NMBGMR Open-file Geologic Map 19
Last Modified 29 November 2010
NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES
A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
QUATERNARY AND TERTIARY SYSTEMS
106°27'30"W
369000
370000
371000
374000
375000
!
!
Qvy
3929 000
QHvaf3
Qvo2
QHvrg
!
QHvra
!
!
!
!
!
!
!
!
QHvra
QTsacs
1
Stream and floodplain alluvium (Holocene) – Unconsolidated fine- to coarse-grained sand,
pebbly sand, silt and clay associated with the floodplain and abandoned channels of the Rio
Grande. Drillers logs (Table 2) indicate that the base of this fluvial sequence is marked by a
coarse gravel between 15 and 30 m beneath the land surface.
QHvra
3927 000
!
QHvaf2
Qvyf
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
Qvyf
!
Qvr3
!
!
x
!
!
!
!
edge of te
!
!
!
!
!
QHvaf2
Qvyf
QHvaf2
!
Stream alluvium (upper Pleistocene) – Poorly consolidated deposits of yellowish-brown
(10YR) pebble conglomerate and pebbly sand derived from the ancestral Rio Grande. Clasts
are generally smaller than unit Qvr1. Unit may be correlative with the alluvium of Menaul
Blvd. in the Albuquerque area to the south. Forms discontinuous exposures east of the inner
valley escarpment of the Rio Grande. The top is about 50 m above the Rio Grande floodplain.
Thickness is generally less than 4 m.
!
!
!
!
Qvr2
!
!
!
Qvr3
!
QTsts
!
!
!
!
!
:
!
!
Tb1
!
!
!
!
QHvra
!
!
!
AM
!
!
QHvaf2
!
!
QHvaf1
:
Tanos fault
!
!
1
!
!
!
l
!
!
!
!
!
!
QHvaf2
QHvaf1
!
!
!
o
!
o
!
!
!
2
!
!
!
!
!
!
!
o
!
l
2
!
!
!
!
!
!
:
!
!
l
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
?
!
!
!
!
!
!
?
?
x
!
!
o
!
!
!
!
2
!
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!
!
!
!
!
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!
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!
!
!
:
l
!
l
!
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!
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!
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!
!
!
l
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
%
(
San Francisco
fault system
Tspcs
!
Tsps
Tsps
V
1
Tspc
QTspcs
!
365000
366000
367000
106°30'0"W
368000
369000
370000
371000
106°27'30"W
372000
374000
4
o
14
Qca, Qcb
QHva, QHvt,
QHvf
35°22'30"N
375000
Tbv1
1:24,000
1
LOMA CRESTON
NEW MEXICO
0.5
1000
SAN
SANTA ANA PUEBLO FELIPE
SAN FELIPE PUEBLO
PUEBLO
PLACITAS
373000
106°25'0"W
Base map from U.S. Geological Survey 1984, from photographs taken 1976, field checked in 1976, edited in 1984.
1927 North American datum, UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
BERNALILLO
middle
l
!
!
!
l
:
:l :
l
!
!
!
!
!
l
!
l
3
!
15
13
l
!
!
!
!!
!
:l
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
3916 000
6
Qpo
QHva
!
!
!
Qpo
1
!
!
o
!
4
l
!
!
!
!
!
!
!
!
!
Va
Vi lley
fau ew
lt
í
!
!
!
!
!
!
!
!
!
!
í
:
o
í
3
QTsps
28
o
Tb2
o
Qpm
5
Tb1
Qvo
o
QTsacs
30
52
o
Qvyf
o
o
Qvy1
4
o
Qvyf
Qpo
o
o
Tspc
!
!
!
o
Qvyf
!
!
!
!
P1.65+-0.43
P1.74+-0.29 5
1.67+-0.04
#
3
QTsts
!
!
V
!
!
o
3
!
Qpm
af
!
