NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
NMBGMR Open-file Geologic Map 30
Last Modified 26 October 2009
DESCRIPTION OF MAP UNITS
Tgl
Quaternary
106°00'00"W
35°30'00"N
411000
410000m E
105°57'30"
412000
QTa
8
Ts
?
Qca
Qa
Qp
3928000m N
Qp
?
QTa
A
418000
Ts
419000
Qca
QTa
Qa
Qca
Qca
Qt
Qca
QTa
@
?
Qa
Ts
QTa
88
76
Te
19
3927000
21
33
QTa
QTa
?
16
C
Tgu
23
Qca
Qca
Qp
21
QTa
Qca
Tgl
25
QTa
QTa
Qp
32
Te 14
12
36
8
38
14
14
15
14
Te
15
QTa
Qa
Te
16
14
Tgu
29
29
Qca
Qca
Te
Tgl
Qp
Qca
Tgl
3923000
Tgu
23
34
29
Tgl
42
Te
Te
46
Tgu
Qca
Qp
QTa
16
8
Te
17
22 13 Tgl
15
Te
17
Te
17
Te
Tgu
Qca
32
Tgl
15
Tgl
65
22
Kn2
Te
22
26
22
Te
14
Qp
21
3
35°25'
12
36
9
14
16
26
Td
64 62
75 50
24
3918000
26
69
39
24
88
38
29
Td
68
10
Qca
Td
Td
64
45
12
Qc
Qc
35
Tgu
Qa
24
76
21
Td
78
13
15
Kcj
7
13
13
Tdt
17
16
1-35
14
13
Qt
12
Tgl
12
17
Qt
Kcj
14
Kns
18
15
18
Qa
7
Qt
Qt
13
Qca
Qt
Qt
Qt
Qa
1-4
Qca
39
4
52
Qca
56
50
Qca
Qa
33
3915000
Qca
18
Tdt
Qca
Tdt
Qca
35°22'30"N
106°00'00"W
26
Kns
Qca
20
10
5
11
Qca
Qa
52
Tdt
10
25
Qt
18
Qt
7
Kdo 8
Kc
33
10
Kn1
Qca
4
60
Kns
33
17
Kcs
Qa
Qt
Kn2
Kc
Qca
414000
105°57'30"
Kc
26
Kg
Kn1
Kcj
412000
10
Qc
415000
6
Kn1
Kgr
Kcj
Kcs
10
Kcj
Qt
Qt
Qc
Qc
Kns
Qt
Km
416000
Qt
Qt
Qc
Kcj
Qt
Qt
Qt
Kcj
Kc
Qt
Qt
417000
1:24,000
SALITRE CANYON
BUFFALO SPRINGS
1
GALLEGOS NE
NEW MEXICO
ALAMOSA CANYON
MEDINA MESA
GALLEGOS
Galisteo
0.5
1000
0
1000
0
2000
3000
1 MILE
4000
5000
6000
7000 FEET
FUENTES RANCH
1
HAMPTON RANCH MONTESITO CREEK
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
May, 2002
13º 0' East
At Map Center
0.5
0
23
3
Kc
418000
NATIONAL GEODETIC VERTICAL DATUM OF 1929
[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
40
\
en
ar
ip
-2,000'
p
ap
-4,000'
QTa
QTa
Te
Te
Qca
Qca
Qp
Qca
16
Qt
Kcj
Kdp Qca
6
Kg
Jm
0' MSL
Kdo
Kdo
419000
Qt
Kn1
?
?
Kc-Kg-Kgr-Kdp
Kd
4,000'
&m/&s
?
Jm
?
?
Mp
Je/Jt
Pb/Psa/Pg
2,000'
@c
Py
Pb/Psa/Pg
@c
Kd
0' MSL
Py
@c
Pb/Psa/Pg
Py
Mp
Py
&m/&s
\
Mp
-4,000'
Qca
&m/&s
May 1999
by
Alvis L. Lisenbee
South Dakota School of Mines and Technology,
501 E. Saint Joseph Street, Rapid City, SD 57701-3995
\
Pennsylvanian (?),
Laramide, and
Rio Grande rift deformation
\
-6,000'
-6,000'
Los Angeles
fault
C
North
QTa
2-4
6,000
Feet (ASL)
Te
Qca
Qca
Lamy
fault
Kd
Tgl
Tdt
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.
