NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCESA DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY
258000
259000
34°0'0"N
260000
107°35'0"W
261000
Qv
3765000
Tsc
Tdr
10
Thm
Tdr
6
Tj
Thm
QTsf
Qv
Qp
Tsc
Qv
Tsc
Tdrt
Tdr
Qtc
40
Tdr
Tdrt
Tdrt
70 60
Qpo
3761000
3762000
Tdr
Tj Tdrt Tdr
13
12
33°57'30"N
Qv
30
Tj
Tj Tj
Tj
Qv
Tj
16
6
8
10
14
12
26
Tdr
7
Tdrt
Tj Tdr
Tj 12
Thm
Thm 8
Tj
15
14
Tj
30
Qv
18
20
Tdbc
Tdbc
22
Tdrh
Tdrt
Tdbc
Tdr
Tdr
Tdrt
3758000
Qp
Tdrt
Tj 45
15
15
Tj
Qp
Qtc
Thm
33 40
Tdr Tdrt
Tdr
Qp Thm Thm
Thm Tj
Qv
12
Tdr
Tdrt
Tdr
45
Qv
Qv
17
30
J
B
Thm
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Qv
Qpo
15
Tj
Tdr
Tj
28
Tdr
3753000
Tdr 10
Tdrt
20
12
Qv
Tsc1
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Tsc1
3752000
Qv
26
Qv
Tdrt
40
Tj 35
37
Tj
Tdr
Thm
23
Tj
Tia
40
30
14 16
Tj
Tdrt
Thm
26
Tid
Tia
30
24
Tj 50
21
Tdrt
Tdr
Tia
Tid
Thm
Thm
50
Thm Tdr
17
32
Tj
Tdrt
Tia
60
Tid
Tlpc
Tia
33
33
Tsc3
18
Tid
47
Tid
Tsc3
12 Tsc4
Tsc4
Tid Tid
16
27
J
16
11
25
24
20
Tid Qv
Qv
14
28
6
13
3755000
12
11
Tsc4
Tsc2
Tsc5 23
Tsc5 20
Tsc4
Tsc5
21
9
Qv Tsc3 Tsc3 8
Tsc1 6
25
22
Tsc3 12
Qv
Tsc4
Tts
Tsc5
3754000
Tsc4
22
Tsc1
Tsc3 Tsc2
Tsc4 18
20
20
Tsc4
Tsc5
14
Tsc4
30
Tsc3
23
Qv
13
25
24
15
Qv
12
15
Tsc4
19
15
Tsc3
14
19
Tsc4
Tsc4
12
20
80
Tsc5 Tsc4
80
Tsc3
10
Tsc4
Tsc4 14 15
Tsc4 13
20
15
Qv
10
24
25
16
21
16
11
Tsc5
20
Tsc4
30
50
Tsc4
Tsc3 8
Tsc3
Tsc4 21
Tsc3
Tsc4
23
Tsc4 Tsc5
33
Qv
Tsc2
3752000
Tsc3 Qca
Tsc3 Tsc1
21
13
25
24
Tsc2
Tsc4
Tsc3
14
31
33
23
Tsc4
10
Qv
Tsc5 Tsc3
Tsc3
Tsc3
Qv
Qv
Qv
Tsc4
3753000
Tsc4 23
Tts
Tsc2
Tsc4
15
Tsc4
Tsc5
17
13
Tsc4 28
Tts
Tsc4
65
25
Tsc4
18
3751000
33°52'30"N
J
C'
257000
258000
107°37'30"W
259000
260000
261000
262000
107°35'0"W
263000
264000
265000
107°32'30"W
266000
Base map from U.S. Geological Survey 1995, from photographs taken 1992. Partial field checked in 1995.
1927 North American datum, UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
1
ARROWHEAD
WELL
OAK PEAK
MONICA
Monica
SADDLE
Saddle
BAY BUCK
PEAKS
0
1 MILE
TRES
MONTOSAS
1000
NEW MEXICO
KELLOG
WELL
0.5
1
MOUNT
WITHINGTON
GRASSY
LOOKOUT
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
0
Magnetic Declination
April, 2010
9º 36' East
At Map Center
1000
2000
0.5
3000
4000
5000
0
6000
7000 FEET
CONTOUR INTERVAL 20 FEET
New Mexico Bureau of Geology and Mineral Resources
New Mexico Tech
801 Leroy Place
Socorro, New Mexico
87801-4796
[575] 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
269000
107°30'0"W
by
G. Robert Osburn and Charles A. Ferguson 2
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).