0
0
1000
2000
3000
1 MILE
4000
5000
6000
QTspcs(v)
Basaltic colluvium (Holocene through upper Pleistocene) – Poorly consolidated and sorted
breccia composed of angular to subangular basalt boulders derived from mesa-capping basalts
along the margin of Santa Ana Mesa. Unit is a mantle of boulders that forms a transportlimited slope created by a combination of soil creep, rockfall and topple, debris flow, and
landslide.
Axial fluvial deposits consisting of subequal proportions of gravel (pebbles, cobbles) and sand.
Weakly indurated; medium to light gray in color. Gravels are quartzite-dominated and well
rounded; sands are quartzose and commonly crossbedded. Gravel-clast lithologies included
quartzite, chert, granite, sandstone, intermediate volcanics and pumice. Mudstone is minor and
is reddish brown to grayish green in color. Bedding thickness is 0.5 to 4 m.
Light gray sandstone-dominated axial fluvial deposits. Mapped separately only in local area
north of Arroyo de la Vega de los Tanos. Sandstones are weakly indurated and trough crossbedded.
Axial fluvial deposits consisting of subequal sandstone and mudstone with minor conglomerate. Unit occurs locally approximately 1 km east of San Felipe Pueblo. Anamalous mudstone
content may reflect development of sag ponds on hanging wall of Escala fault.
Tspc
Colluvium and alluvium, undivided (Holocene through upper Pleistocene) – Poorly to moderately consolidated sand and gravel. Unit forms relatively thin (<2-m thick) mantle associated
with base of steep slopes. Unit mapped where aerially extensive.
Landslide deposits (upper through middle Pleistocene) – Well consolidated and partially rotated
blocks of gravity-transported basalt and Santa Fe group. Unit is recognized by surface morphology and exhibits a hummocky surface and bowl-shaped closed depressions at the head
(top) of the unit. Unit Qvr and Qvr3 locally overlie landslide blocks. Two distinct generations
of mass movement are recognized by nesting of bowl-shaped heads. Units transported during
slope instability caused by local steepening of slopes during encroachment of the Rio Grande
on the margin of Santa Ana Mesa. Arrows indicate direction of movement.
Geologic map of the
San Felipe Pueblo quadrangle,
Sandoval County, New Mexico
Tbv2
Sandstone-dominated transitional piedmont-axial deposits. Unmappably intercalated reddish
brown to buff piedmont deposits and gray axial fluvial deposits. Conglomerate and mudstone
(Both axial and piedmont) are commonly present but volumetrically subordinate. Bedding
thickness is typically 0.1-1 m.
Sandstone-dominated transitional volcanic-bearing piedmont-axial deposits. Intercalated
piedmont and axial deposits in the north-central part of the quadrangle that contain abundant
Jemez-derived volcanic clasts. Piedmont deposits comprise only a minor component in most
areas.
Eastern piedmont facies consisting of subequal conglomerate and sandstone with minor reddish
brown mudstone. Conglomerate clasts consist mostly of recycled Paleozoic and Mesozoic
sedimentary detritus with subordinate clasts derived from Espinaso volcanics. Conglomerateclast lithologies are similar to QTspc. Sandstones are commonly crossbedded and texturally
and mineralogically submature, and form beds that are tabular in shape 0.3-2 m thick. Moderately indurated.
Sandstone-dominated eastern and western piedmont facies. Conglomerate and mudstone are
commonly present in subordinate amounts. Sandstones are light reddish brown, texturally and
mineralogically submature, and coarse to fine grained. Beds are tabular and 0.1-1.0 m thick.
Moderately to weakly indurated.
Eastern piedmont deposits consisting of subequal sandstone and mudstone. Sandstones are
similar to QTsps. Mudstones are weakly indurated and medium reddish brown. Bedding is 2
cm to 1.5 m thick. Weakly developed calcareous paleosols are common.