0' MSL
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.
-4,000'
Kd
Kd
Jm
Tdt
Je/Jt
Je/Jt
Jm
Thickness determined
from TransOcean
McKee #1 well
Py
@c
Py
Py
-2,000'
Pb/Psa/Pg
2,000'
Py
&m/&s
&m/&s
\
0' MSL
&m/
&s
Mp
Mp
Mp
@c
&m/&s
Mp
Pb/Psa/Pg
Py
Py
Pb/Psa/Pg
4,000'
Py
@c
Kd
6,000
Feet (ASL)
Pb/Psa/
Pg
Py
@c
Mp
Jm
Kd
Je/Jt
@c
Pb/Psa/Pg
@c
Jm
Pb/Psa/Pg
Je/Jt
@c
Kn1
Kc-Kg-Kgr-Kdp
Je/Jt
@c
Jm
Kc-Kg-Kgr-Kdp
Jm
Jm
Qca
Kns
Kd
Kns
Kc-Kg-Kgr-Kdp
@c
Kn1
Kn1
Kn1
Je/Jt
Kc-Kg-Kgr-Kdp
Tdt
Je/Jt
Kn2
Kns
Td
Tdt
Kns
Jm
Qca
Qca
Qca
Kn1
Kc-Kg-Kgr-Kdp
2,000'
C΄
South
Kc-Kg-Kgr-Kdp
Tgu
Minimum thickness
determined from
Pelto #1 Ortiz well
Lamy
monocline
Qca
Te
Tgl
4,000'
Qca
Kc-Kg-Kgr-Kdp
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.
-4,000'
\
35°22'30"N
105°52'30"W
Preliminary geologic map of the
Galisteo quadrangle,
Santa Fe County, New Mexico.
-2,000'
Mp
Pb/Psa/Pg
3915000m N
\
&m/&s
-2,000'
Qca
420000m E
Py
&m/&s
3916000
8 Jm
Jm
6,000'
Je/Jt
Kdo
Jm
?
Pb/Psa/Pg
@c
Jm
Kc-Kg-Kgr-Kdp
?
Kns
Je/Jt
Kd
@c
Km
Kn2
Kn1
Jm
Kc-Kg-KgrKdp
Tdt
Qa
Qca
Qca
Qca
Tdt
Kc-Kg-Kgr-Kdp
Kd
Tgl
@c
8
8
5
Qa
Qp
Tdt
Tgu
Tgu
2,000'
Kgr
12
RD-3
Je/Jt
Jm
75
18
20
RD-4
8,000
Feet (ASL)
Glorieta Mesa
boundary fault
Lamy fault/
Lamy monocline
4,000'
COMMENTS TO MAP USERS
New Mexico Bureau of Geology and Mineral Resources
New Mexico Tech
801 Leroy Place
Socorro, New Mexico
87801-4796
\
Mp
B΄
6,000'
Open-file Geologic Map 30
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).
&m/&s
8,000
Feet (ASL)
Tgl
New Mexico Bureau of Geology and Mineral Resources
0'
South
1 KILOMETER
CONTOUR INTERVAL 20 FEET
Py
td
Mp
Base map from U.S. Geological Survey 1966, from photographs taken 1958, field checked in 1964, edited in 1966.
Polyconic porjection, 1927 North American datum,
Projected to 1927 North American datum, UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
Thickness determined from Trans-Ocean McKee #1. Thickness differences
inferred across the fault illustrate Pennsylvanian-age syn-tectonic deposition
(after Booth, 1977) for Lamy-Canoncito area.
North
Kdo
Qca
Kcj
Qt
Qt
Kc
Kc
105°55'
Mp
Tdt
Qca
Kc
61
Qca
Kcs?