268000
June 2011
1 KILOMETER
New Mexico Bureau of Geology and Mineral Resources
Open-file Geologic Map 217
267000
Geologic Map of the Monica Saddle
7.5-Minute Quadrangle, Socorro
County, New Mexico
1:24,000
AUGUSTINE
WELL
33°55'0"N
10
Tsc2 6
Tsc3
3756000
Tsc2
20
23
13 7
Tsc4
Tsc4
Tsc1
30
Tsc3
Tsc4 20
Tsc4
Tid
Tsc3
Tsc2
28
20
17
Tsc3
5
3757000
27
1 80
Tid
Tsc1 Tsc3
13
12
45
Tsc4
Tsc1
23 Tsc3 30 Tsc3
18
Tsc3
Tsc1
Tdr
Tsc4
Tsc1
50
Tsc3
Tsc1 Tsc4 20 Tsc1
35
22
20
Tsc4 Tsc4
Tsc4
Tsc3
Tia Tia
19
28
Tsc3
Tsc3
Tts
18
Txc Tdr Tdr Txc
Tsc3
Tsc4
Txc
Tts
10
Tlpc
Tsc1
Tid
16
20
15
Tscu 28
Tsc4
16
27
65
9
30
18
25
Tsc4 24
20
Tsc1
Tsc3
18
20
24
Tlpc Qv
Tsc1
Tlpc
Tsc1
30
Tsc4
Tsc3
Tsc2
Tsc1
10
Tsc2
10
Tsc4
20
Qv Tlpc
Tlpc
Tlpc Tlu
10
Tlu 18
Tlpc Tsc1 20
Tp
5
11
Tll
Tlpc
Tlu
Tsc4
30 34
Tlu
11
Tlu
Tlu
Tsc1
Tp
Tsc4
30
23
Tp
11
Tsc1
Tlu
Tlpc
Tsc1
Tp
Tsc1
Tlu
18
Tlu 12
26
Tsc3 22
24
Tsc1
Tsc1
A
3751000
Tsc3
Tlpc
Thm
30
12
25
Tia
Tlpc
24
Tid
Txc
Tlpc Tsc3
20
Tid Tid 24
41
Qv
Tj
Tdr
Tia
Qt
Tdrt
Tj
61
33°52'30"N
26
21
36
40
26
Thm
Tdrt
24
Tsc1
25
14
27
43
32
80
Qv
Tdr Tll
Tp
Tp Tlpc
Tsc4 Tsc4
Tsc3
Tsc3
Tsc4
Tsc1
Tsc1 Tsc4
Tsc4
Qv
Tsc4
31
Tsc1 Tsc1
Tsc4
31
Tsc4 34
Tsc3
36
Thm
Tsc
Tp
32
Tdr
Tj
Tdrt
Thm
Tdr
15
Tdr
Qv
Tsc2
21
50
12
Tll
Tll
Tll
Tll
Tdr
15
18
13
38 35
Qt
Tlu
Tsc1
Tp
20
12 45
Tj
Thm
Tsc1
15
Tj
Qv
Tlu
3758000
Tlu 8
16
10
Tlu
13
Tdr
20
12
Tlpc
Tlu
Tlpc
22
45
27
Tdert
Tlpc
Tsc1
Tdr 46 Qv 14 12
50
15
Tj
Qv
Tdrt
Tsc1
26
4
6
30
32
21
Tdr
Qv
28 Thm
Qv
24
Tj
18
26
Tdr
Tj 45
32
Tj
13
Tj
50
55
Tdrt 16
Tdrt
Tj
30
26
Thm
Tdr
Tj
Tj
35
Qv
Tj
Tj
45
30
Tdr
Tj
13
26
33
35
Thm
Tlu
Qpo
Tsc1
Tp
15
3759000
10
Tsc1
Tsc1
Tlu 10
Tp
Tlu
18
Qp
Thm
Tj
25
45
Qv
Tdr
14
23
30
23 22
Thm
Tsc1
Tlu
Tll
Tj
28 9
20
10
Tj
Qv
Tdrt
Tj
Thm
Qv
20
Tj
Tdrt
Qv
Tdrt
9
Thm
Tdr
Tdr 24
Qv Tj
Tdr
Qt
Tj
21
17 17
14
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Thm
Thm
3754000
20
10
22
Tj Tdrt 26
Tj
30
Tdr
8
Tdrt
Tdrt
40
Tj
22
Tdr
Tj 23
25
Tdr
21
14
35
Tdr
Tj
Qv
Thm 30
Tj
30
8
Tj
11
Thm
23
Tj 60
25
13
6
10
14
10
30 22
20
30
Thm
15
Tdrt
18
50
Tdrt
Tdrt
Thm
20
Tll
J
Tlu
Tj
30
Qv Thm
Tdrt
Qv
Qv
Tlu
Tlpc Tlpc
B'
Tp
Tp
Tlu 20
Tlu
15
Tp
Tsc
22
Tj
30
3
15
Thm
Tdr
Qp
Tj
15
Thm
Tdr
Qv
Qp
Tsc Tlu 14
Tlu
65
Tlu Tsc Tsc 26
Tll
Tlu
Tlu
22
Tlu
Tlu
Tsc1
Tlu
Tlu
Tlu
Thm
Tdrt
20
Tj
Tdrt
Tlu
Tll
Tll
Tlu
Tll Tlu
Tll
Tll
14
Tdrt
Thm
37
20
30
30
13
34
15
Tj
19
Thm
