NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
106°45'0"W
340000
341000
342000
106°42'30"W
343000
344000
NMBGMR Open-file Geologic Map 90
Last Modified May 2006
DESCRIPTION OF MAP UNITS
345000
346000
106°40'0"W
347000
348000
349000
106°37'30"W
350000
QUATERNARY/NEOGENE
351000
Anthropogenic deposits
34°45'0"N
34°45'0"N
Qrg
af
Qed
QTsas
Qrgm1
Qrg
Qrgc1
af
QTsasm-c
Qrg
Qrgc1
daf
Qed
QTsas
Qe
QTsacs
AM
Qrgm1
Qrgm1
QTsasm
Qrgm2
Qrgc1
1
Qrgm2
3845000
3845000
Qrg
1
QTsasm-c
Qrgm1
Qrg
Qed
QTsacs
Qrgc1
Qedo
Qe
AM
Qrgm2
QTsa-c
Qrgc1
Qrg
Qay
Qrgm1
af
Qed
Qae
QTsa-c
QTsasm-c
3844000
af
Qae
Qe
af
Qem
Qay
Qed
Qed
Qem
Qrgc2
Qay
Qrgc1
af
Qae
QTsacs
af
3843000
Qay
Qay
AM
Qay
QTsacs-c
Qrgm2
QTsa-c
2
QTsacs
af
QTsasm
QTsa-c
QTsacs
QTsa-c
QTsacs-c
af
Qrgm1
QTsa-c
Mills Tome #1
QTsacs
Qay
QTsa-c
Qae
Qem
Qed
AM
Qem
Qedo
Qae
af
QTsacs-c
Qed
Qrgc1
Qay
3842000
QTsa-c
34°42'30"N
af
Qrgm1
Qrgc2
AM
QTsacs-c
AM
Qem
QTsacs-c
Qed
AM
QTsacs
Qed
Qrgm1
3841000
Qrgm2
3841000
QTsasm-c
Qrgc1
af
Qrgc1
QTsasm
Qem
AM
Qed
Qem
af
Qrgc1
QTsasm-c
Qed
Qrgm2
AM
Qem
AML
?
AML
?
?
QTsl
?
?
?
?
?
?
3,000'
Tpu
?
?
?
?
-2,000'
Tpl
Tpl
?
?
?
-3,000 ft
BSL
1,000'
Sea Level 0'
?
Tpl
-1,000'
?
?
Tpl
?
-2,000'
Base of Tpl Unknown
No Vertical Exaggeration
-3,000 ft
BSL
A΄
A
West
East
5,200 ft
ASL
Offset of shallow units across Aeromagnetic Lineaments (AML) (inferred faults) is unknown
AML
5,000'
fault
scarp
NMOSE-NL
Rio Grande
Qae
Water Table
(Titus, 1963)
Qrg
?
?
?
?
AML
AML
AML
?
?
?
Grober-Fuqua #1
Mills Tome #1
NMOSE-T1 fault
AML
scarp
5,200 ft
ASL
62691
Qedo
AML
Qedo
?
?
AML
?
?
?
5,000'
Qsu
Qsu
Qsu
Qae
Qrgc2
4,800'
Qed
Qed
683000
64853
Modern channel facies (Historic) — Unconsolidated sand
and gravel within the active channel of the Rio Grande.
Generally modified from the unit W35 of Pearce and
Kelson (2004) (i.e., the channel in 1935) using the 1996
digital orthophotoquad, and also includes units Rib35 and
Rsb35 of Pearce and Kelson (2004).
2,000'
?
?
?
?
?
?
?
?
?
?
?
Tpu
Tpu
?
4,000'
QTsl
?
?
?
1,000'
-1,000'
?
?
?
5,000'
Qsu
Tpu
Tpu
Sea Level 0'
AML
QTsl
?
?
AML
Qsu
QTsl
?
6 ,000 ft
ASL
Mills Tome #1
Qsu
?
?
NMOSE-T1
AML
?
2,000'
Water Table
(Titus, 1963)
?
4,800'
?
4,600'
Qedo
Qae
Qrgc2
?