18
72
Qt
Kn2
Qca
Tdt
9
411000
410000
Qt
29 12
20
Kn2
Kn1
Qt
Mp
18
Qca
Qca
Qa
Qa
Qa
Tdt
2,000'
Pb/Psa/Pg
Laramide-age fault may have
lesser dip than reactivated Rio
Grande rift fault
Kgr J
Kcj
Qt
Qc
Qt
&m/&s
3917000
Kdp
Qa
3916000
@c
-2,000'
C'
Kn1
Qca
Qca
Qa
P&sc
@c
Kns
8
4,000'
Py
Je/Jt
Tgl
@c
Qc
Kcj
Pb/Psa/Pg
Jm
Kd
Je/Jt
Py
6,000'
@c
o
A'
Kns
Qt
Qca
Kc-Kg-Kgr-Kdp
Qc
Kcs
Kcj
Qt
Qp
Kn1
2,000'
2-4
Kcs
Qca
26
Kn1
Kgr
Qa
Td
-4,000'
Qa
Kc
Qt
many small faults
Whigham
Davis-Pinon
8,000
Feet (ASL)
Glorieta Mesa
boundary fault
B
15
Kn2
A΄
3919000
10
Qc
Red-orange, dark brown, purplish gray and green, thick bedded mudstone, buff to dark red brown, cross bedded sandstone and limestone
pebble conglomerate. Incomplete section exposed along western margin of Glorieta Mesa. Thickness in subsurface approximately 1850
ft.
@c
Kns
&m/&s
@c
Kcs
Qca
McKee #1
12
Kcj
Kn2
11 13
12
Jm
Thickness from Booth (1977)
Location and plunge direction of petrified log
3918000
Kc
CHINLE GROUP
Qca
6
Kcj
Triassic Rocks
Kn2
Tdt
\
18
20
Kc
Entrada Formation — Rose, buff, and white, cross-bedded, quartz arenite. Extremely friable. Thickness approximately 100 ft in Ojo
Hedionda quadrangle to south. Only the upper few feet are exposed in quadrangle.
OD-1
Tdt
35°25'
18
Qca
15
Kcj
Kcj
Kns
23 21
16
Strike and dip of flow foliation
Kns
12
17
Je
Kn1
Kcj
Kn2
Tdt
20
Strike and dip of bedding
8
@c
Kc
Kc
RD-3
0'
25
21
Qp
RD-2
6
12
Kc
Kc
Kc-Kg-Kgr-Kdp
4,000'
Well drill hole
Qp
Kc
Kn2
Tdt
24
3920000
6
Kns
Kc
Kcj
13
Qc
8
55
36
14
47 11
Qc
12
22
30
68 65
18
Todilto Formation — Light grayish-brown limestone: laminated and crenulated with fetid odor on fresh surface. Overlain by thin
bedded, dark-gray limestone containing red jasper nodules. Thickness 40-50 ft (Booth 1977).
Lamy fault/
Lamy monocline
@c
Conglomeratic zones
12
38
55
Qca
Kc
14
65 13
Jt
Fairport Shale Member — Calcareous shale, bentonite, and minor limestone with concretions. Not exposed in quadrangle but
approximately 188 ft thick in Ojo Hedionda Quadrangle to south.
Trace of axial plane of monocline, dashed where approximately
known, dotted where concealed, plunging if arrow at the end of line
shows direction of plunge.
Qa
43
61
18
65
10 30
Kn2
Qp
Kc
Kcj
18
Qp
5
Kn1
26
Qca
Kn2
5
24
3921000
16
Qp
13
68
5
Kcj
Kns
Qca
77
18
Kns 6
12
Kc
Semilla Sandstone Member — Fine- to very fine-grained, thin bedded, bedding-parallel, bioturbated quartz arenite and interbedded
shale. Three to 10 ft thick. Generally poorly exposed. Contains abundant fossils including Prionocyclus hyatti, Carota dalli, and Pinna
Kaufmani.
Pb/Psa/Pg
Trace of axial plane of syncline, dashed where approximately
known, dotted where concealed, plunging if arrow at the end of line
shows direction of plunge.
26
Qp
Qca
Qa
12
Kn1
8
Kcs
Kd
Trace of axial plane of anticline, dashed where approximately
known, dotted where concealed, plunging if arrow at the end of line
shows direction of plunge.
12
12
5
Blue Hill Member — Dark-gray shale. Three zones of septarian concretions (3 ft) weather to rubble: Enclosing shale rarely exposed.
