NMBGMR Open-File Geologic Map 251
NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
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33.9-23 Ma
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Qsc
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23-5.3 Ma
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Qtp3
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5.3-0.78 Ma
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55.8-33.9 Ma
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Second or middle-lower tributary terrace deposit—Sandy, pebble-cobble gravel in tabular to
lenticular beds, unconsolidated and massive to imbricated with a brown (7.5Yr 4/4) matrix.
Surface features very weakdesert pavement. Locally subdivded into two deposits: Qtg2a and
Qtg2b with treads 10–12 and 14–23 m above modern grade, respectively. 3–9 m thick.
Tba
Tbau
Third or middle-upper tributary terrace deposit—Sandy gravel in medium- to thick-, tabular
to lenticular beds, unconsolidated and well imbricated. Tread is 26–30 m above modern grade.
5–6 m thick.
Tbal
Fourth or upper tributary terrace deposit—Sandy gravel in medium- to thick-, tabular to lenticular
beds, unconsolidated and well imbricated. Tread is 34–33 m above modern grade. 3–7 m thick.
Modern fan alluvium—Sandy gravel in channels and low-lying bars of modern fan surfaces,
unconsolidated and commonly imbricated, dark-brown (10YR 3/3), and commonly contains up
to 20% boulders. Generally inset against Qfah or Qfay. Thickness likely ≤ 3 m.
Td
Modern and historical fan alluvium, undivided
Modern and younger fan alluvium, undivided
Historical fan alluvium—Sandy gravel and pebbly sand underlying alluviual fans graded to
the surface of Qfah, unconsolidated, slightly calcareious, and clast- to matrix-supported, with a
brown (7.5Yr 4/4) matrix. Deposit features upper A horizon 11 cm thick; otherwise, little to no
soil/carbonate development. 0.6 to perhaps 3 m thick.
Tdl
Ts
Historical and modern fan alluvium, undivided
Historical and younger fan alluvium, undivided
Tks
Recent (historical + modern) and younger fan alluvium, undivided
Younger fan alluvium—Pebbly sand and gravel underlying alluvial fans graded to the surface
of Qfay; loose, clast- to matrix-supported, and tabular to lenticular with wavy beds, with clasts
that may be in an open-framework texture with weak-clay flims, and a brown (10Yr 4-5/3)
matrix. Deposit is capped by topsoil with a weak 8–12 cm thick A horizon. Stage I+ carbonate
morphology occcasionally observed. Base not observed in thickest deposits; perhaps up to 3 m
maximum thickness.
Tkn
Tsl
Younger and modern fan alluvium, undivded
Younger and historical fan alluvium, undivided
Younger and recent (historical + modern) fan alluvium, undivded
Tcc
Older alluviual fan deposits—Sandy gravel occurring in fan deposits graded to sufaces
associated with Qtc1, Qtp1, Qtg1, Qtc2, Qtp2, Qtg2, Qtc3, and Qtg3. Locally subdivided into
three deposits:
Trp
Alluvial fan deposits graded to lower terraces—Sandy, pebble-cobble gravel in thin to thick,
tabular beds, unconsolidated, strongly calcareous, clast- to matrix-supported, and massive to
weakly imbricated, and a light-brown to light-yellowish-brown (7.5-10YR 6/4) matrix. Stage I
carbonate morphology in upper 60 cm of deposit. 3–4 m thick.
Alluvial fan deposits graded to middle-lower terraces—Sandy, pebble-cobble-boulder gravel in
tabular beds, unconsoidated calcareous, and weakly imbricated, and a reddish-brown (5YR 4/4)
to brown (7.5YR 5/4) matrix. Varnish on 60–70% of clasts at the surface. Maximum thickness 4 m.
Trpa
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hm
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276000
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Qf3 Qf3
Qtp1
Qfah
Qf2
Qtp3
QTpt
QTpu QTpt
QTpuc
Qtp3
Qfahy
daf
Qahp
76
QTpuc
Qf3
Qtp1
QTpt
277000
QTpt
Qahp
Qf2
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0
6000
Normal Fault—Identity and existence certain. Solid where exposed, dashed
where intermittent, and dotted where concealed. Queried where identity or
existence is questionable. Bar and ball on downthrown block.
Q
Qary
p
ah
Qay
Qtp3
Qtp1
Qahm
3668000
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Qtp2a
Gradational contact—Identity and existence certain, location accurate.
Qtp3
Dike—Identity and existence certain, location accurate
Qtp3a
Dike —Identity and existence certain, location accurate
Qtp3b
Selected locality; location of radiometrically dated sample
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Horizontal bedding
Ti
Tm
Qtp2b
Scarp on normal fault—Solid where exposed, dashed where intermittent.
Hachures point downscarp.
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Second or middle-lower terrace deposit of Palomas Creek—Sandy, pebble-cobble-boulder
gravel in tabular beds, rare sand lenses, with a brown (7.5YR 4/3) matrix that may containing up
to 5% clay films. Locally subdivded into two deposits: Qtap2a and Qtap2b with treads 14–17 and
17–22 m above modern grade, respectively. 2–5 m thick.
Qtp2
Third or middle-upper terrace deposit of Palomas Creek—Sandy, pebble-cobble-boulder gravel
in broadly lenticular beds, well imbricated with subordinate cross-stratification, with a brown to
light-brown (7.5Yr 5-6/3) matrix. Deposit exhibits stage I+ carbonate morphology with 50% of
clasts coated up to 80% by carbonate rinds. Varnish on 40–50% of clasts at surface. Locally
subdivded into three deposits: Qtap3a, Qtap3b, and Qtap3c with treads 27–34, 33–38, and 38–40
m above modern grade, respectively. 2–7 m thick.
Tia
Tad
Qtp3c
Anticline—Identity or existence questionable, location accurate
Fourth or upper terrace deposit of Palomas Creek—Sandy, pebble-cobble-boulder gravel with a
brown (7.5Yr 4-5/3) matrix. Varnish on 55–75% of clasts at surface. Soil development uncommon
(likely eroded). Tread is 48–53 m above modern grade. 3–7 m thick.
Qtp4
4
Inclined bedding—Showing strike and dip
4
Inclined flow banding, lamination, layering, or foliation in igneous
rock—Showing strike and dip
Upper piedmont facies of the Palomas Formation—Sandy, pebble-cobble gravel interbedded
with very fine- to medium-grained sand, silt, and mud, thin- to very thick-, tabular to lenticular
beds, unconsolidated and non- to moderately calcareous—sandy beds may be planar
cross-stratified—gravels are commonly imbricated and silt/mud is massive, redish-brown (5YR
5/4) with minor-brown (7.5YR 4/4) beds. Contains up to 25% clay chips and/or films. Cambic
(Bw horizon) paleosols occasionally observed. 50–60 m thick.
Transitional piedmont facies of the Palomas Formation—Pebbly sand and sandy-pebble
gravel in thin- to thick-, mostly-tabular beds, moderately to strongly cemented by calcite,
forming promient ledges, sand and gravel are massive to planar cross-stratified with occasional
pebble imbrication, and commonly brown (7.5YR 4-5/3) with little to no clay in matrix.
Paleosols uncommon. 10–15 m thick.