QTsl
Rio Grande alluvium, undivided (Historic to upper
Holocene) — Unconsolidated to poorly consolidated
coarse-grained sand and gravel with lensoidal interbeds
of fine-grained sand, silt, and clay. Forms the lowest inset
fluvial deposit of the inner valley and floodplain of the Rio
Grande and basal deposits are significantly coarser-grained.
Largely disturbed by agricultural fields and housing
developments. Interfingers with and is overlain by Qae at
valley margins. Correlative to the Los Padillas formation
of latest Pleistocene-Holocene age (Connell et al., 2000).
Thickness ≤ 30 m.
AML
Qsu
Qsu
34°42'30"N
Qem
3842000
AML
5,000'
The Rio Grande floodplain alluvium is divided into four
subunits, where possible, based upon geomorphic mapping
of Pearce and Kelson (2004), who utilized both 1935-vintage
aerial photography (depicting the floodplain prior to
tamarisk infestation and significantly less disturbance from
mechanized agriculture) and 2001 color orthophotography.
These map units were modified following McCraw, et al.
(2006), resulting in two channel deposits (Qrgc2 and Qrgc1)
and two meander-bend deposits (Qrgm2 and Qrgm1), which
are largely comprised of scroll bar sands and fines and mark
former channel localities. The bases of these units are not
exposed, but are commonly 20-25 m thick in this vicinity,
based upon well logs.
af
QTsasm
Qrgc1
3843000
Qae
Qed
QTsasm
AM
af
Qay
af
af
Qae
Qrgm2
Qe
Qeda
af
Qrgm1
Qae
QTsa-c
QTsasm
3844000
Qrgc1
af
QTsasm
QTsasm-c
NMOSE-NL
3,000'
Qed
QTsacs
QTsacs
Qrgm1
QTsacs
Grober-Fuqua #1
Alluvium of the Rio Grande Floodplain
af
AM
af
NMOSE-T1
Qrg
Disturbed land and/or artificial fill — Areas extensively
affected by human disturbances, primarily associated with
gravel mining and/or construction.
East
Net displacement across zone estimated from Lozinsky (1994), Russell and Snelson (1994), and Maldonado, et al. (1999)
Rio Grande
6,000 ft
ASL
A΄
Strands of Palace - Pipeline and/or West Hubble Spring, West Joyita faults (?)
4,000'
Qae
Qrgc2
3846000
QTsasm-c
Qed
5
3846000
af
Qedo
Qed
QTsasm
QTsacs
af
Qrg
Qed
A
West
Artificial fill — Dumped fill for highway and railroad
grades as well as stock tanks.
4,600'
Qsu
Modern channel facies and scroll-bar deposits (Historic
to upper Holocene) — Unconsolidated sand and gravel
deposits of former Rio Grande channels and scroll bars
recognized in aerial photography. Corresponds to the units
Hch, Hsb, and Hib of Pearce and Kelson (2004).
4,400'
4,400'
Qsu
3840000
Qsu
Qrgc1
Qrgc1
QTsasm-c
daf
AM
Qrgm2
Qem
Qrgc1
QTsa-c
Qrgc2
Qrgc1
3838000
QTsa-c
QTsa
Qed
3838000
QTsa
Qedo
af
Qae
Qae
Qbf
QTsasm
QTsa
A'
AM
Qrgm2
QTsa
Qrgc1
Qeda
AM
AM
AM
Qe
AM
Qrgc2
daf
3836000
AM
64853
Qrgm1
Qed
Qe
Qae
3836000
Qedo
Grober Fuqua #1
af
AM
Qrgm1
Qed
Qedo
3835000
AM
Qe
3835000
af
Qrgc2
AM
Qrgc1
Qrgc1
3834000
Qe
Qed
Qbf
AM
Qrgc1
Qrg
3833000
Qae
NMOSE-NL
Qedo
Qe
106°45'0"W
340000
341000
342000
343000
344000
106°42'30"W
345000
347000
106°40'0"W
348000
349000
A
1:24,000
0.5
0
A'
350000
AM
1000
TOME
Tome
QTsas
0
1000
2000
3000
4000
5000
6000
7000 FEET
NEW MEXICO
1
0.5
0
1 KILOMETER
5
0 ka
Dip and dip direction of bedding
TOME SE
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:
http://geoinfo.nmt.edu
Arrows showing mean direction of paleoflow, based upon pebble
imbrication.
