both PDF and ArcGIS formats at:
http://geoinfo.nmt.edu/publications/maps/geologic/ofgm/home.html
Kdt
Twowells Tongue of Dakota Sandstone — light yellowish gray, very fine to fine grained
marine sandstone; unit coarsens upward and is highly bioturbated; thickness 1-3 m.
Kdm
Main body of Dakota Sandstone — light yellowish-gray to very pale reddish-gray, very fine
to coarse sandstone; minor pebble-to-granule conglomerate and conglomeratic sandstone at or
near base of formation; thickness approximately 8 m.
Triassic
TRc
Chinle Group — continental red bed sequence of mudstone, minor sandstone, and pebbly
sandstone, approximately 580 m thick.
Qtc
Qt
Pleistocene to Recent
Qvo
unconformity
Pliocene
TbH1-H6, TM
Tpg
Ti
Miocene? to Pliocene
unconformity
Td
Tb
`
middle Eocene-Oligocene
middle Eocene
unconformity
Kcc
Kg
Kmd
Kth
Upper Cretaceous
Kmr
REFERENCES
Baldridge, W. S., Perry, F. V., and Shafiqullah, M., 1987, Late Cenozoic volcanism of the southeastern
Colorado Plateau; I, Volcanic geology of the Lucero area, New Mexico: Geological Society of
America Bulletin, v. 99, p. 463-470.
Broulliard, L. A., 1984, Geology of the northeastern Gallinas Mountains, Socorro County, New Mexico:
M. S. thesis, New Mexico Institute of Mining and Technology, Socorro, NM, 161 p.
Cather, S. M., 1980, Petrology, diagenesis, and genetic stratigraphy of the Eocene Baca Formation,
Alamo Navajo Reservation and vicinity, Socorro County, New Mexico: M.A. thesis, The University
of Texas, Austin, TX, 240 p.
Cather, S. M., 1986, Volcano-sedimentary evolution and tectonic implications of the Datil Group (latest
Eocene–early Oligocene), west-central New Mexico: Ph. D. thesis, The University of Texas, Austin,
TX, 484 p.
Osburn, J. C., 1982, Geology and coal resources of the Alamo Band Navajo Reservation, Socorro County,
New Mexico: New Mexico Bureau of Mines and Mineral Resources, Open-file Report 160, 160 p.
Tb
Baca Formation (middle Eocene) — red-bed sequence of sandstone mudstone, and minor
conglomerate of fluvio-deltaic origin; upward-coarsening cycles 5-30 m thick characterize depositional
sequences; unit is poorly exposed within quadrangle; estimated thickness 300 m.
Osburn, J. C., 1984, Geology of the Pueblo Viejo Mesa quadrangle, Socorro and Cibola Counties, New
Mexico: New Mexico Bureau of Mines and Mineral Resources, Geologic Map GM-55, scale
1:24,000.
5
Tpg
3808000
Lower part of Mancos Shale — medium to dark-gray marine shale; not exposed in quadrangle
due to cover; estimated thickness in cross section approximately 90 m.
Qvy
3809000
4
3
Tpg
Datil Group (middle Eocene-late Oligocene) — volcaniclastic rocks of andesite-dacite composition
consisting of fluvio-deltaic sandstone, conglomerate, and mudstone, and conglomeratic debris-flow
deposits; clasts are light gray and contain abundant phenocrysts of plagioclase, amphibole, and
titanomagnetite (± biotite, clinopyroxene); approximately 970 m thick.
4
9
3809000
Piedmont gravels and sands (Miocene?-Pliocene) — correlative to Santa Fe Group; volcaniclastic
detritus derived from Gallinas Mountains (southern part of quadrangle) and from upthrown, western
side of Red Lake fault system to west (northern part of quadrangle); pebble imbrications indicate
easterly transport directions on west flank of Tres Hermanos Mesa (Fig. 1); underlies and intercalated
with basalt flows TbH2, TbH3, and TbH5 on Tres Hermanos Mesa; locally underlies TbTM near Table
Mountain; moderately indurated to nonindurated; 0-60 m thick.
Td
6
Tpg
5
4
Rio Salado Tongue of Mancos Shale — gray to light-brown calcareous marine mudstone
with thin (1-2 cm) siltstone beds; Pycnodonte newberryi is abundant near base of unit; poorly
exposed; estimated thickness 75 m.