Lower piedmont facies of the Palomas Formation—Pebbly, silt/mud to very fine- or
fine-grained sand in eastern part of quad, mostly unconsolidated, and light-brown to pink
(7.5YR 6-7/3). Massive with commonstage II–III carbonate morphology. 20–70 m thick.
*m
*mb
*mn
*mr
Mlv
Lower basaltic andesite—Black (10YR 2/1) to very dark-gray or dark-gray (10YR-2.5Y 3-4/1),
weathering grayish-brown (10YR 4-5/2) to gray (2.5Y 6/1), typically vesicular and thinly foliated
(flow layering); phenocrysts include trace to 2% pyroxene and trace olivine and plagioclase set
in a slightly glassy groundmass. Up to 5% amygdules filled by calcite or silica. Correlates to unit
Tb of Heyl et al. (1983). 32–57 m thick.
Dacitic lava flows and tuffs—Aphanitic to porphyritic, fine- to medium-grained, dacitic flows,
tuffs, and tuff breccia. Correlates to Td units of Jahns et al. (2006) in the Chise quad. Subdivided
into two units:
Upper dacitic tuff and tuff breccia, with subordinate flows—Weak-red (10R 4/4) to very
dark-gray (5YR3/1), weathering reddish-brown (2.5YR 4-5/4) or dark-reddish-gray (5YR 4/2),
dense to vesicular and porphyritic; phenocrysts include 2–16% plagioclase, 1% quartz, and trace
amounts of biotite, sanidine, and pyroxene. Tuff and tuff breccia contain 10–20% fragments of
pumice; typically non- to weakly welded. 18–25 m thick.
Lower dacitic flows—Dark-gray (7.5YR 4/1), weathering brown (7.5YR 4/2), vesicular and
aphanitic-porphyritic; phenocrysts include 2–4% plagioclase, 2% hornblend, 1–2% biotite, and
trace pyroxene. Contains 5–10% amygdules filled by calcite or silica. 15 m thick.
Volcaniclastic sand—Siltstone to very fine-grained sandstone in thin beds, exhibits planar
cross-stratification with foresets 15–20 cm thick, light-grayish-olive (10Y 6/2) and
non-calcareous. Fills paleovalleys cut into Tdl. Maximum thickness 20 m.
Kneeling Nun and Sugarlump tuffs, undivided—Mapped by vantage reconnaissance and air
photo interpretation due to land access restrictions.
Kneeling Nun Tuff—Pinkish-gray (5YR 6/2), weathering brown (7.5YR 4-5/3), non-welded,
slightly vesicular, porphyritic, fine- to medium-grained, rhyolitic tuff; phenocrysts include
12–15% sanidine, 7–10% quartz, and trace to 2% biotite. Contains 1–2% lithic fragments and
pumice. 40Ar/39Ar-dated at 35.34±0.10 Ma (McIntosh et al., 1991). 12–18 m thick.
Sugarlump Tuff—White (N 8.5-9/), weathering grayish-brown (10YR 5/2), non-welded,
aphanitic-porphyritic, fine- to medium-grained, lithic tuff; phenocrysts include 1–6% biotite and
trace to 2% hornblende, contains 7–8% andesitic fragments and 5–8% pumice fragments,
non-welded, aphanitic-porphyritic, fine- to medium-grained, lithic tuff. 40Ar/39Ar-dated at
35.63±0.15 Ma (McIntosh et al., 1991). Maximum thickness 33 m.
Chavez Canyon Tuff—White (N 8.5-9/)—less commonly brown (7.5YR 5/4)—non-welded,
massive to medium- or very thick-bedded, porphyritic, fine- to medium-grained tuff;
phenocrysts include 15–30% quartz and 5% biotite. Commonly weathered to clay. Contains lapilli
to fine blocks of light pinkish-purple pumice and minor (5–15%) andesite. Locally 5 m thick.
Rubio Peak Formation—Laharic breccia, conglomerate, and tuffaceous sandstone in thin- to
very thick-beds, minor laminated mudstone, weakly to strongly consolidated, clast- to
matrix-supported, and massive to imbricated, commonly silica-cemented with variable color,
including light-reddish-brown (2.5YR 6/3) to dark-gray (2.5Y 4/1). Maximum thickness ~1000 m
from cross-section. Frequently interbedded with andesite.
Andesitic flows of the Rubio Peak Formation—Light-gray weathering buff, porphyritic, fine- to
medium-grained, equigranular andesite; phenocrysts include 10–12% plagioclase and 5–7%
hornblende. Typically ~4 m thick.
Abo Formation—Sandstone and siltstone in thin beds, rippled to cross-stratified, and red to
yellow where altered. Thickness unknown but may be as much as 130 m in the subsurface
[Description from Mayer, 1987].
Magdalena Group, undivided—Interbedded shale, limestone, and conglomerate. Locally
subdivided into:
Barb-B Formation—Limestone and mudstone with subordinate shale and conglomerate.
Limestone is typically thin-bedded and nodular with brachiopods, bryozoans, crinoids, and
gastropods. Mudstone is red, calcareous, and interbeds with chert to quartz-rich pebble
conglomerate in the upper part of the unit quartz-rich pebble conglomerate in the upper part of
the unit. 165 m thick [Description from Mayer,1987].
Nakaye Formation—Grainstone to micritic wackestone and packstone, lacy to globular chert
occurs in micritic beds, whereas chert lenses/beds and nodules occur in grainstone and
packstone. Fossils include horn corals, forams, crinoids, brachiopods, and bryozoans. 123 m
thick [Description from Mayer, 1987].
Red House Formation—Shale and subordinate limestone, siltstone, and conglomerate. Shale is
black, red, or green and fissile. Limestone features lacy chert near top of unit and contains
forams and phylloid algae among other fossils. Conglomerate is cross-stratified and quartzose,
and occurs in the upper part of the unit. 91 m thick [Description from Mayer, 1987].
Lake Valley Formation—Grainstone, crinoidal packstone, and boundstone interbedded with
shale in places. Upper part is strongly silicified to jasperized. Total thickness 48 m [Description
from Mayer, 1987].
Devonian
Dp
Percha Shale—Fissile shale with discontinuous, thin beds of siltstone and very fine-grained
sandstone. Maximum thickness 45 m [Description from Mayer, 1987].
Ordovician
Om
Montoya Formation—Quartz arenite and strongly altered dolostone. Quartz arenite is fine- to
medium-grained. Dolostone silicified, jasperized, and/or brecciated. Maximum thickness 30–60
m [Descriptionfrom Mayer, 1987].
Oep
El Paso Formation—Limestone that is locally sandy with minor silicified sandstone near top.
Maximum thickness 20 m [Description from Mayer, 1987].
Undivided intrusive lithologies—Dikes, sills, small stocks, and plugs composed of varying
mafic to felsic lithologies. Commonly form prominent ledges or buttes.
Mafic sill—Black (N 2.5/), weathering dark-grayish-brown to grayish-brown (10YR 4-5/2),
aphanitic-porphyritic, fine- to medium-grained, mafic sill intruding lower part of Tdu;
phenocrysts include 3–6% plagioclase set in a glassy groundmass and contains deformed
xenoliths of dusky red (10R 3/3), flow-banded, aphanitic lava. 2–11 m thick.
Upper basaltic andesite—Very dark-gray to gray (N 3-5/), weathering light-brown to
grayish-brown (10YR4/3 to 6/2), dense/non-vesicular and occasionally foliated (flow layering);
phenocrysts include 2–4% pyroxene and trace to 2% olivine. Contains trace glass and
disseminated magnetite. Correlates to unit Tyaf of Heyl et al. (1983). 10–20 m thick.
Carboniferous
Lower, coarse-grained piedmont facies of the Palomas Formation—Pebble-cobble gravel in
western part of quad that may be laterally gradational with fine-grained QTpl in northeastern
part of quad, unconsolidated to moderately cemented by calcite, imbricated and/or planar or