Thickness ~160 ft. Fossils include Ptychodus whipplei and Cretolamna appendiculata.
6,000'
Dip of fault or dike
3
34
Location of geologic cross section.
Normal fault, ball-and-bar on downthrown side. Solid where
exposed, dashed where approximately known, dotted where
concealed.
@c
10
61
66
Kns
Kn1
83
3922000
81
Kn1
10
Kcb
QTa
Geologic contact. Solid where exposed or known, dashed where
approximately known, dotted where concealed or inferred.
7
Qa
Qca
Td
Td
21
15
Tdt
9
Tdt
9
7
Kns
17
Kn2
A'
13
25
Td
14
17
Kns
14
Kns
12
12
Kn1
6
10
10
Kns
13
89
75
4
Td
12
19
16
Kn2
14
Td
77
7
Pinon
No. 2
SAN RAPHAEL GROUP
Juana Lopez Member — Regression R-1 of Molenaar (1983). Brown-gray platy, interbedded fossiliferous quartz arenite, calcarenite
(commonly composed of needle-like fragments of Inoceramus shells), calcareous gray shale and gray shale. Ratio of carbonate to
sand varies greatly along strike. Forms low ridges. Abundantly fossiliferous with Lopha lugubris, Prionocyclus hyatti, Cretolamna
appendiculata, Prionocyclus novimexicanus, Scaphites whitfieldi, and Inoceramus perplexus. The later three fossils indicate an early
Late Turonian age. Thickness ~65 ft.
Sangre de Cristo uplift
EXPLANATION OF MAP SYMBOLS
11
@c
Td
Td
Kn2
Kn1
Qca
Qt
Td
84
77
73
77
26.5
19
Qca
Qca
Qca
85
57 Tdt
23
26
80
75
75
1-34
17
3917000
88 67
72 76
Qca
23
13
21
Qa
Td
Qa
Td
Td
32
78
Tdt
22
Kns
Qca
Td
80
14
Qca
38 28
22
13
Thin shale — Approximately 50 ft of calcareous Carlisle shale lies above the Juana Lopez Member, although the latter is the mapping
top for this study.
South
8,000
Feet (ASL)
28
Kns
Kn2
17
13
18
Pinon
No. 1
Morrison Formation — Upper portion of the section is white, kaolin-bearing sandstone (Jackpile) underlain by green, gray and maroon
mudstone, interbedded tan and light red-brown sandstone, and lenses of tan and white pebble conglomerate. Sandstone is fine grained,
subangular to subrounded quartz and minor chert and feldspar. Bedding is platy to massive and cross beds are common. Thickness
undetermined.
Jm
North
3923000
8
35
Qc
5
Jurassic Rocks
A
5
5
Unconformity
Lower shale member — Montezuma Shale Member of Mancos Shale. Medium gray, calcareous shale; weathers olive-brown. Poorly
exposed, mostly in arroyos. Thickness approximately 250 ft based on cross section.
GEOLOGIC CROSS SECTIONS
Qca
4
Dakota Sandstone (Romeroville, Cubero and Oak Creek Members, undivided) — In southeastern portion of quadrangle lower and
upper, tan to orange-brown, fine- to medium-grained, medium- to thick-bedded, bioturbated, including scolithus, quartz arenite: middle
portion consists of sandstone and variegated siltstone or, locally, gray shale and highly carbonaceous black shale interbedded with thin
lenses of tan sandstone, commonly containing fragments of coal: thickness approximately 49 ft in southeast. In Lamy area thickness
varies from 1 to 20 ft of thin-bedded, fine-grained, bioturbated quartz arenite.
Kdo
Map units exposed only in cross sections are omitted due to space limitations, but are described in the accompanying report. References
cited are found in the report as well.
Kn2
Kn1
Kns
Sandstone member — Cano Tongue of Stearns (1953). Combined Hosta-Dalton Member, Mulatto Tongue, and El Vado Sandstone of
the Mancos Shale, based upon fossil identification of Varriale (2003). Regression R-3 of Molenaar (1983). Light olive-gray, even bedded,
fine-grained, thin-bedded, bioturbated, ripple marked, calcareous quartz arenite and interbedded yellowish-gray siltstone. Weathers to
a low, broad, rounded ridge covered by sandstone chips. Thickness approximately 400 ft in cross section. Placenticeras guadalupae
(Roemer), P. pseudocostatum (Johnson), P. planum (Hyatt), Turitella aff, Codellana, Gyrodes conradi, Deussinia novamexicana,
Ptchodus mortoni.