Qsg
Paleogene sedimentary and volcaniclastic deposits
9
Tpg
2
Qae
Basaltic vents (Pliocene) — cinder cones and/or subvolcanic plugs, and dikes; includes plugs of
alkali olivine basalt that form Tres Hermanos Peaks (K-Ar age of southwestern peak is 4.3 ± 0.1 Ma.;
sample number 417, Table 1) and basanite flow unit intercalated in cinder cone on southeastern Tres
Hermanos Mesa (sample number 378, Table 1).
Neogene sedimentary and volcaniclastic deposits
12
Tpg
Alkali olivine basalt with phenocrysts of olivine, megacrysts of plagioclase, and vesicular, platy
parting (Pliocene) — much alteration material and secondary carbonate in vugs and vesicles; flow
is approximately 6 m thick and overlies up to 1 m of scoriaceous rubble; sample number 379.
9
4
5
Qvy
TbTM
Kml
D-Cross Tongue of Mancos Shale — gray to olive gray, slightly calcareous marine mudstone;
locally contains concretions, some of which contain fossils (Prionocyclus novimexicanus,
Coilopocerals inflatum, Lopha bellaplicata); poorly exposed; estimated thickness 15-35 m.
Table Mountain Quadrangle
3812000
5
Qvy
Qvy
Qae
Qt
5
Kcc
Kg
6
7
22
4
Kcc
6
Qvo
11
3812000
Qvo
11
7
10
3
Qvo
TbTM
TbTM
Basanite (Pliocene) — possibly a composite unit consisting of coalesced flows from several vents,
dark gray in color, with phenocrysts of olivine and plagioclase; ranges from dense to vesicular with
platy parting; xenoliths of granulite and megacrysts of plagioclase and black augite are present along
western edge of Tres Hermanos Mesa; flow is 6-7 m thick and overlies 2-3 m of scoriaceous rubble on
southern end of Tres Hermanos Mesa; this unit overlies a thin (< 0.3 m) scoriaceous rubble zone and
is separated from underlying flow (TbH2) by 5 m of basaltic ash, plagioclase megacrysts are common;
sample numbers 355, 381, and 382; K-Ar age 4.0 ± 0.1 Ma.
TbH4
Tpg
5
TbTM
TbTM
Kmd
Kcc Qvy
Kg
Qvy
Kcc Kcc
3
Tpg
Qae
Kg
Kg
Qvy Kmd
Kg
4
Qae
TbTM
Kmd
Kg
Kcc
10
Qtc
Kmd
Qt
6
Qtc
3813000
Kgo Qvy
Qvo
2
4
4
TbTM
Basanite (Pliocene) — probably a composite unit consisting of coalesced flows from several vents,
phenocrysts of olivine; megacrysts of plagioclase and black augite; vesicular, platy parting, light gray
in color with spotted appearance on weathered surfaces along eastern Tres Hermanos Mesa, xenoliths
of pyroxenite and granulite are abundant; thickness ranges from 8 m along western edge of Tres
Hermanos Mesa to 20 m along eastern edge, where it is separated from underlying flow (TbH5) by 2-4
m of basaltic ash and cinders and, locally, piedmont gravel (Tpg); along western Tres Hermanos Mesa
this unit is separated from underlying unit (TbH5) by up to 24 m of piedmont gravels (Tpg); sample
numbers 356 and 375.
3814000
4
Kcc
7
3
TbTM
TbH6
TbH5
Kg
6
Kcc
Tpg
Tpg
Kmd
Qvy
Qtc
Kmr
2
Kmd
Kg
4
0
Alkali olivine basalt (Pliocene) — light gray in color; phenocrysts of olivine; rare megacrysts of
plagioclase, flow approximately 8 m thick; sample number 385; 3.7 ± 0.1 Ma.
3815000
6
5
4
Kcc
Kcc1
Kg
5
Qt
Qtc
14
Kcc
TbTM
Qt
5
Tpg
Qtc
TbTM
7
Tpg
3814000
Qvo
Qt
Qt
Qae
Qvy
Qtc
4
4
Qt
9
2
Tpg Kcc
Tres Hermanos Formation — continental and marine unit consisting of a basal regressive
sandstone (Atarque Member, 4-5 m thick), a medial continental shale and sandstone sequence
with thin coals (Carthage Member, approximately 60 m thick) and an upper, transgressive,
shore-zone sandstone (Fite Ranch Member, 6-7 m thick); individual members not mapped.