CONTOUR INTERVAL 20 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
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
Open-file Geologic Map 90
Geologic map of the Tome quadrangle,
Valencia County, New Mexico.
May 2004
by
Geoffrey Rawling and David J. McCraw
New Mexico Bureau of Geology and Mineral Resources, 801 Leroy Place, Socorro, NM 87801
Grober Fuqua #1
64853
781
Oil & gas exploration well.
Groundwater monitoring, or water supply well (with NMOSE
W.A.T.E.R.S. database reference number)
af
daf
Qrgc2 Qrgm2
Qrg
Qrgc1 Qrgm1
Holocene
Valley Margin
Axial river deposits of the ancestral Rio Grande, undivided — Unit mapped where subdivision by
texture is difficult due to poor outcrop. Consists of small rounded hills and bluffs usually mantled by
gravel, even where gravel does not appear to be the main component of the unit. In general, unit is
dominated by subequal amounts of medium bedded medium to coarse sand and sandy and silty clay, with
subordinate gravel, and is probably QTsas or Qtsasm. A “-c” designation indicates gravel clasts are largely
comprised of conglomerates.
Qae
?
2.6 Ma
Qem
?
?
?
?
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.
Qed
Qbf
Qedo
Axial river deposits of the ancestral Rio Grande — Subequal amounts of sand and silty clay with sparse
gravel. Sand is pink (7.5 YR 7/4) to pinkish gray (7.5 YR 7/2), fine to very fine, well rounded. Bedding is
QTsasm-c generally massive, and contains lenses of blocky and crumbly red to pale green clay up to 1m thick. A “-c”
designation indicates gravel clasts are largely comprised of conglomerates.
Qsu
QTsl
3.6
5.3
11.6
16.0
Tpu
QTsa QTsa-c QTsas
QTsl
QTsasm QTsasm-c
Axial river deposits of the ancestral Rio Grande — Subequal amounts of and gravel and moderately
to poorly sorted cross bedded sand. A “-c” designation indicates gravel clasts are largely comprised of
conglomerates.
QTsasm
Qsu
QTsacs QTsacs-c
COMMENTS TO MAP USERS
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.
Qe
?
Elevation of water table (on cross section)
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.
Qeda
Qay
Axial river deposits of the ancestral Rio Grande — Unit is dominated by medium to coarse, moderately
to poorly sorted, cross bedded sand and subordinate gravel in scoured channels. Contains buried soils
consisting of carbonate nodules, clay accumulations, and rubification. Unit also includes dune sand
composed of white, rounded to subangular, slightly frosted, medium to very coarse quartz sand with
abundant elongate carbonate concretions.
Eolian Deposits
upper
TURN
Magnetic Declination
May 2004
10º 15' East
At Map Center
Historic
11
126
QTsacs-c
Rio Grande
Inner Valley and Other
Location of geologic cross section.
Trace of aeromagnetic lineament inferred to represent trace of buried
fault; data from Sweeney, et al. (2002).
QTsacs
CORRELATION OF MAP UNITS
Horizontal bedding
VEGUITA
QTsa-c
106°37'30"W
Topographic trace of fault scarp.
BELEN
QTsa
351000
Geologic contact. Solid where exposed or known, dashed where
approximately known, dotted where concealed or inferred.