Western piedmont deposits (Cochiti Formation) overlying Tb1 on Santa Ana Mesa in north part
of quadrangle. Unit consists of poorly consolidated gravels and sands but is not sufficiently
exposed to allow subdivision into textural lithofacies. Pebbles and cobbles are volcanic
(mostly mafic to intermediate composition) and are subangular to subrounded. Unit ranges
from 0 to 20 m thick.
Lower Santa Fe Group (Miocene(?) – Pliocene(?))
Eastern piedmont facies consisting dominantly of conglomerate with subordinate sandstone.
Clasts are composed predominantly of Paleozoic and Mesozoic sedimentary detritus; Proterozoic lithologies are also well represented, particularly in the southeast part of the quadrangle.
Unit is moderately to well indurated, moderately dipping, and occurs stratigraphically below
the lower Bandelier ash and pumice deposits to the north, and is thus thought to be preQuaternary in age. Volcanic detritus (rcycled Espinaso Formation) is a common but typically
minor constituent. Bedding is channel-form to tabular and typically 0.3-2 m in thickness.
Tspcs
Eastern piedmont facies consisting of sandstone and conglomerate. Conglomerate is similar to
that in Tspc and forms beds 0.5-2.0 m thick. Sandstone is fine to very coarse grained and is
buff to pale reddish brown.
Tsps
Sandstone-dominated deposits at eastern piedmont facies. Buff to light reddish brown fine to
coarse sandstones with subordinate conglomerate and mudstone. Bedding is typically 0.1-1.0
m thick.
Volcanic rocks
3917 000
25
!
QHvaf
86
!
QTspcs
QTsps
4
o
(
!
o
28
QTsacs
Qvo
!
!
2
6
!
!
!
Qvyf
!
!
!
Qpo3
o
Qvm
o
1
o
o
o
Qvyf
«
Qvy
l
o
l
Qvyf
4
o
«
!
Qpo1
!
RG152
o
Tspcs
%o :
QTsts
QTspcs
!
Qvy
e
RG151
RG153
18
13
2
o
af
13
4
Qca
Qvm
3
o
o
o
Qvyf
QHvra
Pleistocene
/
/
l
!
!
!
!
!
!
2
7
QHva
oo
14 QTspcs
9
Tsp
!
!
!
!
!
!
!
!
!
!
ol
V
14
o
o
QHva
o
QTsp
Qcb
Qls
1
QTsts
!
QTsts
QTsp
QTst
Qvo
o
af
X
mine
l
!
!
l
!
!
o
QTsa
Qvm
!
!
!
!
!
!
!
!
!
Old piedmont alluvium, undivided (middle to lower(?) Pleistocene) – Well consolidated ridge
capping gravel on interfluves of Tonque and San Francisco Arroyo systems. Deposit surface is
dissected. Unit thickness is estimated to be less than 10 m.
QTsts(v)
QTsp(v)
Qae
Tbv, Tb
3918 000
4
RWP1
« 1
Old piedmont alluvium (middle to lower Pleistocene) – Moderately consolidated deposits of
yellowish-brown (10YR), poorly sorted, subangular ot subrounded sand and conglomerate.
Surface possesses erosional ridge-and-ravine topography. Surface is locally recognized by
stripped soil exhibiting continuous to discontinuous (broken) carbonate rinds (ste III to IV
carbonate morphology?). Unit is locally divided into three subunits (Qpo3, Qpo2, Qpo1) on
the basis of inset relations along Tonque an San Francisco Arroyos.
QTsts
Eolian and alluvial deposits, undivided (Holocene) – Poorly consolidated fine- to mediumgrained sand and silty sand with scattered pebbles that commonly form a weakly to moderately
developed desert pavement. Unit locally forms relatively thin (<1 m thick) mantle over the
basalts of Santa Ana Mesa (Tb) and other upland areas.
BT
QTst
Qvm
Qvo
Piedmont alluvium (middle Pleistocene) – Moderately consolidated deposits of light- to
strong-brown (7.5YR) and very pale-brown to light-gray (7.5-10YR) sand and gravel. Forms
moderately dissected surface underlain by a moderately well developed soil possessing state
III+ carbonate morphology. Multiple buried calcic (Bk) soils are locally recognized where
inset against piedmont deposits of the Santa Fe Group. Estimated thickness is about 18 m.