trough cross-stratified, and light-brownish-gray to pale-brown (!)YR 6/2-3). Lower part may be
correlative to the Rincon Valley Formation of Seager et al. (1971). 20–350 m thick.
Santa Fe Group predating the Palomas Formation—Pebbly sandstone and conglomerate in
thin- to thick-, tabular to lenticular beds, moderately consolidated (silica or calcite cementation),
massive to imbricated to cross-stratified—minor horizontal lamination in finer beds—Rare
open-framework texture in gravels, and yellowish-red (5YR 5/6) to light-brown (7.5YR 6/4) to
very-pale-brown (10YR7/3). Likely correlative to lower part of the Rincon Valley Formation of
Seager et al. (1971). 105 m thick (Mayer, 1987).
Basaltic andesite—Aphanitic to aphanitic-porphyritic basaltic andesite; obersved phenocrysts
are fine-grained. Likely correlates to unit Tba2 of Jochems et al. (2014) in the Hillsboro quad and
Ta units of Jahns et al (2006) in the Chise quad. Subdivided into two units:
Cambrian
_Ob
Bliss Formation—Arkosic pebble conglomerate grading upward to arkosic oolitic, or quartzose
sandstone. Commonly iron-rich and locally glauconitic. 47 m thick [Description from Mayer, 1987].
Precambrian
Andesitic dike—Light-gray, weathering orange-tan, fine- to medium-grained intrusive
andesite forming dikes up to 30 m wide; phenocrysts include 3–14% plagioclase, 4–9%
hornblende, and trace to 2% pyroxene. Chilled margins are 1.5–2.5 m wide.
=
Andesite-quartz diorite stock—Light-gray (N 7/), weathering gray to brown (7.5YR 5/1-2),
porphyritic, fine- to coarse-grained, intrusive and andesite to quartz diorite, dense; phenocrysts
include 8–10% hornblende, 5% biotite, trace to 3% plagioclase, and trace to 2% quartz. Forms
main body of Garcia Peaks stock. An 40Ar/30Ar-dated sample returned an age of 40.35±0.05
Ma. Equivalent to units Td and Tqd of Mayer (1987). Thickness unknown.
Proterozoic rocks, undivided—Granite, muscovite schist, and metadiorite. Aplitic granite
comprises as much as 65% of Proterozoic lithologies exposed southwest of quad. [Description
from Mayer, 1987].
QTpu
QTpu
278000
33°7'30"N
Vertical flow banding, lamination, layering, or foliation in igneous
rock—Showing strike
107°22'30"W
Inclined magmatic foliation
Inclined fault—Showing dip value and direction
Vertical or near-vertical fault
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This geologic quadrangle was originally mapped using photogrammetry and field observations at a
scale of 1:12,000. This data was then generalized to a scale of 1:24,000 for the publication of this
7.5-minute quadrangle. The 1:12,000 GIS data is available on the New Mexico Bureau of Geology and
Mineral Resources website http://geoinfo.nmt.edu/publications/maps/geologic/home.html for
download.
Â
Ä
Small, minor inclined joint—Showing strike and dip
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Small, minor inclined (dip direction indicated with tic) joint, for multiple
observations at one locality—Showing strike and dip
4
7000 FEET
Small, minor vertical or near-vertical joint—Showing strike
4
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1 KILOMETER
Small, minor vertical or near-vertical joint, for multiple observations at one
locality—Showing strike
New Mexico Bureau of Geology and Mineral Resources
Open-File Geologic Map 251
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Inclined slickenline, groove, or striation on fault surface—Showing bearing
and plunge
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Fluvial transport direction
Sediment transport direction determined from imbrication
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A
J
Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program of the
National Cooperative Geologic Mapping Act (Fund Number G14A500006), 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, Assoc. Director for Mapping Programs).
FIGURE 1—Pliocene basalt flow (unit Tb, above) resting on reddish lower, coarse-grained facies of the
Palomas Formation (unit QTplc, below) southwest of San Miguel church (sec. 10, T. 13 S., R. 6 W.). Note nearly
horizontal beds of QTplc, deposited in proximal environments of the paleo-Palomas Creek alluvial fan
complex. An 40Ar/39Ar sample from nearby Tb exposures yielded an age of 4.57 ± 0.02 Ma for the lowest flow.
Spring—tail in direction of spring outflow
J
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Cross section line and label
FIGURE 2—Andesite dike (unit Tia) intruding laharic conglomerate and breccia of the Rubio Peak Formation
(unit Trp) in sec. 31, T. 13 S., R. 6 W. Plagioclase- and hornblende-bearing dike is up to 30 m wide and does not
intrude strata younger than Eocene in age. Dipping Pennsylvanian beds just southwest of quad boundary are
located in the footwall of a north-vergent thrust fault in the Salado Mountains.
FIGURE 3—Contact between upper piedmont facies (unit QTpu above dashed line) and lower, coarse-grained
piedmont facies of the Palomas Formation (unit QTplc, below). Contact may be sharp and scoured or planar to
gradational over ~3–5 m. Cuchillo Negro Creek flows through middle ground (looking downstream toward
east-northeast). Historical alluvium (unit Qahc) and middle to late Pleistocene terrace deposits (units Qtc4 and
Qtc3, treads above white arrows) are also shown. Sec. 25, T. 12 S., R. 6 W.
Comments to Map Users
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http://geoinfo.nmt.edu
by
Andrew P. Jochems1
Palomas Creek
QTpuc
Trp
Tsf
Qahm
QTpu
Tsf
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4,000
*mn
*mr
Tsf
Tsf
Trp
Mlv
QTpuc
QTpuc
QTpu
QTpu
1,500
QTpu
QTpl
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QTplc
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Om
_Ob
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Trp
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Oep
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Mlv
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Tsf
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Trp
500
*mr
Om
_Ob
=
0 ft asl
Oep
*mn
*mb
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=
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New Mexico Bureau of Geology and Mineral Resources, 801 Leroy Place, Socorro, NM 87801
QTplc
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1
6,000
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.
East
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June, 2015
A’
West
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This and other STATEMAP quadrangles are available
for free download in both PDF and ArcGIS formats at:
Geologic Cross Section
A
Dp
Om
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Mlv
*mr
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Trp
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Geologic Map of the Williamsburg NW
7.5-Minute Quadrangle,
Sierra County, New Mexico
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.