1 MILE
LOS LUNAS SE
TOME NE
Sierra Ladrones Formation (Upper Santa Fe Group, (Lower Pleistocene (?) to Pliocene) — Poorly
lithified axial river deposits composed of sandy gravel, sand, silt, and clay and deposited by the ancestral Rio
Grande. Discontinuously exposed along bluffs of the inner valley of the Rio Grande. Sands are composed
largely of quartz, with lesser amounts of rock fragments and chert. Gravel clasts are up to 10 cm in length
and are composed of at least 50% granite and quartzite. The remainder is dominated by intermediate and
basaltic (often vesicular) volcanic rocks and sparse Pedernal chert. Gravels generally occur in crude fining
upward sequences, often scoured into subjacent unit. Buried soils consisting of horizons of carbonate
nodules, clay accumulations, and rubification are present in both gravels and sands. Matrix in the gravels
is poorly sorted coarse sand. A white, 1-2 m thick stage III+ (IV locally) calcic soil (Machette, 1985;
Birkeland, 1999) is present in the uppermost sand and/or basal dune sand at the top of bluffs, delineated
by northeast-trending hachures on the map where exposed. Thickness: Base not exposed; ~ 45 m exposed
between floodplain and top of inner valley escarpment in the northern portion of the quadrangle.
Three compositionally distinct units can be identified in the north portion of the quadrangle. Nomenclature
after Cather (1997):
EXPLANATION OF MAP SYMBOLS
1
LOS LUNAS
346000
Edith formation or Menaul formation (?) (middle Pleistocene ?) — Ancestral Rio Grande deposits
formed of cobble gravel with coarse sand matrix. Clast composition is similar to QTsa gravels (see below)
but clasts appear to be smaller on average. Base of deposit is 21 to 25 meters above Rio Grande floodplain
deposits (Qrg), similar to the Edith and Menaul formations in the Albuquerque area (Connell, et al., 2000).
Deposit forms scattered, gravel-mantled subcrops on the eastern slope of the Rio Grande inner valley.
Thickness ≤ 10 m.
3833000
34°37'30"N
Base from U.S.Geological Survey 1984, from photographs taken 1976 and field checked in 1976.
Map edited in 1984. Base projected from NAD83 to NAD27
1927 North American datum, UTM projection -- zone 13N
1000- meter Universal Transverse Mercator grid, zone 13, shown in red
DALIES
Qem
Qbf
Qrgm1
Qae
34°37'30"N
?
?
QTsl
?
?
4,000'
?
3,800'
Rio Grande sedimentary deposits and rocks
Qed
af
Qrgc1
Eolian deposits with older dune form development (lower (?) Holocene) — Composition is similar to
Qed. Commonly buried by or reworked into Qed. Thickness < 1 m to 5 m (?).
Qbf
Qrgm1
Qrgc2
?
QTsl
QTsl
Vertical Exaggeration = 10x
Eolian and playa deposits on floors of small blowouts within Qedo (Holocene) — Deposits are
comprised of sand, silty clay, and clay. Thickness ≤ 2 m.
upper
af
Qbf
Qedo
AM
3834000
?
3,800'
Eolian deposits with recent dune form development (Holocene) — Deposits are pink (7.5 YR 7/4),
light brown (7.5YR 6/4) to very pale brown (10YR 7/4) to brownish yellow (10YR 6/6), unconsolidated,
very fine- to medium-grained, moderately well-rounded to well-rounded sand composed largely of quartz.
Contains scattered pebbles. Dunes are less than one meter to several meters in height. In the northern half
of the map area, unit contains local areas of sand sheets (unit Qe). Along bluffs flanking the inner valley
of the Rio Grande unit includes small (<1 m) dunes and sand sheets generally less than 1 m thick. Linear,
barchan, and parabolic dunes are present in the southern and southwestern portions of the quadrangle.
Lateral contacts with Qe and Qedo are often difficult to distinguish, and are locally queried. Thickness <1
to 5 m (?).
middle
Qrg
?
QTsl
Eolian deposits with subdued or no dune forms (Holocene) — Predominantly sand sheets. Deposit
consists of light brown (7.5YR 6/4) to light reddish brown (5YR 6/4), fine to very fine grained, rounded
to subrounded sand composed largely of quartz. Locally pebbly, possibly due bioturbation. Forms a broad
undulating surface with little or no development of drainage incision or dune microtopography around
shrubs. Unit typically has one or more episodes of soil development beneath the surface. Thickness ≤ 2
m.
lower
Qrgc1
QTsl
Active dunes (Historic to Holocene) — Dune field north of Canada de la Loma de Arena. Dunes are
steep sided and up to 4 meters high. Field has active blowouts and less vegetation than adjacent areas.