4
12
8
Td
27
Qt
Td
Tgl
60
14
Qca
43
43
Td
Qt2
Qca
Kn1
Kns
Kn2
Qca
9
9
Qt
12
1-26
18
68
Kn1
Qp
35
45
A
78
14
Kns
Qca
Qca
29
72
74
Qca
29
27 Tgu
33
Tgu
Qc
Qa
11
83
Kc
Graneros Shale (Clay Mesa Shale Member) — Light gray and black, silty shale, limestone, quartz arenite lenses, numerous bentonite
layers, and large limestone (to 3 ft) and cone-in-cone concretions. A zone of calcareous concretions to 12 ft diameter is present in the
basal portion. Weathers to grass-covered prairie. Abundant fossils include Acanthoceras amphibolum (Morrow), Tarrantoceras sellardsi
(Adkins), Cretoxyrhina mantelli (Agassiz), Cretodus semiplicatus (Munster), Squalicoras curvatus, Squalicoras falcatus (Agassiz) and
Ptychodus occidentalis (Leidy). Thickness 83 ft at Lamy (Lucas, 2002) and Hub Canyon in Ojo Hedionda Quadrangle.
Kgr
Carlisle Shale — In ascending order the unit contains: The Fairport Shale Member; the Semilla Sandstone member; the Blue Hill Shale
Member; the Juana Lopez member; a thin shale. Shale units are dark gray to black, thinly laminated, and weather to a yellow-brown
color.
Kcj
Galisteo Formation, upper unit — Tan to white, massively bedded, friable, well sorted, cross bedded sandstone and interbeds of red,
rose, tan, and gray-green mudstone. Contains silicified logs to four ft diameter and 30 ft lengths. Thickness 346 ft in uranium drill hole
#2-4 and 425 ft in drill hole 1-35.
Qca
4
11
Espinaso Volcanics — Buff, grayish purple and reddish brown beds of agglomerate, tuff, and volcaniclastic sandstone of intermediate
composition and of alluvial fan and laharic origin. Source areas are the Cerrillos Hills and Ortiz Mountains intrusive centers. Conformable
with underlying Galisteo Formation. Comprises approximately 1000 ft maximum thickness in quadrangle.
Kn1
Dakota Sandstone (Paguate Sandstone Member) — Buff to kakhi, bioturbated, fine to medium grained, thin bedded quartz arenite
with three or less bentonite beds. Alternations of gray and brown shale and sandstone give outcrops in arroyos banded appearance.
Fossils include Acanthoceras amphibolum, Tarrantoceras sellardsi, Turrilites acutus americanus, Aphrodina cf. A. munda (Stephenson),
Ostrea beloiti (Logan) and Inoceramus rutherfordi (Warren). Forms low questa. Thickness 17 to 40 feet in the Lamy area and 23 feet
in the southeast. Transitional lower contact with Clay Mesa Shale Member.
Kdp
Upper shale member — Satan Tongue of the Mancos Shale. Medium gray, calcareous shale; weathers olive-brown. Contains abundant
concretions to three feet diameter: Gradational to the Point Lookout Sandstone. Poorly exposed, mostly in arroyos. Contains Cordiceramus
muilleri, Crassatella pluchella, Cladoceramus undulatoplicatus. The thickness, based on cross section, is approximately 300 ft.
@c 4
Qt
Qt
Galisteo Dike (micro-monzonite) — Dark gray fine grained, salt and pepper mixture of plagioclase, potassium feldspar, titan-augite,
titaniferous biotite, apatite, and opaque grains in a glass groundmass. Weathers dark brown or grayish brown and stands as wall-like
rampart. The dike, in map view, comprises many right echelon overlapping segments varying from 200-1200 ft in length and up to 18
ft thick. 26.55 Ma. (Erslev, 2001).