QTsts
o
QTsasm
!
x
!
!
!
Qvyf
QHvaf2
o
1
o
2
QTspcs
# 1.43+-0.03
# 1.71+-0.05
Qvy
QHva
3919 000
QHvaf/QHvat
l
!
!
o
Qvm
QHva
QTsacs
l
?
4
ge
QTsp
QTpo
3
!
!
# 2.27+-0.14
o o
l
!
!
!
:
!
!
!
l
!
Escala
fault
!
!
!
!
í
!
x
?
QHva
!
x
í
!
Qvyf
e
l
?
QHvra
2
dra
ina
o
l
o
Qls
1
yo
1
!
!
e
?
af
rro
Qvm
e
e
!
QTsacs
QTsps(v)
oA
QTsasm
QTspsm
!
!
!
1.47+-0.73
#
QTsas
Eolian deposits (Holocene) – Yellowish buff fine to medium sands of eolian origin. Includes
both active and semi-stabilized deposits.
!
!
!
!
!
Qvyf
!
!
QTsacs
Qpo1
Pliocene & Miocene
e
!
!
!
?
í
!
Stream alluvium (middle to lower(?) Pleistocene) – Moderately consolidated deposits poorly
sorted, subangular gravel. The surface is moderately dissected and partially stripped. Unit
occurs as thin (<3-m thick) straths at the heads of upland drainages and thickens to over 18 m
within the valleys of major tributary drainages to the Rio Grande. Unit is locally divided into
older (Qvo1) and (Qvo2) subunits on the basis of stratigraphic (inset) position.
Qe
!
! !
!
x
!
Qls
Qvo1
Qpo2
J
!
!
!
!
!
In areas where intercalated in a manner in which they cannot be separated at a scale of
1:24,000, interfingered piedmont and axial deposits are mapped as transitional deposits (QTsts,
Cather, 1997). QTsts(v) in the north-central part of the quadrangle consists predominantly of
volcanic-bearing axial sands and gravels and subordinate volcaniclastic piedmont deposits.
Artificial fill (Historic) – Dumped fill, excavations, and areas effected by human disturbances.
Mapped where a really extensive (not mapped everywhere on quadrangle).
!
!
!
?
x
!
Stream alluvium (middle Pleistocene) – Moderately consolidated deposits of light-brown to
light yellowish-brown (7.5-10YR) gravel and sand. Unit forms moderately dissected surfaces
underlain by well developed soils with state III to IV carbonate morphology. Estimated thickness is 12 m or greater.
af
!
!
!
x
!
!
!
al T
uert
# P1.57+-0.06
af
5
Fan alluvium, undivided (uppermost Pleistocene through Holocene) – Unit typically has fanshaped morphology in map view. See description of Qvy.
The eastern piedmont system (QTspc, QTspcs, QTsps, QTspsm, Tspc, Tspcs, Tsps) consists
predominantly of recycled sedimentary detritus from Paleozoic and Mesozoic strata. Proterozoic granitic, quartizitic, and metamorphic detritus are also present, in increasing in abundance
in the southeast part of the quadrangle. Volcaniclastic detritus is minor (<10%) and consists of
materials reqorked from the Espinaso Formation. Paleoflow in the eastern piedmont was
generally west or southwest.
Artificial fill, landslide, and colluvial deposits
l
!
!
!
!
!
4
estr
QTsacs
o
!
Qpm
Qpo3
!
!
!
Qvyf
!
QHvaf
«
o
!
!
!
!
o
!
!
!
!
!
M
QTsacs
!
anc
QHvaf/QHvat
!
!
í
Qls
3920 000
:
!
!