5000

Tsf
First or lowest terrace deposit of Palomas Creek—Sandy, pebble-cobble-boulder gravel in broadly
lenticular beds, massive to well imbricated to trough cross-bedded, with a yellowish brown (10YR
5/4) matrix. Rarely, beds have up to 35% clasts with whole or partial Mn-oxide coats. Stage I+
carbonate morphology observed in upper 1.3 m where 45% of clasts have partial carbonate coats.
Varnish on 10–15%of clasts at surface. Tread is 9–13 m above modern grade. 3–7 m thick.
Qtp1
Upper, coarse-grained piedmont facies of the Palmoas Formation—Sandy, pebble-cobble-boulder
gravel in medium- to thick-, tabular to lenticular beds—rare pebbly sand lenses may be ripple
laminated to trough cross-bedded—clast-supported and massive to imbricated, and a
yellowish-red (5YR 5/6) matrix sand that is fine- to coarse-grained. Generally unconsoliated but
locally features 1–1.5 m thick calcrete (stage IV carbonate morphology) in upper park. Basal
contact is scoured. 9–45 m thick.
Pa
Tertiary




Qtp2
4
QTpuc

Qah
Qtp3
2
QTpuc
Qahm

Qtp2
QTpt
Qtp3

Qayh

 


82

Qaym
QTpuc

 
Qfamh
Qfahm
QTpu
QTpuc
Qay


QTpu
QTpt
Qf3
Qtp2

3669000
Qamh
Qtp3
Qtp2
Qfah



4













 
Qa

 
Qtp3
Qamh QTpt
Qah


QTpt
Qf3
tp
4000
QTplc
Aluvial fan deposits graded to middle-upper terraces—Sandy, pebble-cobbble gravel in
medium- to very thick-tabular beds, weakly consolidated, and massive to weakly imbricated,
matrix-supported, pinkish-gray to light-brown (7.5YR 6/2-3) matrix. Features stage II–III
carbonate morphology in upper 70 cm. Maximum thickness 5 m.
Basalt flows—Dark-gray (N 4/), weathering gray to grayish-brown (!)YR 5/1-2), aphanitic to
aphanitic-porphyritic, very fine- to medium-grained basalt, dense to somewhat vesicular or
scoriaceous and commonly contains amygdules filled by calcite, silica, and/or zeolites;
phenocrysts include 2–5% pyroxene and 2–3% olivine. The lowermost flow of the Palomas Creek
basalts was dated at 4.57±0.02 Ma (40Ar/39Ar). 12–20 m thick.
Permian
















 













 





Q am

































Q fay









































 

 























































Qtp3
Qtp2
QTpt
Qfahm

Qam
Q
1 MILE
Fault—Identity and existence certain. Solid where exposed, dashed where
intermittent, and dotted where concealed. Queried where identity or
existence is questionable.


































275000
QTpl
Terrace deposit of Palomas Creek—Imbricated, sandy gravel occuring in fill and strath terrace
deposits with surfaces higher than those associated with Qay. Clast compositions are
dominated by Tad and other volcanic lithologies derived from the eastern Black Range and
Garcia Peaks, with subordinate Paleozoic sedimentary lithologies (especially Pa). Locally
subdivided into four main deposits:
Qtp
Thrust Fault—Identity and existence certain, location accurate. Sawteeth on
upper (tectonically higher) plate.

3670000
Qtp3
hm
Qfa
0
Geologic Contact—Identity and existence certain. Solid where exposed,
dashed where intermittent, and dotted where concealed. Queried where
identity or existence is questionable.
Oblique-slip Fault, right-lateral offset—Identity and existence certain,
location accurate. Arrows show relative motion.


p2
274000


Qay Qamh
Qamh
QTpuc
A’
Qam

Qahp Qfah
Qahp
QTpu
QTpuc
QTpu



QTpt
Qtp2
Qayh 
Qf3
Qahm
273000
QTpt











































QTpu


Qtp3
QTpt
Qah
QTpuc
QTpuc
J
Qt



QTpuc








Qtp2
Qtc2
Qtc, Qtp






 








 
3671 000





Qf3
Qfahm
Qfah
QTpuc
3000
Qf3
Fourth or upper terrace deposit of Cuchillo Negro Creek—Sandy, pebble-cobble-boulder gravel in
lenticular to tabular beds, may feature vague trough cross-stratification with a strong brown
(7.5TY 5/6) matrix. A 30 cm thick zone of strage III carbonate morphology is observed in places.
Varnish on 40–80% of clasts at surface. Tread is 54–67 m above modern grade. 3–11 m thick.
Qtc4
Explanation of Map Symbols




Qf2
Qahm


Qf1
Third or middle-upper terrace deposit of Cuchillo Negro Creek—Sandy, pebble-cobble gravel
in tabular to lenticular beds, may be planar cross-stratified with a reddish-brown (5YR 5/4)
matrix. Soil development uncommon (likely eroded). Varnish on 40–45% of clasts at surface.
Locally subdivided into 2 deposits: Qtac3a and Qtac3b with treads 28–32 m and 33–45 m above
modern grade, respectively. 6–8 m thick.