Thm
11
Tdbc
7
18
Tj 64
Tdbc
Tp
Qv
Qv
Ts
Tj
14
Tdbc 40
50
Ts 40
10 28
Tdrh Tdrh
65
Tdrt
13
35 32
Tp
Tlu Tp
Qp
Tsc 30
Tlu Tll
Tp 22
Tlu
Tlu
Tll Tll
Qp
Tj
70
12
Tll
20
Qtc
Tp
Tdrt
Qv
Thm
Tdrt 36
Qt
8
Tdrh
6
Tdr
Qv
Tj
Tlu
Tll
Qp
Tdrt
3760000
Tll
Tll
C
40
Qv
Tdrt Tj Tdrt
Thm
Tj
Tdrt
Tj
Tj
Tlu
Qp
Qp
Qp
Tdr
15
33°57'30"N
Qp
Tdr
Thm
8
3761000
21
Thm
Qv
J
20
Tj
Tll
Tdr
Tdr
Tdr
Tdrt
14
Tlu Tll
8
25
Tll
Tll
20
Thm
Tll
14
35
6
Tj
3759000
20
Tdr
Tdr
35
Tdrt
Tdr
12
Tll
70
Tj
Thm Thm
3
Tdrt
Tdr
Tdr
30
Tdr
22
24
30
10
Tdr
12
Tj
8
Tdr
45
Tdrt
Qv
Thm
9
12
Qv
Tdr
Tdr
Tdr
Tj
Tdrt
Thm
3760000
Tdr
Tj
Tdr
Qv
32
Tdr
Tdr
Tdr
Qv
15
32
Tdrt
Tdr 70
Tdr
Tdr
Tdrt
Tdr
Tj
30
Tj
30
Tj
40
Tdr
Thm
Tj
Tdrt
Tdrt
Tdrt
Tdrt
Tdr
Tdrt
30
Tj
Tdrt
QTsf
Qv Tj 14
Thm
Tj
Tj
QTsf
Tdr
Tdr
Qca Colluvium and other slope deposits (Quaternary)
Talus and other slope deposits on steep slopes (Quaternary)
Qf Alluvial fan and piedmont deposits (Quaternary) - Deposits are typically incised <5m. clasts are derived from a local source.
30
Qp
Tdr
Qbs Eolian deposits (Quaternary) – Deposits consist of active and vegetated dunes
(fine to medium-grained sand) and silt (loess).
Qtc
45
Tdr
QTsf
Thm
3763000
60
QTsf
QTsf
Qv Active alluvium (Holocene) - Active and recently active alluvium, usually
along stream ways, typically incised <1m.
Qpl Pluvial and lacustrine deposits (Quaternary) – Deposits are fine grained
playa muds and silts locally mantled with eolian sand.
Tdrt
Qv
Qtc
3764000
Qv
Qtc
Tdr
Tdr
Tdrt
Tdrt
Tdrt
Tj
Qv 4
Tj
Thm
Thm
15
Thm 16
Tj
Tdr
Tdr
Thm
af
Man-made deposits (Holocene) – Earthen dams for tanks along active gulleys
or valleys.
Qt Terrace deposits (Holocene to Quaternary) – Remnant areas of alluvium with
flat upper surfaces more than 1m above active drainages.
Qv
Tdr
Thm
3763000
Tsc
Qv
Qp
20
Tdr
Qv
3755000
269000
Qp
45
Qt Qt
Qp
Tsc
Qp
Qv Tdrt
Qp
MONICA SADDLE UNIT DESCRIPTIONS
107°30'0"W
268000
34°0'0"N
Qv Tsc 5
Qp
Qp
Qp
33°55'0"N
267000
4
Qp
Qp
3764000
3756000
266000
Qv
Qv
Qp
Tdrt
265000
3765000
Tsc
Qv
3757000
107°32'30"W
264000
Qp
Qv
3762000
263000
A'
Qv
Qp
262000
J
107°37'30"W
257000
NMBGMR Open-file Geologic Map 217
Last Modified 28 June 2011
1
Earth and Planetary Science Department, Washington University, St. Louis, MO, 63130
2
119 North Fork Road, Centennial, WY, 82055
1
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.
