NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
479000
480000
481000
482000
483000
105°10'0"W
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NMBGMR Open-file Geologic Map 125
Last Modified 08 August 2008
105°7'30"W
488000
489000
A
A
4067000
4067000
12
6
o
Qf
7
o
Qy
o
Tpc
4066000
Tim
9,000
Qy
Xg
& - Tmd
o
8,000
o
o
e
Tpc
11,000
Tpc
Kt
Kpc
Kp
Tim
Qy
Kt
9,000
Tpc
Kt
Tpc
Kpc
Kpc
Tim
Kp
10,000
Cross Section
C - C’
Tpc
7,000
Tpc
Tim
Qy
Tim
M
Qf
feet ASL
Middle Poñil Creek
?
5
5
12,000
Taos Colfax
County County
10,000
6
12
Qcg
Qy
Qy
o
7
12,000
feet ASL
11,000
Qy
4
o
4
Qcg
Tpc
Tim
4
6
Qcg
7
Qy
e e
36°45'0"N
Qy
A’
Ash Mt. Baldy Mt.
7.5’ Quad 7.5’ Quad
¨
Qf
4066000
Tim
o
Kt
Qy
o o
Qy
Xg
o
¨
Qf
o
36°45'0"N
¨
478000
105°12'30"W
¨
105°15'0"W
Kp
Tim
8,000
Kt
Kpc
Kp
7,000
Qyl
4065000
3
o
D
Tibl
4065000
H
o
&-Tmd
o
o
74
o
13,000
feet ASL
Tpc
4
Qy
1
Qyl
Qy
Qy
10,000
H
Tim
C
Qy
Tim
40
Qy
4063000
M
o
o
o
oo o
46
Qy
Qy
Tir
Tpc
2
76
11,000
36°42'30"N
Qy
78
4062000
53
4062000
Tim
Tir
C’
Tim
4
o
56
H
o
o
3
Tpc
oo
Tim
Qy
6
o
5
Tim
5
D
M
D
D
Tir
A'
4060000
D
Tir
o
D
D
D
4059000
D
o
D
Qy
7
D
(
8
D
13
Qo
4058000
Tim
D
Tim
Qy
D
4
Tim
D
Tim
o
4058000
D
o
o
Tpc
5
D
D
3
Tim
"
e
Qy
o
Qy
Qo
Qy
Qt
"
Qt
"
Qt
"
" " TKb
Qs-pc
"
Tim
Tgx
"
"
"
" TKb
o
Tgxx
M
5
M
M
Qt
19
TKb
Kpc
o
480000
12
"
2
o
o o
o o
o
H
Tim
Tim
Qy
Kp
H
B’
22 Qy
17
20
oo
18
26
18
D
ASH MOUNTAIN
482000
483000
1
NEW MEXICO
RED RIVER PASS
EAGLE NEST
BALDY
BALDY MOUNTAIN
MOUNTAIN
TOUCH-ME-NOT
MOUNTAIN
0.5
1000
484000
485000
105°10'0"W
0
0
1000
2000
3000
1 MILE
4000
5000
6000
486000
487000
1
UTE PARK
Tpc
7000 FEET
0.5
0
488000
489000
105°7'30"W
May 2006
NATIONAL GEODETIC VERTICAL DATUM OF 1929
by
2
Charles A. Ferguson and Steven J. Skotnicki .
1
1
QUADRANGLE LOCATION
This draft geologic map is preliminary and will undergo revision. It was produced
from either scans of hand-drafted originals or from digitally drafted original maps
and figures using a wide variety of software, and is currently in cartographic production.
It is being distributed in this draft form as part of the bureau's Open-file map series
(OFGM), due to high demand for current geologic map data in these areas where
STATEMAP quadrangles are located, and it is the bureau's policy to disseminate
geologic data to the public as soon as possible.
After this map has undergone scientific peer review, editing, and final cartographic
production adhering to bureau map standards, it will be released in our Geologic Map
(GM) series. This final version will receive a new GM number and will supercede
this preliminary open-file geologic map.
DRAFT
Slumped mass (Holocene to Pleistocene) – Semi-coherent mass of the unit of Baldy
Mountain, Pierre Shale, and porphyry intrusions.