Qf
Second or middle-lower terrace deposit of Cuchillo Negro Creek—Sandy, pebble-cobble gravel
in tabular beds witha brown (7.5YR 4-5/4) matrix. Lower 40 cm moderately well cemented by clay
(bridges). Stage I+ carbonate morphology in upper 50 cm indicated by carbonate coats on 70–90%
of clasts. Varnish on 55–70% of clasts at surface. Locally subdivded into two deposits: Qtac2a
and Qtac2b with treads 15–16 and 20–24m above modern grade respectively. 4–11 m thick.
Qtc3b
Qtg1
107°25'0"W
0.5
=


Qfayr
First or lowest terraces deposit of Cuchillo Negro Creek—Sandy, pebble-cobble-boulder gravel in
mostly tabular beds with yellowish-brown (10YR 5/4) matrix. Stage I carbonate morphology
(weak carbonate cement). Varnish on 10–15% of clasts at surface. Tread is 5–11 m above modern
grade. 1.7–3.8 m thick.
Qtc3a

Qahm
QTpuc
272000
2000
Oep
_Ob
33°10'0"N


Qfayh
Terrace deposit of Cuchillo Negro Creek—Imbricated, sandy gravel occuring in fill and strath
terrace deposits with surfaces higher than those associated with Qay. Clast compositions are
dominated by intermediate to felsic, Eocene–Oligocene volcanic lithologies derived from the
Sierra Cuchillo to the west with subordinate Paleozic sedimentary lithologies (especially Pa).
Locally subdivded into four main deposits:
Qtc

Qtp3
QTpt
QTpuc
QTpu
Qamh
QTpu
1000
Om
Qtc2b
Qayh


Qfaym
Younger and recent (historical + modern) alluvium, undivided
Qayr
Qtg1
 
Qtp1
Qfay
0.5
Qayh
m
Qtp3
hp
Qfahm
Qtp3
3
Qa
 

Qca
c
Q ah
c
Q ah c
Q ah




12-0 ka
c
Q ah c
Q ah















Qfay
Younger and historical alluvium, undivided
Dp
Qtc3


Qtc3











780-130 ka

 







130-12 ka









 
































Qfary
Younger and modern alluvium, undivided
Qaym
Mlv
3673000

 




Q fahm


















*mn
*m
Qtc2a


















Pa
*mb
Qtc2











Qfahy
Younger alluvium—Sandy gravel underlying low terraces in valley bottoms, unconsolidated
strongly calcareous, tabular, and massive to moderately imbricated, dark-yellowish-brown
(10YR3/6), a darker and browner color than other valley bottom units. Retains subdued
bar-and-swale topography with less than 30 cm of local relief. Dark A horizon is observed in
upper 20 cm. No varnish observed on clasts at surface. Tread height 1.8–4 m above modern
grade. Maximum thickness of 4 m.
m



?












Qfahm
Recent (historical + modern) and younger alluvium, undivided
Qary



Qahy

ay



Qfah
Historical and younger alluvium, undivided





Q




Trp





Qfamy








Tia
Tad
Precambrian









ah




Qf

 
hp


Qa


Cambrian
542-488
Ma




488-444
Ma

Qtp1
QTpt
Qtp2
Qfah
Qahp
Qam

[575] 835-5490
Ordovician

3
Qam
Qtg3
Qtg2
QTplc
Quadrangle Location
New Mexico Bureau of Geology and Mineral Resources
New Mexico Tech
801 Leroy Place
Socorro, New Mexico 87801-4796
444-416
Ma

Qfah
NEW MEXICO
Williamsburg
Silurian

Qah
Qahm
Qfayr
Qfah

Saladone
Tank
Trpa
Qtc1

Qfah

Bell
Mountain
416-359
Ma
3672000


Q ah Q am
h
Qtg2 Qfahy
Qahm
Qah
1:24,000
Magnetic Declination
September, 2013
9º5’ East
At Map Center
Qfamh
Historical and modern alluvium, undivided
Qahm
?
3674 000

hm
5
Qtg3
Qahm
NATIONAL GEODETIC VERTICAL DATUM OF 1988
Cuchillo
Devonian
QTpuc
h
Qtg4
Qfah
Qtg2
Qfay
6
Qfah
QTpu
QTpuc
Qtg4

 
Qfah
CONTOUR INTERVAL 20 FEET
Williamsburg
NW
Mississippian
359-318
Ma
3675 000
QTpu
Qtp3
Qa
QTpu
Qtg2
Qahm
Qtg2
3
QTplc







hm












Q fa


Qay
4
Thumb
Tank
Peak
Pennsylvanian
318-299
Ma
Qf3
Q am
Qfah
Tsf
Qfah
Qfahy
Qfah
Qtp1 Qahp Qfah
QTpt
Qahm
daf
Qamh
QTpt
Qtp3
Qfay
QTpt
Qtp3
QTpt

Qtg4
8
Qfahm
Qahp
Qtp4
QTpu
1
Tcc
Qtg1
Qfay
hp
Qayh
Qf1
Qa
5
Qfah
Qtp1
QTpu
Huerfano
Hill
299-251
Ma
Qtg1
QTpu
QTpt
QTpu
Qfamh
Qtp3

Priest
Tank
?
Tsl
*mr
Qtg1
Qfahm
Qfahm
Qtp4
Qah Qtg2
Qfahm
Qtg2
Qfah
QTpt
Qahp
Qtp1
QTpt
QTpu Qahp
QTpt
Qtp1
Qf1
Qfah
Qtp3
Qfahy
Qah
Qay
Qamh


Chise
Permian
QTpuc
Qtg1

Qfahy
Qtg4
QTplc
Qfamh
2
Qfahm
Qtp1
QTpu

QTplc
0
Tkn












Qay

Qtp3
Qtg1
Qah
QTpuc
1000
Ti
?
Qtg1
QTpu
p1
Qtg1
QTpuc
1
Tm
First or lowest tributary terrace deposit—Sandy, pebble-cobble-boulder gravel in lenticular
beds, unconsolidated and very weakly calcareous with a brown (7.5YR 4/4) matrix. Tread is 5–8
m above modern grade. 3–4 m thick.
Tb
Tdu
Historical alluvium of Palomas Creek—Silty, very fine- to fine-grained sand and pebble-cobble
gravel; latter are imbricated, internally ripple cross-laminated to planar or trough
cross-stratified, with a brown (10YR 4-5/3) matrix. Upper 40 cm consists of moderately
calcareous sandy silt and 5–20% clay. Clast lithologies dominated by Tb, Tad, various
Eocene–Oligocene andesites and Pa.
Qahp
Ts