Ted East Red dacite (Miocene – Oligocene) – dark purple dacite intrusions containing 5 to 20 percent large plagioclase phenocrysts. Occurs as discrete dikes and
small stocks within the South Canyon Tuff exposures in southeastern third of the
quadrangle
Tsc South Canyon Tuff (Oligocene) – Rhyolitic ash-flow tuff containing 4-30%
phenocrysts of plagioclase, sanidine, quartz, and biotite. Lithic-lapilli are generally <5%,
and pumice lapilli 5-25%. Thickness: 0 - >1000m. Phenocryst content in South Canyon
is zoned from about ~5 % at the base increasing abruptly to 30% in the upper parts.
Mapped as Tscl and Tscu respectively in outflow exposures where thickness and exposure
permit. Within the caldera (SE part this quadrangle) five subdivisions are sometimes
mapped. Tsc1- 4 -10% phenocrysts of sanidine and quartz in sub equal amounts , Tsc210-15% phenocrysts of sanidine and quartz usually with abundant lithic fragments, Tsc315-30% phenocrysts of sanidine, quartz and minor plagioclase and biotite, Tsc4- 30-40%
phenocrysts similar to Tsc3 but containing noticeable amounts dark-red, quartz-poor pumice (plagioclase, biotite and hornblende), Tsc5 – 30-40% phenocrysts of feldspar biotite
and hornblende, no quartz.
Tlpc Basalt to basaltic andesite (Oligocene) – Vesicular basalt and basaltic andesite
lavas containing < 10% phenocrysts of plagioclase, olivine, and pyroxene. Occurs between rhyolite of Durfee Canyon and tuff of Caronita Canyon, between tuff of Caronita
Canyon and Lemitar Tuff and above Lemitar Tuff.
Tir Rhyolite dikes- Rhyolite dikes similar in mineralogy to rhyolite of Durfee Canyon.
Tvp Vicks Peak Tuff (Oligocene) – Densely welded rhyolitic ash-flow tuff containing 1-15% phenocrysts, chiefly sanidine up to 4mm, lesser plagioclase up to 2mm, and
sparse pyroxene, hornblende, and biotite <2mm. The tuff contains 2-25% strongly flattened pumice lapilli up to 1m long, and sparse <10cm lithic lapilli. The tuff is typically
light gray and the pumice lapilli are commonly recessive on weathered surfaces. Thickness: up to 150m.
Tj
La Jencia Tuff (Oligocene) – Densely welded rhyolitic ash-flow tuff containing
2-10% phenocrysts of sanidine (1-4mm) and plagioclase (1-2mm), and minor biotite,
pyroxene, and hornblende, and quartz. The tuff is generally light to dark gray and contains 5-15% strongly flattened pumice lapilli up to 1m long, and up to 5% lithic lapilli.
Thickness: up to 120m.
Tia mafic dikes – rhyolite dikes and sills within southwestern third of quadrangle.
Stratigraphic position is unclear.
Tll/Tlu Lemitar Tuff (Oligocene)- Densely welded rhyolite to rhyodacite ash flow tuff
containing 10-35% phenocrysts and 5-25% pumice lapilli. Unit is complexly zoned from
phenocryst-poor rhyolite (10-15%) in lower parts (Tll) to crystal rich rhyodacite to rhyolite (25-35%) in upper (Tlu). Upper member consists of a lower dk-red rhyodacite (20-35
% plagioclase, sanidine, and biotite) which grades upward into a phenocryst-rich rhyolite
(30-35% sanidine, plagioclase, quartz, and biotite).
Thm Hells Mesa Tuff (Oligocene) – Densely welded phenocryst-rich rhyolitic to
trachytic ash-flow tuff containing 20-35% phenocrysts of plagioclase (<3mm), sanidine
(<3mm), quartz (<4mm), hornblende (<2mm), and biotite (<2mm). The tuff is reddish
brown to orange in color and contains sparse lithic lapilli and generally <10% pumice
lapilli <10cm long. Thickness: Up to 400m.
Txc Caronita Canyon (tuff of) - Rhyolite to rhyodacite ash flow tuff (10-35%) , Crystal-poor (biotite, plagioclase) lower member; crystal-rich (sanidine, quartz, plagioclase,
biotite) upper member.
Tdbc Blue Canyon Tuff (Oligocene) – Moderately phenocryst-rich ash-flow tuff containing 10-20% 1-4mm plagioclase phenocrysts, and abundant 1-3mm biotite. Thickness: Up to 150m.
Tar Rhyolite of Durfee Canyon - Rhyolite lavas containing 2-8% phenocrysts,
chiefly sanidine up to 5 mm. Occasionally contains secondary pseudobrookite and bixbyite in gas cavities. Lava often underlain by tuffs, and minor flow breccias, and volcanoclastic sedimentary rocks (Tdrt).
Tdrh Rock House Canyon Tuff (Oligocene) – Phenocryst-poor mafic lava contains
less than 5% < 3mm feldspar phenocrysts, and a trace of mafics. Thickness: Up to
150m.