Kcf
Qa
11
Sill/laccolith — Latite porphyry. Dark purplish-brown, porphyritic mixture of plagioclase, potassium feldspar, titaniferous augite,
titaniferous biotite, apatite, and magnetite in a glassy groundmass. Weathers dark brown. Thickness unknown. 32.5+/-1.1 Ma (Peters,
2001).
12
Qca
Kns
Kns
Qca
Qa
Qca
Tertiary Igneous Rocks
35°27'30"
Qc
8
Tdt
Tdt
35
Tdt
Qt
22
Qa
26
Tgu
Td
30
11 9
Qca
Qca
20
47
43
Qa
15
6
Qca
Qc
62
Qp
Qp
18
Tdt
Qc
Tgu
Qt
Qca
Kn2
Late Paleocene to Eocene
8
Qp
Qa
Niobrara Formation — Comprised of upper (Kn2) and lower (Kn1) shale units and an intervening sandstone/sandy-shale (Kns).
Fossils defined by Varriale (2003).
Tertiary Sedimentary Rocks
50
Qp
41 27
Qa
65
86
21
11
Qc
45
26
Qc
57
Qca
Qp
16
Qp
15
36
41
Kns
Tdt
Qc
Qc
25
27
55
65
3925000
Qt
Kn2
60
62
18
Tdt
80
Qt
35
24
19
27
Tdt
10
Te
Kns
37
12
31
12
Qp
Qa
50
36
20
Te
17
27
45
Tgu
12
16
Te
Qca
OD-1
Qp
38
19
20
Qca
11
16
3919000
38
Tgu
36
QTac
Kns
49
Qp
49 74
68
Kns
23
Qc
8
Tgl
77 40
13
Kns
42
Kn1
Qc
60
Te
Qt
Kn1
57
51
60
QTac
QTac
10 6
39
4
Qp
7
10
QTac
Tdt
Td
@c
23
Qt
Ancha or Tesuque channel — Calcite cemented (20% to 95%) arkose or arkosic limestone overlain by medium to very coarse grained
arkosic sand and red silt. Contains numerous rod-shaped zones of caliche-cemented arkose, probably formed by precipitation from
groundwater.
B'
Qt
Qp
47
Tdt
68
Qc
Qp
Qp
16
31
45
16
16
7
Qt
16
Qca
Kn1
Kn1
Kc
Tdt
Kn2
12
Kdo
28
Qt
MANCOS GROUP
23
38
Tdt
Ts
Kpl
Tdt
Qt
3926000
59
28
39
Qls
15
12
Qp
44
9
Qca
30
32
52
38
Kg
Kcj
Qp
19
21
17
13
3920000
6
Te Qca
30
37
Tgu
21
Kgr
Qc
Qca
32
Tgl
Qp
30
13
Qt
10
39
Kc
Tdt
47 24
36
29
Tdt
Unconformity
Unconformity
Graneros Shale (Whitewater Arroyo Shale Member) — Tan, gray, and black, calcareous shale and thin lenses of fine-grained,
calcareously cemented, tan and brown sandstone. Weathers to grass-covered prairie. Thickness 40 to 80 ft in Lamy area and 108 ft in
southeast corner of quadrangle where the Two Wells is absent.
Kgr
Point Lookout Sandstone — Buff and dark brown to olive, fine- to medium- grained, massive bedded sandstone and fossiliferous
brown mudstone containing calcite-cemented concretions. Truncated thickness ranges from 0-60 ft beneath angular unconformity. The
lower contact is gradational with the upper Mancos Shale (Satan Tongue).
Oligocene
Kn2
Qt
MESAVERDE GROUP
Kpl
12
Qca
36
Qt
Tdt
Qa
Kc
Kc
21
Kdo
10
Qt
Qca
Kn2
58
22
Kns
2
Tdt
22
Qca
Qt
QTac
Qt
Dakota Sandstone (Twowells Member) — Tan quartz arenite, medium to course-grained with quartz and chert. Shell fragments
and vertical burrows. Medium to thick bedded, some with cross beds. Twenty four feet thick at Lamy. Absent in southern portion of
quadrangle.