Thickness 4 to 5 m.
lower
af
Qed
QTsasm
upper
Qrgm1
34°40'0"N
3837000
?
Alluvium and eolian sand sheets, undivided (Holocene to upper Pleistocene) — Generally forms
low relief aprons and arroyo channels along valley margins. Pebbly sand is light brown (5YR 6/4) to
grayish orange (10YR 7/4) to light yellowish brown (10 YR 6/4), unconsolidated, well sorted (eolian) to
moderately or poorly sorted (alluvium), subangular to subrounded, and composed dominantly of quartz.
Interfingers with and overlies Qrg. Thickness ≤ 5 m.
middle
A
3837000
?
Arroyo and valley alluvial deposits (Holocene) —
Consists of variably bedded and stratified cobbles, pebbles,
sand and silt. Pale brown (10YR 6/3) to brown (10YR 5/3). Locally incised up to 2 – 3 m by modern
arroyos floored with recent sand and gravel. Includes local areas of eolian sand sheets less than 1 m thick,
and broad areas of undifferentiated valley fill. Only mapped in large drainages. Thickness ≤ 10 m (?).
Pleistocene
34°40'0"N
Qay
QTsa-c
67300
Qrgc1
AM
QTsasm
Qay
Qrgm1
?
?
4,000'
Alluvial, eolian, and playa deposits
Qrgc1
Qrgm1
Meander-bend deposits (Historic to upper Holocene) —
Deposits preserved along older abandoned meander-bend
courses. Corresponds to units Hcb and Hcs of Pearce and
Kelson (2004).
QTsa Qae
AM
Qrg
?
4,200'
?
?
62691
QTsasm
af
Qrgm1
Pliocene
3839000
QTsasm
af
3839000
QTsasm
Miocene
Qrgm2
Qrgc1
Qsu
?
QTsasm
daf
Qsu
4,200'
QTsa-c
AM
4
Meander-bend deposits (Historic) — Deposits preserved
along recently abandoned and active meander bends.
Corresponds to units Rch35, Rcs35, and Rcb35 of Pearce
and Kelson (2004).
Quaternary
Qrgm1
Qrgm2
Qed
QTsasm
Neogene
Qrgm1
3840000
Tpl
REFERENCES CITED and
REFERENCES PERTINENT to the MAP AREA
Birkeland, P. W., 1999, Soils and Geomorphology: New York, Oxford University Press, 430 p.
Cather, S. M., 1997, Toward a hydrogeologic classification of map units in the Santa Fe Group, Rio
Grande rift, New Mexico: New Mexico Geology, v. 19, p. 15-21.
Connell, S. D., Allen, B. D., Hawley, J. W., and Shroba, R. R., 2000, Geology of Albuquerque West
7.5-minute quadrangle, Bernalillo County, New Mexico: New Mexico Bureau of Geology and
Mineral Resources Open-File Geologic Map OF-GM-17, scale 1:24000.
Connell, S. D., and Jackson, P. B., 1999a, Field logs of boreholes for nested piezometers, Nancy Lopez
site, Valencia County, New Mexico: New Mexico Bureau of Mines and Mineral Resources OpenFile Report OFR-443A, 12 p.
Connell, S. D., and Jackson, P. B., 1999b, Field logs of boreholes for nested piezometers, Tome site,
Valencia County, New Mexico: New Mexico Bureau of Mines and Mineral Resources Open-File
Report OFR-443B, 11 p.
Connell, S. D., and Love, D. W., 2001, Stratigraphy of middle and upper Pleistocene fluvial deposits of
the Rio Grande Valley (Post-Santa Fe Group) and the geomorphic development of the Rio Grande
Valley, northern Albuquerque Basin, central New Mexico: New Mexico Bureau of Geology and
Mineral Resources Open-File Report 454C, 12 p.
Keller, G. R., and Cather, S. M., eds., 1994, Basins of the Rio Grande Rift: Structure, Stratigraphy, and
Tectonic Setting: Geological Society of America Special Paper 291, Boulder, CO, 304 p.
Kelley, V. C., 1977, Geology of Albuquerque Basin: New Mexico Bureau of Mines and Mineral Resources
Memoir 33, 59 p.