Correlation of Map Units
1 KILOMETER
CONTOUR INTERVAL 40 FEET
New Mexico Bureau of Geology and Mineral Resources
Arizona Geological Survey
2
Arizona State University, Arizona Geological Survey
Open-file Geologic Map
OFGM 125
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
Landslide deposits (Holocene to Pleistocene) – Disorganized masses of landslide
debris, in both instances consisting mostly of the unit of Baldy Mountain. The areas of
each map unit are characterized by irregular topography including numerous finegrained sediment-filled depressions.
Qs-b,p,i
Qt
Tpc
Alluvium and lacustrine deposits (Holocene to Pleistocene) – Mostly silt and clay
with interbeds of fine-grained to coarse-grained sand and locally granular gypsum.
Deposits fill a series of small lacustrine basins in the northeast corner of the quadrangle.
Slumped mass (Holocene to Pleistocene) – Semi-coherent mass of Poison Canyon
Formation.
Qf
36°37'30"N
COMMENTS TO MAP USERS
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.
H
H
Holocene
Qcg
Qcg
Qy Qyl
Qyl
Qfy
Qy
Qt Qfy
Qt
Qf
Qf
Qo
Qo
Pleistocene
Pliocene
Miocene
Oligocene
Tir
Tib
Tim Tir
Tir Tib
Tib Tibl
Tibl Ttm
Ttm Tfh
Tgxx
Tfh Tg
Tg Tgx
Tgx Tgxx
Tim
Tibl
Eocene
Paleocene
Tfh
Tpc
Tpc
Kt-v
Kvt
Kpc
Kpc
Kp
Kp
Kt
Kt
TKb
TKb
Tg
Lower
Jurassic
Triassic
T-&md
Pennsylvanian ³-Tmd
Neoproterozoic
Mesoproterozoic
Paleoproterozoic
Tgx
Tgxx
Xg
Xg
Xq
Xq
8,000
7,000
Qs-pc
Tim
Geologic map of the Baldy Mountain
quadrangle, Colfax County, New Mexico.
ABREU CANYON
Magnetic Declination
March, 2005
9º 30' East
At Map Center
Qyl
Qo
Tim
"
Tpc
Kpc
Cienega deposits (Holocene) – Long-lived deposits of perpetually wet younger
alluvium in the Valle Vidal. The soil in these areas is black and very loamy.
4053000
105°12'30"W
Kp
TKb
Older alluvium (Pleistocene) – Pebble-cobble alluvium caps two small hills near the
head of Mill Creek in the southwest central part of the map area.
Alluvial fan deposits of Valle Vidal (Pleistocene) – Undifferentiated alluvial fan
deposits. In areas where subcrop is the unit of Mills Divide, very large boulders (up to
2 m) of sillimanite schist, quartzite and felsic porphyry occur.
Ttm
Monzonite (Oligocene) – Fine- to medium-grained monzonite porphyry with subhedral
to euhedral plagioclase phenocrysts up to 3 mm, but mostly less than 2 mm. Mafics are
typically altered, but mostly appear to be hornblende with lesser amounts of biotite and
pyroxene. Locally, miarolitic cavities are present. Dikes of this kind consistently strike
northerly or northeasterly. The dikes intrude and are intruded by the northwest-striking
suite of quartz-feldspar porphyry dikes (Tir). In the southeast (Wilson Mesa), and southwest, the porphyry mostly forms sills.
Quartz-feldspar porphyry (Oligocene) – Strongly porphyritic felsic to intermediate
dikes containing up to 20% 4-15 mm euhedral to subhedral feldspar (mostly potassium
feldspar) phenocrysts with hornblende and sparse biotite. Dikes of this variety, along
with the biotite-red porphyry (Tib) and biotite-lamproite (Tibl) dikes consistently strike
to the northwest. These dikes intrude and are intruded by the north to northeast-striking
monzonite porphyry dikes (Tim).
Biotite-rich intermediate porphyry (Oligocene) – A distinctive subhedral-population
of the northwest-striking suite of dikes containing abundant biotite (5-15% 1-3 mm) and
feldspar phenocrysts up to 6 mm.
Kt
Kt-v
Kpc
Kp
Trinidad Formation (Upper Cretaceous) – Gray to green shale and laminated siltstone
interbedded with thin- to thick-bedded fine-grained, well-sorted quartz sandstone, typically argillaceous. The sandstone beds are parallel laminated to low-angle crossstratified and locally display hummocky cross-stratification. 60 m (200 ft) thick.