Qvm
¥
QTsacs
Stream alluvium, undivided (upper Pleistocene through Holocene) – Poorly consolidated
deposits of light-brown to light yellowish-brown (7.5-10YR) gravel and sand. Unit is inset
against Qvm and possesses broad, very slightly dissected surfaces underlain by weakly developed soils that exhibit state I to II+ carbonate morphology. Clasts are commonly subangular to
subrounded and range up to 2 m in diameter in lower Borrego Arroyo. Unit is associated with
broad valley fill units within large tributary stream valleys. Unit is locally divided into older
(Qvy1) and younger (Qvy2) subunits on the basis of stratigraphic (inset) position. Estimated
thickness is about 12-18 m.
Qvr1
35°25'0"N
!
QHvra
Qvm
QTpo
l
!
!
!
!
!
!
!
«
l
!
!
!
!
QHvra
Qls
Cenozoic
!
!
!
!
Qls
#
2.24+-0.22
RWP4
QHvaf/QHvat
Qvy1
Qvo2
«
af
2
Qae
R633435
«
QTsacs
QHvy2
Qpo
Qls
lower
!
!
í
/
!
!
!
!
o
!
x
í
/
!
!
:
:
x
862
/ /
/
/
!
o
!
í
/
x
!
x x
x
x x
x x
QHvrg
QHvaf
!
QHvra
/
:
!
x x
4
/
!
o
/
!
Qcb
í
/
x x
!
!
!
2
2
QHvaf
Qae
Qvr
!
!
!
!
!
1
l
!
e
!
Qvyf
o
/
l
!
l
!
?
Qae
3921 000
!
!
Qvo
QTspc
Qpm
Basin fill and volcanic rocks
(Santa Fe Group)
af
QHvaf3
QHvaf2
QHvaf1
QHvr2
QTsps(v)
QHvat
RG615108
364000
!
?
4
QHvr3
upper
!
!
2
!
í
QTsacs
Qvm
Miscellaneous
deposits
!
!
!
!
!
!
!
!
l
!
!
QTspsm
Qae/Qpo
!
!
Qae
#1.48+-0.07
QHvra
QHvaf
?
o
3
QTspsm
?
!
!!
l
o
1.50+-0.16
#
2
#1.71+-0.10
Qls
R663271
3922 000
?
Qpo
QTsacs
«
Holocene
l
!
!
!
ol
!
!
!
!
!
!
!
l
?
!
!
!
Qvyf
QHvra
Qls
3916000
l
QTsacs
«
Qvr3
«
3917000
ol
!
!
l
!
Qcb
af
o
!
o
Qvy
2
e
R628954
QHvaf1
8
#
1.64+-0.10
!
Qae
l
R645641
«
3918000
o
!
!
!
!
4
QHvrg
QHvaf
o
o
!
í
Qvy
Qvo
Alluvium of the Valley fill and valley Piedmont-slope
border alluvium
alluvium
Rio Grande
QHvaf
1.67+-0.02
P1.57+-0.11
1.54+-0.01
# #P1.52+-0.09
2
2
2
o
QHvat
The axial fluvial system (QTsacs, QTsas, QTsasm) consists of weakly indurated sand, gravel
and mud of the ancestral Rio Grande. West of the modern Rio Grande gravels contain a
considerable amount of volcanic detritus derived from the Jemez Mountains; east of the river
quartzite predominates. Textrual subdivision of the axial fluvial system is quite approximate
because of poor exposure quality. These units constitute the most implrtant aquifer in the study
area. Paleoflow was generally south or southwest. The axial fluvial system contains numerous
ashes, thepras, and pumice clasts; radioscotopic dates are presented in Table 1. Azial deposits
and associated piedmont deposits in areas to the south are termed the Sierra Ladrones Formation.
Preliminary Map-Unit Correlation: San Felip Pueblo 7.5-minute Quadrangle
Qvy, Qvyf
!
!
!