Lozinsky, R. P., 1988, Stratigraphy, sedimentology, and sand petrology of the Santa Fe Group and PreSanta Fe Tertiary deposits in the Albuquerque basin, central New Mexico: Ph.D. Dissertation , New
Mexico Institute of Mining and Technology, 298 p.
Lozinsky, R. P., 1994, Cenozoic stratigraphy, sandstone petrology, and depositional history of the
Albuquerque basin, central New Mexico: in: Keller, G. R., and Cather, S. M. (eds.), Basins of
the Rio Grande Rift: Structure, Stratigraphy, and Tectonic Setting: Geological Society of America
Special Paper 291, Boulder, CO, p. 73-82.
Machette, M. N., 1985, Calcic soils of the southwestern United States: in: Weide, D. L. (ed.), Quaternary
soils and geomorphology of the American Southwest: Geological Society of America Special Paper,
Boulder, CO, p. 1-21.
Upper Sierra Ladrones Formation, undivided — Dominantly well-sorted, sandy fluvial deposits with
interbeds of silty and clayey sand formed into upward-fining sequences within an overall coarseningupward sequence. Cross section only. Unit description from well logs in Connell and Jackson (1999a)
and Connell and Jackson (1999b). Thickness: 250 – 265 m in the Nancy Lopez (NMOSE-NL) and Tome
(NMOSE-T1) groundwater monitoring wells.
Maldonado, F., Connell, S. D., Love, D. W., Grauch, V. J. S., Slate, J. L., McIntosh, W. C., Jackson P. B.,
and Byers, F. M., 1999, Neogene geology of the Isleta Reservation and vicinity, Albuquerque Basin,
Central New Mexico: in: Pazzaglia, F. J., and Lucas, S. G., (eds.), Albuquerque Geology: New
Mexico Geological Society Guidebook 50, p. 175-188.
Lower Sierra Ladrones Formation, undivided — Dominantly clayey sand with gravel fine- to mediumgrained sand interbeds. Cross-section only. Thickness: The Nancy Lopez and Tome groundwater monitoring
wells penetrated ~ 100 m of lower Sierra Ladrones Formation but did not encounter the base.
May, S. J., and Russell, L. R., 1994, Thickness of syn-rift Santa Fe Group in the Albuquerque Basin and
its relation to structural style: in: Keller, G. R., and Cather, S. M. (eds.), Basins of the Rio Grande
Rift: Structure, Stratigraphy, and Tectonic Setting: Geological Society of America Special Paper
291, Boulder, CO, p. 113-123.
Popatosa Formation (Middle and Lower Santa Fe Group, middle to upper Miocene) — Light brown
to pink, coarse grained sand with silty sand and clay interbeds, fining downward to fine to medium grained
sand with clay interbeds. This overlies interbedded light reddish brown to red clay, fine sand, and silty
sand. Unit is not exposed in the quadrangle and is only shown on the cross section. Description is from
Lozinsky (1988) based on cuttings from the Grober Fuqua #1 oil test well. Subdivision into upper (Tpu)
and lower (Tpl) subunits is based on an upsection change in lithic fragment composition from volcanic
and sedimentary dominated to metamorphic dominated at 3999 foot depth in the Grober Fuqua #1 well
(Lozinsky, 1988). Upper Popatosa thickens greatly to the west across faults due to rapid Miocene extension
(May and Russell, 1994).
McCraw, D. J., Love, D. W., and Connell, S. D., 2006, Preliminary geology of the Abeytas quadrangle,
Socorro County, New Mexico: New Mexico Bureau of Geology and Mineral Resources Open-File
Geologic Map OF-GM-121, scale 1:24000.
Pearce, J. T. and Kelson, K. I., 2004, Surficial geologic map of the middle Rio Grande valley floodplain,
Isleta Diversion Dam to San Acacia Diversion Dam: New Mexico Bureau of Geology and Mineral
Resources Open-file Report 480, scale 1:48,000.
Tpu
Russell, L. R., and Snelson, S., 1994, Structure and tectonics of the Albuquerque basin segment of the Rio
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