Qfay
Qtg2
QTpt
Qahp
2
QTpu
Qtp3
Qfah

Tsf
Qah
Qay Qahy
271000
Qfam
Tbal


Qtg4
Historical alluvium of Cuchillo Negro Creek—Massive to well imbricated to trough
cross-stratified, sandy pebble-cobble gravel and clayey sand; latter may be horizontally lamiated,
clast lithologies dominated by Tba and Tkn with subordinate Pa, with a brown (10YR 4/3)
matrix. Sandy beds typically thinner and more tabular than gravelly beds. Deposit is capped by
an A horizon (<10 cm thick).
Tbau
Tba
Tdl
79
Roads............................................................................©2006-2010 Tele Atlas
Names.............................................................................................GNIS, 2008
Hydrography............................................National Hydrography Dataset, 2005
Contours........................................................National Elevation Dataset, 2000
Tsf
Td



Oligocene

Qamh
Qay
Qt


 




Qtg3
Tributary terrace deposit—Relatively thin sandy gravel underlying terraces alongside
drainages other than Cuchillo Negro and Palomas creeks. Surfaces typically feature weakly to
moderately varnished clasts and exhibit topsoils with weak calcium carbonate accumulation
(stage I–II carbonate morphology). Locally subdivided into four deposits.
Qtg2b
Historical alluvium—Pebbly sand and sandy gravel underlying very low terraces in valley
bottoms, unconsolidated, clast to matrix-supported, and tabular to lenticular. Retains
bar-and-swale topographywith up to 50 cm of relief. May be horizontally laminated. Tread
height up to 1.6 m above modern grade. Perhaps up to 3 m maximum thickness. Unit subdivided
along two major drainages in quad.
Qah
QTplc
Disturbed or artificial fill—Sand and gravel that has been moved by humans to form earthen
dams or has been removed for construction.
Qtg2a
Modern and historical alluvium, undivided
Qamh
QTpl
Qay

Qfahm
Qf1 Qtp1 Qfay
107°27'30"W
Base map from U.S. Geological Survey 2010.
North American Datum of 1983 (NAD83) World Geodetic System of 1984 (WGS84).
Projection and 1000-meter grid: Universal Transverse Mercator, Zone 13S
10 000-foot ticks: New Mexico Coordinate System of 1983(west zone), shown in blue.
QTp QTpt
Qtg2
Modern alluvium of Palomas Creek—Gray to grayish-brown (10YR 5/1-2), massive to rippled to
well imbricated, and clast lithologies are approximately 40% andesite, 30% felsite, 15–20%
diorite, and 10–15% basalt and Palezoic sedimentary lithologies. Sand typically contains more
mafic and chert grains than Qamc.
Qamp
3676000

mh

QTpt
Qtp2
2
QTpu

270000


Qay

QTpuc
?
Qahc
Qay

Qtp2
Qah

269000
107°30'0"W
Qahm
QTpuc
QTpu
Qfay

Qfahm
Qtg2
Qtg2
QTpu

Tsf
Qfayr
Qah
QTplc
5
Qa
Qah

QTpuc

6
Qfah
Qah Qtg2a
Qtp3
QTplc

Qtg1
Q am
QTplc
Qfah
1
Qf2
Qtg2
Qfayr
Qahm
Qtg2
daf
Qah
QTplc

Qf1
Trp

QTplc
Qamh
Qtg2a
Qtg2b
Qahm
Qfamh
QTpuc



268000
30 Qfay 15
Tsf
17
Tcc

Trp
Qay

267000
Qah Qfah

 20
5

Trp
Qfah
66


Qtg2 Qay
Qfaym
Qtg3 Qfah
Qay

Trp
Qfahm
Qtg1
Qah
9
QTplc
Qfah
Qay
83
51
26

Qayh
Qfayh
Qah
Qam
Ts
f
Qahy
Qah Qahm
Qtg2
70
9 Qtg2b
QTpu
Qfahm
Qtg1


Qfah
Trp


Qahy
Tcc
36 26
32
Qah

Qah
Qf1
33°7'30"N
Qayh

Qah
Qam
Qfay
Qtg1
Qfayh


Qtg1
3668000
26 Qamh
60
79
Qah
Qay
QTpuc
17 74
Trp
Qtg1 Qtg2 Qay
Qfah
Qfah
78
19
Qtg3 Qtg2
Qahm Qay Qah
56
Qah Qfay
79
Qahm
Qah
Qay
Qtg1
Qtg2 Qay
Qayr
Trp
Qayh
Qam Qah



Trp
66


QTpuc
3669000
12
46
Qfahm Qtg1
Qayr
17 81
18
28
Qfah
Qtg1
Qay
12
Tsf Qtg2
Qah
Qtg2 Qtg1

Qfayr
QTpu
daf
Qah
Qah
5
Qahm
Qfahy
Qamh
QTplc
QfayQahm 
Qfahm
Qay
Qfamh


Tsf
18
21
QTplc

 26
Qca

6
QTpuc

Qca Qay
Qah
Qfamh
Qtp3

69
QTplc
Qfahm
QTpu
Qtp2
Qtp1
Qfay
Qfamh
Qahp
Qtp3


Qfahm
Qtp3
Qtg1
Qfahm Tb


80
uc
Qay
p

QTp
daf
Qfah
Qtg2b
QTplc
QTplc


81
Â
34
 35
45
3670000
Qfay
Qfah
ah
62
Qamh
Qah
QTplc

4.57±
0.02 Ma

A
QTplc

55

5
QTplc
QTpuc
Q
Qca
3
Qtp3
Qfary
f1
55
70




Qahp
Q
64
Qfamh
Qfamh

Â


Qtg2
Qtg2a
Qtg2
Qfary
6
QTpu
Qay?
Qtg2
QTpu
Qfamh
Qay Qah
Qtg3
Qfah
10
QTpuc
Tad
4
QTplc
Qtg1
5
Qtg1

Qtg2a
Qtg1
?
Qfay
Qfah

9

Qtg2
Qamh
QTpuc
Qca
QTplc
Tsf
?
Qaym

Tsf
Qay
?
Qtg4
?