P1.55+-0.31
#
o
!
x
Qvm
3
3923 000
2
6
Fan alluvium (upper Holocene to historic) – Unconsolidated deposits of predominantly sand,
silt and clast-supported pebble- to cobble-conglomerate. Unit commonly grades to QHva along
valley borders and is divided into two subunits on the basis of inset relations. Typically forms
fans along the base of entrenched tributary stream valleys, but locally includes valley-fill
deposits in canyons upstream from fans. Clast composition reflects upland lithologic sources.
Unit is divided into three subunits (youngest to oldest, QHvaf3, QHvaf2, and QHvaf1) on the
basis of stratigraphic (inset) position.
Complex juxtaposition of poorly to moderately sorted, poorly stratified, clast- and matrixsupported subangular- to subrounded-gravel and sand. Clast composition reflects lithology
exposed in upland drainage basins and are commonly dominated by granite, metamorphic
rocks, and limestone and sandstone.
o
o
QHvaf1
o
:
Tb1
Terrace alluvium (upper Holocene to historic) – Unconsolidated sequences of sand and silt-clay
associated with the floodplain and low-lying terraces within high-order tributary drainages that
grade to the Rio Grande. Unit is gernally less than 1 m above local base level.
Piedmont-slope alluvium
Qvo
l
o
?
o
!
!
o
o o
2
Qvy
Qvo2
!
!
!
Tbv2
í
x
x
x
x
Qvy
Qvo1
P1.18+-0.23
#
Qae
ol
!
2
!
Qls
Qae
Qvm
QHvaf
Qvm
Qvy
í
1
#
P1.61+-0.13
3
!
1
3924 000
1
Qvm
QTsacs
!
!
QHvat
Tb1
Qvy
Qvo
Qvm
!
!
QHvaf2
!
1
The Santa Fe Group consists of axial and piedmont deposits related to deposition within the
Santo Domingo Basin prior to valley incision. For the purposes of mapping, these units were
divided on the basis of textural criteria and dominantly volcaniclastic versus dominantly nonvolcaniclastic nature using the method of Cather (1997), as well as into lower and upper units
on the basis of induration, stratal dip, and geochronology. The San Felipe Pueblo quadrangle
contains deposits representative of three ancint depositional systems. A western piedmont
system (QTsp(g), QTsp(v)) locally crops out west of the Rio Grande and consists largely of
volcaniclastic material derived from the Jemez Mountains to the northwest and lesser amounts
of nonvolcanic material (red granite, quartzite, chert) derived from the Sierra Nacimiento and
San Juan Basin areas to the west. The proportion of non-volcanic material within western
piedmont deposits transitionally increases southward within the quadrangle; only locally in the
north near Borrego Canyon do these deposits consist exclusively of volcaniclastic detritus
(QTsp(v)) and thus may be regarded as Cochiti Formation (sensu Smith and Lavine, 1996).
Qvo
l
!
Qae
Tb2
Tb1
Qvy2
!
Tbv2
Qls
1.77+-0.21#
71
l
!
!
5
!
!
!
!
!
!
!
!
!
!
!
!
o
3919000
%(
!
Tb1
!
Qvy
o
1.40+-0.03 2
#
o
!
!
Qcb
!
l
!
!
!
3920000
!
!
!
!
!
!
Qae
!
!
35°25'0"N
!
!
!
!
!
QTsacs
!
!
S
!
!
Qae
35°27'30"N
!
!
!
l
!
QHvaf1
!
!
QHvaf2
!
!
!
!
Tb1
3921000
!
!
!
!
!
!
!
RWP3
«
QTspsm
l
!
M
3922000
Qvy1
Qvyf
Stream alluvium (middle Pleistocene) – Moderately consolidated and locally weakly indurated
deposits of pale-brown to yellowish-brown (10YR) conglomerate, sand and sandy clay derived
from the ancestral Rio Grande. Clasts are dominated by rounded quartzite cobbles and subordinate tuff, basalt, and granite. Clasts of lower Pleistocene Bandelier Tuff are rare. Deposits
are typically overlain by Qpm and form laterally extensive outcrops along the southeastern
margin of the Rio Grande valley, south of the study area. Unit is probably correlative with the
alluvium of Edith Blvd., a prominent fluvial deposit in the Albuquerque area. The top of this
deposit is about 42 m above the Rio Grande floodplain. Thickness is generally less than 8 m.