Cretaceous Rocks
Ancha Formation — Buff to moderate orange pink and grayish pink, generally poorly sorted and poorly consolidated beds of sand,
gravel and cobbles. Derived from Precambrian granitic and metamorphic and Paleozoic sedimentary terrains in the Sangre de Cristo
Mountains. Strongly cemented by caliche near Lamy. Thickness to 18 m (60 ft).
33
Tdt
Kn1
49
Kc
Kgr
88
36
28 12
Qt
Kn1
41 84
18
Qt
Kns
52
Tgl
Kn1
15
y
a
Kc
27
Kc
Tdt
50
Tgl
Qca
26
20
37
L
am
F
3927000
Graneros Shale (Lincoln and Hartland Members?) — Tan, gray, and black, calcareous shale and thin lenses of fine-grained,
calcareously cemented, tan and brown sandstone. Alternations of gray and brown shale and sandstone give outcrops in arroyos banded
appearance. Thickness 66 ft at Lamy.
Kgr
Kdt
Divided into two formations. The thickness decreases northward due to regional erosion surface.
Qca
Kns
Kn2
45
Qt 79
60
16
Kgh
Kdo
67
Kgr
Kgr
8
Kc
Kcj Kc Kcj
18
Qca
9
10
Qa
Tgl
Kdo
22
27
Qp
Tgl
23
24
Tgl
Kns
Tdt
Qca
Kc
Kc
60
Tdt
Qa
Qc
Qa
Kgr
The Dakota Sandstone and Graneros Shale are intertonguing units. The Dakota Sandstone is divisible into three sandstone tongues
(Two Wells, Paguate, and the combined Cubrero, Oak Canyon, and Romeroville) separated by the Clay Mesa and Whitewater Arroyo
members (Lucas et al., 1998; Lucas, 2000).
Unconformity
Km
Kdp
37
Kc
Qt
Qa
Tdt
19
36
22 12
38
34 26
Tdt
Qc
Kgr
Kdt
Kg
Qc
Qp
30
Kc
Kdt
Qt
Qp
Qca
Kc
Kgr
Kg
36
QTa
45
Greenhorn Limestone (Bridgeport Limestone Member) — Alternating beds of dark-gray, argillaceous micrite and medium- to darkgray calcareous shale. Most beds are less than 1.5 ft thick. Weathers light-gray and forms a low ridge. Imprints of Inoceramus labiatus
are common as are foraminifera. Thickness is approximately 50 ft.
Kg
Diamond Tail Formation — Variegated sandstone, conglomerate, mudstone and local limestone beds. Sandstone beds are massive,
friable, usually cross bedded and composed of medium- to coarse-grained, subrounded, poorly sorted quartz and lesser chert. Kaolin,
limonite, or calcite commonly constitute the matrix. Colors are tan, brown, orange, pink, red and white. Mudstones are gray to red in
color and poorly exposed. A thin, basal conglomeratic zone containing brightly colored chert is commonly present. At Lamy the section
in dominantly sandstone: Stone from a quarry on the south side of Cerro Colorado was used to construct St. Michaels Cathedral in Santa
Fe. Maximum thickness approximately 1000 ft.
Unconformity
Kns
8
t
ul
18
Tgl
Qa
18
Qp
Kgr
46
RD-3
Qp
52
57
Tgl
14
34
Qca
21
18
QTa
11
85
38
25
Qp
Tgl
Qp
8
7
Kg
12
3921000
10
8
Tgl
Qca
Tgl
14
Tgl
Tgl
RD-4
8
14
Tgl
Qca
16
12
21
5
Tgl
Qp
Qp
Qca
13
17
17
31
33
Kdt
Kg
Kgr Kg
RD-1
7
8
Tgl
Tgl
Pediment deposits — Cobble, pebble, sand and silt deposits lying upon remnants of an extensive surface cut to a former channel level
of Galisteo Creek. Thickness generally less that 10 ft.