Qvy
Qvy
Qtc
Kth
TbTM
Kth
Qtc
Tpg
Gallup Sandstone of Mesaverde Group — yellow gray sandstone comprising two upwardcoarsening, stacked shore-zone sequences, prominent iron-carbonate cemented horizons
common in mid-upper parts of shoreface sequences locally contain Ophiomorpha and Lopha
sannionis; thickness approximately 25 m.
Kmd
4
9
4
Qvy
3816000
34°27'30"N
10
2
5
3
5
Crevasse Canyon Formation of Mesaverde Group — nonmarine sandstone, carbonaceous
shale, and minor coal deposited in meandering river and floodplain environments, thickness
approximately 650 m.
Kg
Basaltic lava flows (Pliocene) — subscripts correspond to flow units of Baldridge et al. (1987), in
ascending stratigraphic order, except TM = Table Mountain; K-Ar dates from Baldridge et al. (1987);
sample numbers correspond to analyses in Table 1.
Tb
6
4
Kcc
Neogene volcanic deposits
5
5
4
Qtc
Kmr
Kmr
Ti
Qae
5
9 Kmr
Kth 6
Qvy
Tpg
3815000
12
Qtc
6
4
Kcc
Ti
Ti
Tpg
Kcc
5
Kcc
6
Kmr
16
11
12
8
Qae
TbTM
34°27'30"N
Stream terrace sands, silts, and gravels related to the ancestral Rio Salado; 0-7 m thick.
Kth
2
7
Kcc
4
Qt
3817000
4
Qvy
Kcc
Older valley-fill sands, silts, and gravels >2-3 m above modern stream grade, 0-10 m thick.
9
Tpg
Qae
Kcc
Qsg
Kcc
Kcc
Qvo
Kmr
28 999
14
6
TbH1
Qtc
Tpg
2 Kcc
Qtc
Kcc
Qt
12
Kcc
Valley-fill sands, silts, and gravels near modern stream grade, 0-15 m thick.
14
3817000
Qt
Qt
Qvy
11
7
Kcc
Kcc
Sand, silt, and gravel deposited on upland surfaces by fluvial and eolian processes.
11
Qt
Tpg
Kcc
Qae
3
Kcc
Qae
Tpg
Tpg
Kcc
14
2
Kcc
Talus and colluvium, 0-10 m thick.
7
Kcc
Cretaceous
Qtc
Kth
Kcc
3
Kcc
Kcc
Kcc
Kcc
Alluvial deposits (Pleistocene-Holocene)
3818000
4
Qvy
MESOZOIC
Sand, gravel, and silt in modern ephemeral stream channels, 0-15 m thick.
24 Kg
Qtc
CENOZOIC
Qsg
Qvy
2
Qt
999
Qtc
Kmr
QtcKdt
Ti
Kcc
52
Ti
Qt
2 Kcc
Kcc
Kcc
TbH2
Qt
Qt
Qt Kcc
Qtc
Kdt
68
12
28
Qvy
3818000
Kcc
3
Kcc
Tpg
TbH5
Kdm
Kdt
Kdt
CORRELATION OF UNITS
DESCRIPTION OF MAP UNITS
Kdt
Kcc
TbH2
Kcc
Kcc
3819000
42
5
Kcc
Kcc
Kcc
TbH6
Qtc
2
5
5
TbH5
3
Kcc
Kcc
Kcc
Kcc
Kcc
Qvy
3
Kcc
Qt
4
Kcc
2
Qt
3819000
Kmr
@c
1
Kcc Qae
Tpg
Kdm
Kcc
Qtc
6
Kcc
Qtc
Kcc
Tpg
5
Qvy
Qtc
TbH3
Kcc
Kcc
2
Kcc
Qae
9
Kcc
Kcc
5
Qsg
Kcc
TbH3
5
Kcc
Tpg
TbH2
Tpg
Kcc
3820000
4
9
Kcc
Kdm
@c
Kdm
Kdm Kdm
@c
10
Kcc
Kcc
Kcc
@c
8
999
Kdm
13
3
7
34°30'0"N
Kcc
Kcc
16
Kcc
Kcc
Kcc
7
7
Qvy
Kcc
Kcc
Tpg
10
Tpg
5
Qvy
Qsg
3820000
Kcc
Tpg
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.
Cross sections are constructed based upon the interpretations of the author made from geologic
mapping, and available geophysical, and subsurface (drillhole) data. Cross-sections 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.
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.
Figure 1. Paleocurrent measurements from pebble imbrications in unit Tpg on west flank
of Tres Hermanos Mesa near northern boundary of quadrangle. n = 41.