QTpu
Qay
QTpuc


*mb

Qam
3
QTpuc
Qfamy



Ti
Qtg1
Qtg1
Qah
5
Qfah
Qfay
Qfahm

Pa
3671000

QTpu
?
3678000
Eocene
Qtg1
QTpu
QTplc
Qamh
Qamp

25

75
Tsf
 15



QTpuc
Qahm


Qtg1 Qtg1
30

Qtp3
QTpu
Qtg2
Qtg2a
Qfah
Qfam
Qah
Qahy
Qtp3c
Tks

QTpuc
Qfamh
Qamh
Qtg2a
81
?
Landslide deposit—Unstratified/massive sand and gravel comprising translational slide
material, weakly consolidated, gravel is poorly sorted, angular to subrounded, and consists of
pebbles, cobbles, and up to 20% boulders, light-yellowish-brown to pale-brown (2.5Y 6-7/3)
matrix. Deposits are located on failure planes formed on weak volcaniclastic material or on
over-steepened, fault-bound slopes. ≤8 m thick.
Modern alluvium of Cuchillo Negro Creek—Dark-grayish-brown (10YR 4/2), massive to trough
cross-bedded to well imbricated, and clast lithologies are approximately 45% adesite+dacite,
30–35% Paleozoic carbonate and detrital sedientary lithologies, 20% felsite and 5–10% chert and
conglomerate. Lithic sand grains are somewhat less heterogeneous than Qamp.
Qamc
Tb

QTpuc
QTplc
Qtp3


Qay


QTpuc
Pa



Qahm

Qay
Qaym


Qahm
Qtp3
Qtp1
Qtp4
Qah
Qfam
Qahm 5
QTplc
QTpu
Qtg1

Qam
69
11
 844
Qfamh Qay
Qah
6

Qary 20
Qamh

Qfahm
Qfah

QTplc
Qtg1


QTpuc
Qtg1
Trp
Qfah
QTplc


Trp
Qay
Trp
82
Qahy


Qahm

Qay
3672000

14 Tsf
4 80
QTplc
14
Qfahm
Qaym

Tsf
QTplc
Qay
Qtg1
daf

13
Qamh
Qay
Tsf
Qahm
71
Qf3
Qtp3b


Qahp
Qfahm
Qtg2
Qf3
Qtg3
Qtg1
h
Qfah

daf
QTplc
Qtg2
Qa
QTpuc

 25
Qayr
Qtg1
Qamh

daf
Qfahm Qfamh
Qayh
Qah
QTpuc
Qay
Qay

QTpuc

Tad

Trp
Qay
QTpuc
Tsf
Qf
Qtg3
?
?
?
?
Qtg1
Modern alluvium—Unconsolidated sandy gravel and gravelly sand underlying channels and
forming transverse to longitudinal bars with 0.7–1.25 m of local relief. Thickness likely ≤3 m.
Unit subdivided along two major drainages in quad.
Qam
Qls
QTpuc
33°12'30"N
QTplc
Qtp3
Qayr
 5 76
QTplc
Qfay
Qay
Qah
QTpuc
QTpuc
Qtp2
Qfahm
QTplc
Qay Qtg1

Trp
Tad
Qahm
Qfayr
Qfah
Qfay

Qay
?
Qtp3a
Qf2
QTpu
3677000
daf
Qfahy
Qfayr
Qay
75
QTplc
Tsf
QTplc
Qtp3
Qfah
Qahm
QTpu
Qtg2b
Tdu
daf
Qaym
Qtp3
QTplc

Tad
Qtg1
Qamh
Tad
QTpuc
Qah
Tsf
QTpuc
Qfayr

80


Qay
Trp
60
Qtg1
Qfamh
Qfahm
Qfay
Qahm
Qah

Qay
33°10'0"N

Qfay
Qam
Qay

Trp
Tsf
Qay
Qahm
Qah Qamh
3673000
daf

Qfaym
Qayr
Qfay
Qfayr Qay Qayh
Qah
Miocene


Qay
Trp?
Qay
Qtg1
Qtp3
Qamh


Qamh
Qfah
hm
QTpuc
Qfahm
Qtp1
4 Qah
Qay Qtg2
Qfary
Qtg1
Qay
Qahy
Tad
h
Qfah
QTplc
QTplc
QTplc
Qtp2
daf
QTplc
QTpuc
Qtg2 Qahm
Qay
Qfaym
Tad
75
60


m
Qa
Qaym

Qah
fa
Qfahm
Qtg2a
Qah
Qfayr QTpu
Qtg1
QTpuc
Qfay
Q

Qamh
Qamh
QTplc
Qfah
QTpuc
Qay 77 Qtg1 Qahm
20
QTplc
Qtp3

Tad
*mb
plc
QT
Qfaym
Qay
Qtg2
Qahm
Qls?
Qf3
Qfah
Qtg2
Qfay
Qtp3
daf
Tb
Qay

Qaym
Qay
Tad

Trp
*mb
c
Qay Qah
Qtg2
Qayr
Tad?
p3
Trp
Qt

Qaym
3674000
Qtg1
Qtg1
Qahm
Trp
Qaym
QTplc
QTplc
Qf3
Qfamh
Tb
Qary


daf

Qahm

Qah
154
19
Qtp3
Qtp4
Qahp
Tb
Qahy
daf
Qtg1
Qahy?
daf

Trpa
Qfahm
QTplc


Qfayr
*mb
QTpuc
Trpa
77
Qaym
Qah
Qay?
daf

Qtg1
Trp
Qfah
?
?
Qtg
Qtc3a Qtc2b Qtp2b
?
?
Qtg2a
Qtg2
?
?
Qtc3b
QTpuc


QTplc
Qay
QTplc
Qtg1
Qtp4
Qfam
daf

Trpa
Qtp3b
Qamp
QTplc
Qary
Qary
QTpuc
Qahm
Trpa


Qayh
Tb
Qtg1


Trpa
Qaym
88
Qay
Ti
Qca
Qfam
Tb
Qaym
Qtp1
QTplc


Qay
Qfah

Qay
Qah
Pa
Qfaym
Qah

Qf2
Qca
Tb
Qamh
Qtg2
Qaym
Qfaym
Qfaym
Qfay
Tb
Qtp3a
Q ahp
Qca
Qfahm
p
Qary
Qf1

ah
Trp

Pa
Qfah
Qf1

4.57±
0.02 Ma
Qaym
10
m
Qtp4
Qahp
Qtp1
Qtp2
Qtp3
y
Qah Qfay
Qfah
ay
Qtp3
Qamp
Qfahm
11
Qaym
Qay
Qfah
Qca
Qa
Qfah
Q
Tsf
QTplc
Qary
Qf1
Qf1
Pa
QTpuc

Qamh
Tb
Qfah
3675000
Qtp3c
Qah Qfah
p

Tb
Qfay
Q
Tsf
Qca

Trp
Qf1
Qfam
Qtp3c
Qahp
Tb
Tsf
Qay

Qtp3a
Qahp
Qtp1
Qfahm
Qfamh
QTplc
Qtp3b
Qary
QTpuc
Qtp3b
Qtp3c
Qf3
Qay
Qtp3c
Qfah
Qtp3a
QTpuc
QTplc
Qahm
Qahm
Qtp2
?
?
daf
3679000