Combined Trinidad - Vermejo Formations (Upper Cretaceous) – A unit shown only
on cross-sections. 125-155 m (400-500 ft) thick.
Pierre Shale, calcareous upper zone (Upper Cretaceous) – Black shale with septarian
nodules up to 1 m and sparse, thin- to medium-bedded micritic limestone beds containing molluscan shell debris. 125-155 meters (400-500 feet) thick.
Pierre Shale (Upper Cretaceous) – Black shale undifferentiated. Greater than 600 m
(2,000 ft) thick.
Tertiary and Pennsylvanian
T-&md
Monzonite porphyry of French Henry Camp (Oligocene) – A suite of fat, stubby,
northwest-striking dikes and a lacolith-shaped stock in the vicinity of French Henry
Camp, northeast of Baldy Mountain. Similar to the monzonite porphyry in terms of
mineralogy, containing plagioclase and mostly hornblende, but this porphyry is characteristically porphyritic with 2-10% plagioclase phenocrysts up to 5 mm set in a groundmass that is virtually identical to the monzonite porphyry suite of dikes (Tim).
Granite of Copper Park, fine- to medium-grained (Oligocene) – The outer phase of
a granitic stock centered on Copper Park, just to the north of Baldy Mountain. The phase
is similar mineralogically to the monzonite porphyry (Tim), except that the texture is
more equigranular, the mafic content appears to be lower and it grades inward into a
coarse-grained to megacrystic granite.
Granite of Copper Park, medium- to coarse-grained (Oligocene) – Intermediate
phase of the Copper Park stock containing feldspar phenocrysts ranging in size from 5
mm to 4 cm. Mafics, mostly biotite make up less than 15%.
Hornblende monzonite porphyry of Deep Tunnel Mine (Oligocene) – A suite of sills
in the southwest corner of the map area that contain conspicuous hornblende
phenocrysts up to 1 cm. The hornblende is concentrated in cumulate-like inclusions in
a fine- to medium-grained matrix porphyry that otherwise resembles the monzonite
porphyry suite of dikes and sills (Tim).
Unit of Baldy Mountain (Paleocene - Upper Cretaceous) – A complex unit exposed
only in the vicinity of Baldy Mountain. The unit is typically hornfelsed or strongly
silicified and poorly exposed, forming long talus slopes and large landslide and semicoherent slump deposits. The unit is dominated by fine- to medium-grained, wellsorted, arenaceous quartz sandstone that is typically present in parallel laminated to
low-angle cross-stratified, medium- to thick-beds. The sandstone is also interbedded
with dark silicified argillite and in this regard is very similar and probably equivalent to
the Trinidad Formation. However, the unit also includes several intervals, up to 30 m
thick, of medium- to thick-bedded, clean (non-argillaceous) medium- to coarse-grained
quartz sandstone and pebbly sandstone. Pebbles are mostly light and dark gray chert.
The unit is provisionally given a temporary, informal name due to its poor exposure, the
lack of a well-defined upper contact, and the fact that the unit is several times thicker
than the Trinidad Formation. The unit is at least 250-300 m (800-1,000 ft) thick.
Cretaceous
Biotite lamproite dike (Oligocene) – A single northwest-striking dike (northernmost of
the suite) of coarse-grained biotite lamproite, containing greater than 60% biotite.
Granite of Copper Park, coarse-grained to megacrystic (Oligocene) – Interior phase
of the Copper Park stock containing euhedral to subhedral potassium feldspar
phenocrysts up to 7 cm.
Poison Canyon Formation (Paleocene) – Sandstone, pebbly sandstone, pebble-cobble
conglomerate interbedded with lesser claystone, sparse shale, and rare coal seams. Eastern exposures are equivalent to the Raton Formation (TKr). The sandstone and
conglomerate occur in medium- to thick-bedded, typically cross-stratified and channelized beds commonly amalgamated into sets greater than 20 m thick. Trough and
wedge-planar cross-stratified sets 20-100 cm thick are the most common, but tabularplanar sets are also present. An average paleocurrent azimuth of 083 was determined
from 189 measurements, mostly from foresets. Mudstone interbeds, up to 20 m thick,
are typically massive, where not punctuated by siltstone intervals, poorly organized, and
contain abundant detrital muscovite. Rare dark green and locally dusky red shale intervals are also present. The feldspathic (rarely arkosic) quartz sandstone is poorly- to
moderately-sorted, argillaceous and micaceous. Clasts in the conglomeratic sandstone
and pebble-cobble conglomerate are well-rounded to sub-rounded and dominated by
vein quartz, micaceous quartzite, quartz sandstone, and chert throughout most of the
map area. Towards the west, the maximum grain size increases to 25-30 cm and clasts
of leucogranite, sericitic schist, sillimanite (fibrolite) schist, felsic to intermediate volcanics, and sparse amphibolite. The unit is at least 500 m (1,600 ft) thick.
