USGS

‘science fora changing world

U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1420

Geologic map of the San Juan structural basin—PLATE 1
Craigg, Steven D., 2001, Geologic framework ofthe San Juan structural basin of New
Mexico, Colorado, Arizona, and Utah, with emphasis on Triassic through Tertiary rocks

EXPLANATION
Qal Qds ai Qb
Qal ALLUVIUM QI LANDSLIDE DEPOSITS
Qds DUNE SAND Qb BASALTIC LAVA FLOWS

Ta ALLUVIAL AND LACUSTRINE DEPOSITS
Tb BASALTIC LAVA FLOWS.
Tv VOLCANIC ROCKS—Undivided

Te CHUSKA SANDSTONE.

Tsj SAN JOSE FORMATION
Tn NACIMIENTO FORMATION
Toa OJO ALAMO SANDSTONE,

TKa ANIMAS FORMATION TKi INTRUSIVE VOLCANIC ROCKS

Kkf KIRTLAND SHALE AND FRUITLAND
FORMATION—Undivided

Kmp MENEFEE FORMATION AND POINT
LOOKOUT SANDSTONE—Undivided

Kpe PICTURED CLIFFS SANDSTONE. Kmv MESAVERDE GROUP—Undivided
KI ‘LEWIS SHALE Kec CREVASSE CANYON FORMATION
Kpcl PICTURED CLIFFS SANDSTONE AND Kg GALLUP SANDSTONE

LEWIS SHALE—Undivided

Kch CLIFF HOUSE SANDSTONE Kin
Kd DAKOTA SANDSTONE

Kchl LA VENTANA TONGUE OF THE CLIFF
HOUSE SANDSTONE—Southeastern Kdb DAKOTA SANDSTONE AND BURRO-
part of basin (CANYON FORMATION—Undivided

Kmf MENEFEE FORMATION Kdm DAKOTA SANDSTONE AND LOWER
Kp! POINT LOOKOUT SANDSTONE PART OF MANCOS SHALE—Undivided

Kplh HOSTA TONGUE OF THE POINT Ku CRETACEOUS ROCKS—Undivided
LOOKOUT SANDSTONE—Southern

Part of basin

Jm MORRISON FORMATION Jsr | SAN RAFAEL GROUP—Undivided

Jmwe MORRISON FORMATION, WANAKAH Ju JURASSIC ROCKS—Undivided
FORMATION, AND ENTRADA.
SANDSTONE—Undivided

Jmsr MORRISON FORMATION ,AND SAN
RAFAEL GROUP—Undivided

Jgc GLEN CANYON GROUP—Undivided (includes
‘Wingate Sandstone)

Fe CHINLE FORAMTION us TRIASSIC ROCKS—Undivided

Fd = DOLORES FORMATION

PP PERMIAN AND PENNSYLVANIAN ROCKS—Undivided

MDE€ _ MISSISSIPPIAN, DEVONIAN, AND CAMBRIAN ROCKS—Undivided

p€u PRECAMBRIAN CRYSTALLINE ROCKS—Undivided

CONTACT

FAULT

AAA THRUST FAULT—Sautecth on upper plate

} Holocene
} Pleistocene

Pleistocene
Pliocene

} Miocene
} = Oligocene
} Eocene

\ Paleocene

} Paleocene

\ Upper Cretaceous

> Upper Cretaceous

} Upper Jurassic

} Middle Jurassic

} Lower Jurassic

} Upper Triassic
Middle and
Lower Triassic

} QUATERNARY

} QUATERNARY
and TERTIARY

TERTIARY and
[ CRETACEOUS

r CRETACEOUS

> JURASSIC

> TRIASSIC

PERMIAN and
PENNSYLVANIAN

MISSISSIPPIAN,
DEVONIAN, and

} PRECAMBRIAN

107700"

3705! i

HINSDALE COUNTY

M ____{______ SAN JUAN COUNTY |
LA PLATA COUNTY

[ 4"

&o

wt — UTEMOUNTAIN UTE T é
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BWW RS LO
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37°00" ROKK

ARIZONA

q

SAN JUAN COUNTY

NAVAJO INDIAN
RESERVATION

vy )— CANYON DECHEL

HINSDALE COUNTY r— - ——

MINERAL COUNTY

37°45)

106°30'

‘pyle

NATIONAL MONUM!

Fa COUNTY
| CONEJOS COUNTY

ARCHULETA COUNTY \
RIO ARRIBA COUNTY

37°00"

+30

RIO ARRIBA COUNTY _
SANDOVAL COUNTY

Cap

36°00"

/ JEMEZ INDIAN |
‘RESERVATION

~~ JEMEZ INDIAN

RESERVATION
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Base from U.S. Geological Survey, 1:100,000 Digital Data 36°00"
Universal Transverse Mercator Projection, zone 12
ACOMA ISLETA INDIAN
INDIAN RESERVATION
RESERVATION
cE  . }.»4. LL  _]]__ a= i§f§ ja. ~° |i s)/ 0 S00 | © jig’ ST SSe
0 10 20 30 40 50 MILES
L ! ! L H
i T T T T T sveag: L_ / a
0 10 20 30 40 50 KILOMETERS Leu a Tor 00 70630"

Modified from Dane and Bachman (1965) (New Mexico);
Wilson and others (1969) (Arizona); Tweto (1979) (Colorado);
and Hintze (1981) (Utah)

GEOLOGIC MAP OF THE REGIONAL AQUIFER-SYSTEM ANALYSIS STUDY AREA IN THE SAN JUAN STRUCTURAL BASIN, NEW MEXICO, COLORADO, ARIZONA, AND UTAH