Qfah
Qay
Qf1
Qtg1
Qtc4 Qtp4

Qf3
Tks
Qahy
3676000
Tsf
Tsl
Qca
Qtp3b
Qay

Qtp1
Qahp
Qfam


Qfay
Qamh
QTpuc
Qfah
Qtp3a
20
Qay


Qfah
Middle
Pleistocene
Pliocene
to early
Pleistocene

Trp
Qay
Qfah
Qtp3b
Qtp1
Qahp
Qay
Tkn
Qfary
Qahp
Qfam
QTpuc
Qtg1
Qahp
Qfah Qahp

Qay
daf
Qam
Qahp

QTpuc
Qary

Qay
Qfahm


Tks
Qfahm
Qtp2

Qay




Qay

Qay
QTpu

Qay
Qay
Q tp3 b
Qfah
Qahp
3677000







daf

Qfahy


 

y

Qfah
Qamh
 15


Qtp1
Tks
QTpuc

Qtp3b
33°12'30"N
Qahm
Qahm

Q
Qtp2
Qtp3
3680000
QTpu
2
Qayh
Qahy
?
Qtc2a
Qamh
Qamh
QTpu














Qah
Qtp2a
Qtc1 Qtp1
Qfah
Qtc3b







Late
Pleistocene
Qfah
QTpl
1
Qfahm
Qam

QTpu


Tsl
p
QTpl
Qtc3a


QTpuc
Qamh


QTpu
Qamh

Qfay
Qay
am
Qfary
pu
QT
Qtc3
Qtc3
Qls
daf


Qah
Qfah
QTpl

Qa
Qfay
QTpuc
Qfary
Qfah
Qtp3a
QTpl
Qtc2
Holocene
 


Qtg1
Qf2?
Qfah
Qfary
QTpu
QTplc
Qfah
Qtc3
Qam

Qf1
Qam
Qamh
Qfary

Qaym
Qay
Qay
Tks
Qtp3
QTplc
QTplc

Qf2?
Qfayh
Qf1
Qf3
QTplc


Qfay
Qtp2
Qtp3
Qtp1
Qahc
Qahc
Qahc

Qay
Qay
3678000
Qfamh

QTpuc
Qamh
Qfay
Trp
QTplc
QTpl

QTplc
Qtg1
Qfahm
QTpl
Qahm
Qfah
Qfahm
Qam
Qtc2a


Qah
Qay

55

QTpuc
daf
Qtg3?
Qamh
Qay
Qamh
Qamc
Qahm


Qtg1
33

3679000
Qtg1
Qtg1
QTpuc
Qaym
Qay
Trp
Qay
Qfah
daf
daf
Qtg
Sheetwash and colluvium, undivided—Pebbly silt and silty to sandy gravel in wedges
prograded over terrace deposits and in the hanging walls of low relief fault scarps,
unconsolidated, somewhat to moderately calcareous, and massive. Color reflects source lithology;
for example, reddish-brown (5YR 5/4) to dark-yellowish-brown (10YR 4/4). Stage I carbonate
morphology observed in upper part, with occasional stage II–III paleosols. 0.8-2.1 m thick.
Qsc
3681000
c
Q am

Qf1
Qay Qah
Tsl
10
Qtg1
Qay
66
Qary
Qam
Qamh
Qam

75
Qfary

Qahc
daf

QTpl
Qfahm
Qahc

Qamh

Trp
Qfah Qfahm
QTplc
Qahc
Qtc3a


52
Qtc3
QTpl
daf


Qayh

Ä


66
46
Trp
Qfah

Qay












Trp
Qfah
Qfah
Qtc3a
Qfahy,
Qayh,
Qfayh
Colluvium and alluvium, undivided—Poorly sorted gravel with subordinate silt and sand
forming aprons at the base of high angle slopes. Gravel are typically angular to subangular.
Maximum thickness ≤6 m.
Qca
Qam
Qtc4
Qtc3 Qtc2a
Qfam
Qtc2a Qtc2b
QTplc
Qfah
Qtc1 Qfah
Q
fa daf
hm
Qahc
Qahc
Qamh
3b















































Tkn
Trp

Tb
Tsl
Qahm
3
Qfahy
Qfahm
Q tc
Qtc2
Qahc,
Qahp,
Qfah
Qfamy,
Qfary,
Qaym,
Qfaym,
Qayr,
Qfayr, Qfay
Last Modified June 2015
Description of Map Units
Quaternary
Qahm
Qtc4
Qamh
QTplc
Qtc3
Qfah
Qamc
Qfah


Tkn
Qfah
hm
Qtc3
QTplc
33°15'0"N
QTpu
Qtc4

QTpuc
QTpu
Qfahm
Qtc3

33
3680000
Tb
daf
Qfay
Qamh
Qay
daf
Qa
Qamc
Qahy
Qtc3

Qahc
Qtc3
Qtc3
QTplc
QTpu
Qtc3


Tkn
Qtc3
QTplc
daf
Qahy
daf
Qfah
Qamh
Qtc4
QTpu
Qtc4
Qfamh,
Qahm,
Qfahm
Qamc,
Qamp,
Qfam
278000

Tsl
Qfah
QTplc
Qay
Qfah
Qahc
Qamh
277000

7
Tsl
Qtc2
Qtc2
Qfahm
Qfahy
QTpuc
Tdu
Qaym
Tkn
Qay
Qfah
Qtc3
Qtc4
107°22'30"W
276000
QTplc Qfahm

Tsl
Tsl
Tkn
QTpu
QTplc


Qfay
Qfah
QTplc
Qfah
daf
Qahc
Qahc
Qfay
daf
m
Tsl
2
Qfay
Qfaym
daf
Qtc3
fa
ym
QTpuc
Tdl
Tsl
QTplc
Qfahm
QTplc
Q
Tm
Qa
4
Tdu
QTplc
Qsc
Qamc


Tdu
Tbal
Tbal
Qaym


Qahc
Qtc4
Qfah
Qtc4
Qay
Qfay
QTplc
107°25'0"W
275000
274000
Qtc1
Qtc1
Qahc
3
QTplc
3
273000
hc
Qls
41 Tdl
Tdl
Tm
24
81
Qtc4
Qfay
Qtc1
Qamc
Qahm


Qay

Tdu Tdl

Tm

Tdl

Tdu 13
83
42
QTplc
37
63
QTplc
Tbal
Ts
Tdu
Ts

3681000
Tdu
Tbal
QTpuc
Qtc4
272000
daf
Qamh

76
41
Qtc4


Tdu

Tbal

Tbal
7
Tdu
39
QTplc

Tbau
Tbau


81
Tbau


Tbal
Tbau
QTplc
Tbal
daf
Qa



Ä

Tdu
Tbal
Tdu
Tdu
107°27'30"W
271000Qfah
Qfamh

43
Tbau
24
al 51
Tb
81
Tdu
47
270000


33°15'0"N
269000

268000

107°30'0"W
Correlation of Map Units
0 m asl