Tertiary and Cretaceous
Talus and colluvium (Holocene to Pleistocene) – Talus and colluvium-covered slopes.
"
"
9,000
Kt-v
Qcg
Incipient slaty cleavage
Tim
Kpc
Tertiary
2
35
1:24,000
COMANCHE POINT
o
"
Tpc
TKb
Young alluvial fans (Holocene) – Alluvial fans that merge with and/or overlie active
alluvial, valley bottom deposits.
"
15
10,000
Qfy
"
"
12
Tpc
Strike and dip of inclined bedding.
H
"
8
Base map from U.S. Geological Survey 1987, from photographs taken 1981, field checked in 1983, edited in 1987.
1927 North American datum, UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
VAN BREMMER
PARK
"
Tfh
Alluvium (Holocene) – Active and recently active alluvial deposits.
4054000
Qy
Tpc
31
13
12
H
o
26 30
11
12
Kp
Kpc
481000
"
"
479000
"
o
478000
17
Tim
"
15
o
105°15'0"W
o
"
o
C
4053000
Kp
23
Kpc
Tg
Tim
"
"
"
Tpc
Qy
Fault. Certain, approximate, above ground
D’
"
3
"
15
o
Kp
"
o oo
Tim
o
36°37'30"N
"
"
12
71
Qy
Qt
"
"
TKb
Ttm
Qf
10
"
"
o
17
21
" "
"
F
o
o
8
Qls
15
TKb
Qs-b,p,i
Kpc
36
o
"
o
Kp
Kp
40
Tfh
"
"
"
o
o
o
TKb
47
Tfh
oo
Tim
oo
TKb
15
TKb
5
"
11,000
Dike.
Geologic contact. Certain, approximate,
above ground, gradational.
~~~
"
feet ASL
Disturbed areas (Holocene) – Mostly earthen dams.
"
Tgx
Ttm
Ttm
Qt
12,000
H
Limit of interpretation
4055000
o
Tim
4054000
Qy
?
2
15 "
o
Ã
Qt
Tpc
o o
Tgxx
TKb
D
o
Qy
"
TKb
o
¨
o
oo
¨
Kpc
7,000
D’
Quaternary
"
Ttm
8,000
Description of Map Units
Explanation of Cross Section Symbols
"
o
3
Tfh
"
11
4055000
Tim
Kpc
7,000
Qls
Tim
F
Qls
Qf
Tfh
"
18
o
o
Kp
Kp
Kt
D
8,000
Qt
Tim
"
9,000
Joint.
"
Tim
Kpc
Tpc
Tir
Kt
Anticline or syncline.
4056000
7
F
"
Kpc
10,000
o
Ttm
"
Ttm
Kp
F
3
10
"
Kp
3
o
o
Ttm
Geologic contact. Solid where certain, dashed where
approximate, dotted where concealed.
Tectonic foliation. Slaty cleavage in sedimentary rocks,
shape fabric in granite, schistosity in quartzite.
Neogene
"
Ttm
4056000
Ý
Ã
4
"
Quaternary
Kp
Paleozoic
"
11,000
Horizontal bedding.
Phanerozoic
Mesozoic
Cenozoic
Cretaceous Paleogene
Ttm
M
" Qo
M
"
Location of geologic cross section.
4057000
"
Kp
Kp
Qy
Tfh?
D
5
M
"
Qy
Qo
Qo
Tim
D
D
Tib
Tpc
"
F
Tim
o
"
36°40'0"N
¨
o
o
6
Kpc
"
Tpc
Kt
feet ASL
Probable thrust fault which may, in whole or in part, be
depositional and/or a normal fault; barbs in hanging wall.
Solid where certain, dashed where approximate, dotted
where buried.
M
D
Tir
D
(
D
o
D
Tim
"
"
4
Tim
D
12,000
Reverse fault; barbs in hanging wall. Solid where certain, dashed where approximate, dotted where intruded
by younger granite OR buried by younger sedimentary
rocks.