37
Kdt
Kdp
Kg
61
8
Tgl
23
65
Tgl
Tgl
12
Qp
QTa
Tgu
3922000
18
17
Tgl
8
14
20
59
Kgr
17
Tdt 55
14
Qp
12
Qa
65
Kdo
24
Qp
Qp
Tdt
18
Tgl
Qp
Kdp
15
Qca
Tgl
Kc
Kg
RD-2
Qp
10
32
30
17
29
42 41
Kgr
Kdt
Tdt
10
QTa
Qp
19
Tgl
8
16
Jm
Kdo
Qp
Kdp
Tdt
Tgl
Tgl
28
Kdo
Kdo
Jm
54
Qca
Kdo
Jm
28
Qp
Qp
12
35
26
Kdo
Kgr
Qp
Jm 30
2
17
14
18
6
21
7
Qca
Qp
18
Qp
Tgl
16
9
Qca 34
24
2
Tgl
Tgl
17
Qa
Tdt
19
9
Tgl
Te 20
18
Qa
Qp
Jm
17
Qp
19
15
Qp
Jm
23
44
Kdp
Kgr
Qls
19
Qca
Jm
Qp
Qca
Kdp
Qp
4
Kgr
QTa Jm
15
19
Qp
Qp
Jm
Jm
Qca
12
Tgl
Kgr
Kdp
Qca
17
Kdo
Kgr
17
Qp
17
15
7
Qp
55
21 5
29
13
Qca
14 8
Kgr
Qca
Tgl
6
32
Jm
Qca
10
Qca
Qp
14
Kgr
26
Tgl
Te
Qca
Qp
Kdo
Tgl
16
34
Tgl
22
24 18
9
Jm
Qp
36
16
Jm
Qp
55
22
Qca
35°27'30"
21
16
Jm
Tgl
QTa
13
15
28 13
34
Qca
34
Qca
3925000
Tdt
16
Jm
10
Kgr
Qp
QTa
2-4
B
Qp
65
29
Te
QTa
71
38
Tgu
36
15
Kgr
Jm
34
Qp
Terrace gravel — Rounded pebbles and cobbles of Precambrian granite, commonly containing abundant epidote, granite pegmatite,
muscovite and biotite schist, and Phanerozoic chert and sandstone in a sand or silt matrix. Terraces generally lie 20 to 40 ft above valley
floors.
Qp
Qca
14
29
Jm
Jm
33
49
16
Kdo
30
Qp
19
15
12
25
15
38
36
12
14
36
81
37
16
Jt
Qp
Qca
Qp
Jm
16 18
6
QTa
15
15
37
Qp
Qp
Tgl
12
12
Jm
Qca
Qp
49 46
20
Qp
Qa
Qp
3926000
Qca
13
Qp
27 8
Qp
Tgu
?
Qp
40
37
1-35
Te
14
12
Tgl
Te
Qp
15
Jm
19
Tdt
Colluvium/alluvium — Sand, silt and clay in abandoned stream channels, flood plains, and lower valley slopes.
Colluvium — Unconsolidated sand, silt and clay deposits along upper hill slopes or broad, flat hill crests. A few meters in maximum
thickness.
Jt
Je
Jm
Jm
31
@
Jt
Je
Je
Qa
Ts
7
32
QTa
?
?
Qca
Te
Je
Jt
Alluvium — Cobbles, sand, silt, and clay transported by seasonal flooding or in active channels. Coarser clasts are dominated by quartz
and granitic material.
Qc
QTa
Qp
Qca
3928000
QTa
Qa
7
Qca
Qa
Ts
13
Qa
QTa
Qa
Qa
Qca
105°52'30"W
35°30'00"N
420000
Qa
Qca
Ts 32.5
Qca
?
Qp
?
Qa
Ts
105°55'
416000
Qca
?
?
Qa
415000
QTa
Qca
?
QTa
414000
Galisteo Formation, lower unit — Alternating pink- to red-colored beds of arkosic sandstone, siltstone, and mudstone with extensive
lenses of conglomerate. The conglomerate beds contain rounded cobbles and pebbles of Precambrian granite and schist and Paleozoic
sedimentary rocks in which the relative percentage of Precambrian clasts increases upward through the section. Thickness approximately
3,500 ft.
Mp
&m/&s
\
-2,000'
&m/&s
\
Py
Pb/Psa/Pg
&m/&s
Mp
\
Mp
\
&m/&s
-4,000'
\
-6,000'
Mp
\
-6,000'
Td