Qvr1
!
!
!
x x x
x
x
x
x x x
x
x x
x
x
x x
x x
x
x x
3923000
Qae
!
!
S
!
Tb1
3925 000
!
!
x x x
x x
x
x x x
3924000
«
QHvaf3
RWP5
«
!
!
!
!
QTsacs
!
!
!
!
!
!
QHvra
!
!
!
!
!
QHvaf2
o
!
!
Qcb
RWP7
QHvaf2
!
!
!
!
o
!
Qvo
QHvaf1
!
!
!
x x x x
x x
x
x
x x
x x
!
2
!
!
3
3926 000
o
!
!
!
!
:
l l
!
rrace
Qae
2
QHvrg
!
!
l
!
!
!
Qvy?
o
!
2
l
!
o
Stream alluvium (upper Pleistocene) – Poorly to moderately consolidated deposits of rounded
to subrounded pebble conglomerate and pebbly sand derived from the ancestral Rio Grande.
Clasts are dominated by rounded quartzite pebbles with subordinate tuff, basalt, and granite.
Pumice clasts of the (lower Pleistocene) Bandelier Tuff are rare. Unit forms discontinuous
exposures along western margin of the Rio Grande valley. The base is poorly exposed and is
about 12 m above the floodplain, at the southern margin of the quadrangle, and is buried by
floodplain and fan alluvium to the north.
Qvr3
!
!
QHvaf1
QHvaf/
QHvat
Qvyf
!
!
!
Tbv1
Upper Santa Fe Group (Pliocene(?) – Pleistocene)
!
!
l
!
l
!
35°27'30"N
Stream and piedmont alluvium, undivided (upper Holocene to historic) – Unconsolidated
deposits of brown, light gray-brown, and yellowish-brown (7.5-10YR) sand, sandy clay loam
and gravel. Bouldery alluviumis common along valley borders and adjacent to hillslopes
underlain basaltic colluvium (Qcb). Unit is inset against Qvy and grades to the floodplain of
the Rio Grande. Soils are nonexistent to very weekly developed and exhibit only trace accumulations of pedogenic carbonate. Unit is locally divided into terrace (QHvat) and fan
(QHvaf) deposits on the basis of surface form, clast composition and stratigraphic (inset)
position.
!
!
!
!
!
!
!
!
!
!
x x x x x x
!
Qvo
!
QHva
!
QHvrg
!
!
!
1
QTsts(v)
!
Qca
Stream alluvium (historic) – Unconsolidated sand and gravel associated with the active channel
of the Rio Grande.
QHvrg
Qvo2
!
3925000
Basin-Fill Deposits
QTsacs
!
!
!
Qcb
!
west limit of ax
íí
!
Tbv1
!
!
!
!
!
Tb1
Qe
QHvaf
o
!
3926000
Alluvium of the Rio Grande
!
!
Qvm
l
!
J
Tbv1?
QHvat
3928 000
!
!
?
Qvyf
o
!
Tbv1
!
!
!
!
!
!
rox)
ial facies (app
Qae
l
!
3927000
7
!
!
!
l
!
Tb1
QHvaf2
Qvo2
!
«
x x x x x
x x x
3928000
QTsp(v)
l
Tb1
o
x x x x
RWP2
QHva
Variable proportions of stream and fan alluvium, locally containing debris-flow and colluvial
deposits derived from adjacent slopes and upland areas. Stream- and arrouo-terraces are
associated with major arroyos and streams originating in the Ortiz, Jemez and Sandia Mountains. Alluvial fans typically occur where relatively narrow low-order streams enter wider
valleys. Deposits unconformably overlie basin fill and older rocks, and contain poorly to
moderately stratified alluvium derived from local upland sources. Extrabasinal deposits
contain volcanic and quartzite clasts derived from northern New Mexico. Intrabasinal deposits
are dominated by sandstone, limestone, basalt, porphyritic intrusive, and granitic clasts.