D
o
5
Tim
(
o
Tim
Tir
6
"
(
5
13
"
~~~~~
~~~~~~~~
~
Tir
o
Tir
e o
o
o
o
"
(
(
Tim
4059000
4057000
Kt-v
Kp
Thrust fault; barbs in hanging wall. Solid where certain,
dashed where approximate, dotted where buried.
D
F
Tim
2
18
Kpc
Qy
D
o
Tim
&-Tmd
Tpc
~~~~
~~~
~~~~~~~~~~~
~~~~~~
9,000
7
o
Tim
4
B
~~~~
10,000
Cross Section
C - C’
A
7
Tim
Tir
Tib
Middle Poñil Creek
Tpc
Explanation of Map Symbols
o
Tir
Tir
Qy
Tfh
?
4
36°40'0"N
Cross Section
A - A’
TKb
o
Tib
Tpc
Tfh
9,000
A’
Tir
Tir
feet ASL
11,000
Qy
Kp
13,000
12,000
4061000
7
o
o
8
Qy
8,000
C’
Tim
4
4060000
9,000
7,000
o
Qy
4061000
o
e
Qy
Kp
?
Ttm
8,000
Tim
10,000
Qy
4
Tib
10,000
Ttm
Kp
Ttm
Kpc
11,000
Kp
TKb
Kpc
8,000
5
Tir
Tpc?
Tim
Kp
Mill Creek
Tg
Kpc
12,000
Qt
South Poñil Creek
Tg
Qt
H
o
36°42'30"N
Qfy
Tim
12,000
Cross Section
D - D’
¨
Tpc
?
& - Tmd
?
feet ASL
Tim
57
9,000
13,000
F
Tir
Cross Section
B - B’
¨
o o
Tim
40
4063000
11,000
4064000
Tir
Tir
TKb
Qls
H
Upper
4064000
Tg
TKb
Kpc
12,000
Tim
13,000
feet ASL
TKb
Tim
Xq
B’
Cross Section
C - C’
B
Qfy
7
D
Conglomerate of Mills Divide (Paleocene - Pennsylvanian) – A very poorly exposed
unit composed of cobble-boulder, well-rounded conglomerate and pebbly sandstone.
Clasts of vein quartz, micaceous quartzite, quartz sandstone, silicified argillite, chert,
leucogranite, foliated leucogranite and gniess, sillimanite (fibrolite) schist, sericitic
schist, and porphyritic intermediate to felsic igneous rocks are virtually identical to those
found in the Poison Canyon, but much larger typically 2-3 times. Along the eastern edge
of its outcrop belt, sparse clasts of micaceous, argillaceous, feldspathic quartz sandstone
that strongly resemble the Poison Canyon Formation are present. Outcrops of this unit
are rare, but consist of medium- to thick-bedded pebble-cobble, mostly clast-supported
conglomerate and pebbly sandstone. One paleocurrent (azimuth of 170) was obtained.
The unit is differentiated from the Poison Canyon Formation by dark red soil and maximum clast sizes that are typically greater than 60 cm. Most of the unit probably correlates with the thick, dark red hematite-cemented, coarse-grained, Pennsylvanian
conglomeratic (Sangre de Cristo Formation) units of the area. The presence of clasts
that might have been derived from the Paleocene Poison Canyon Formation in the south,
and a zone of very coarse-grained clasts (greater than 2 m) of quartz sandstone that
strongly resembles the Dakota Sandstone (of Upper Cretaceous age) along the eastern
edge of the outcrop belt in the northerly adjacent Ash Mountain 7.5’ quadrangle,
suggests a more complex origin for this unit. That the conglomerate might also include
zones of younger, possibly Laramide-aged, thrust-front generated, coarse-grained lenses
is a possibility that must be considered. That the thrust fault zone might have been reactivated as a normal fault is also a possibility. At least 200 m (650 ft) thick.
Paleoproterozoic
Xg
Xq
Foliated leucogranite (Paleoproterozoic) – Fine- to medium-grained, foliated,
leucocratic granitoid, locally intruded by undifferentiated amphibolite dikes.
Quartzite (Paleoproterozoic) – Weakly to strongly foliated fine- to coarse-grained
quartzite locally containing segregations of coarse-grained muscovite. Only shown on
cross-section and on the westerly adjacent Red River Pass 7.5’ quadrangle.