!
:
!
QTsp(v)
Valley-fill and valley-border alluvium
35°30'0"N
2 Qvm
?
!
QTsp(v)
!
Tbv1
373000
!
x
x x x x x
3929000
372000
Qvy
368000
Qvo
367000
!
366000
!
365000
o
364000
35°30'0"N
Valley-floor and valley-border alluvium tributary drainage systems
106°25'0"W
QHvaf
106°30'0"W
Basalt of Santa Ana Mesa (Pliocene) – Tholeiitic flood basalt with modal affinities to alkali
olivine basalt (Kelley and Kudo, 1978, p. 9). Two flows (Tb1, Tb2) are differentiated using
aerial photography, topographic relations, and number of flows exposed along edge of Santa
Ana Mesa. Due to access restrictions, units are simplified and modified from the work of
Kelley and Kudo (1978). Thickness is about 6-12 m along eastern margin of mesa and thickness to over 50 m west of the eastern edge of the mesa (Table 2). Bachman and Mehnert
(1978) reported a K-Ar date of 2.5 0.3 Ma for this sequence of basalts. 40Ar/39Ar dates were
obtained from a basalt flow (1.77 0.21) and a talus block (2.27 0.14 Ma) in sec. 35, T14N,
R4E, and from another talus block in sec. 25, T14N, R4E (2.24 0.22; L. Peters, 1998, written
commun.). Unit includes thin-bedded sequence of reddish-yellow (5YR), fine- to mediumgrained phreatomagmatic deposits consisting of sandstone with interbedded 1- to 2-cm basaltic
tephra. Unit underlies the basalt of Santa Ana Mesa and exhibits of dusky red (10R) color at
the contact. Unit is 1-5 m thick and recognized in discontinuous exposures beneath Tb1 east of
San Felipe Pueblo and along eastern margin of Santa Ana Mesa except in the southern part of
the quadrangle.
Mesozoic System
Jt
Toldito Formation – Light olive gray, laminated, fetid limestone overlain by light gray massive
gypsum. Locally the Todilto is about 65 m thick, although only fault slivers along the San
Francisco fault zone are present in the extreme southeast corner of the quadrangle.
Je
Entrada Sandstone – Yellowish gray eolian sandstones and reddish brown silty sandstones.
Unit is about 40 m thick nearby to the east (Lucas et al., 1995); only fault slivers are present in
the southeast art of the quadrangle.
@c
Chinle Group – Reddish gray to purplish gray to grayish green mudstone and sandstone. Reginally about 300-400 m thick.
Basaltic vent (Pliocene) – Two vent ages (Tbv1, Tbv2) are distinguished on the basis of
relations with flows. Conical-shaped vents rise above laterally extensive, low relief flood
basalts of Santa Ana Mesa. Cones are differentiated by morphologic variations using aerial
photography. The locations of units are modified from the work of Kelley and Kudo (1978).
7000 FEET
May 1998
1
HAGAN
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
Magnetic Declination
July, 2003
10º 17' East
At Map Center
0.5
0
1 KILOMETER
CONTOUR INTERVAL 20 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
by
S.M. Cather and S.D. Connell
New Mexico Bureau of Geology and Mineral Resources
801 Leroy Place, Socorro, NM, 87801
New Mexico Bureau of Geology and Mineral Resources
Northwest
Southeast
Preliminary Geologic Cross Section of the San Felipe Pueblo Quadrangle
A
A'
7000
7000
6000
6000
Open-file Geologic Map 19
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
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.
Tb
Tb
QHvr
Qls
Qvy-Qvr
Tb
Q-ash & BT
5000
5000
?
QTsp
4000
4000
QTsp and QTst
QTst
QTsa
QTsa and QTst
?
3000
3000
?
2000
2000