eZ USGS U.S. DEPARTMENT OF THE INTERIOR

science for a changing world U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1411-A

Precambrian and Mesozoic rocks—PLATE 4

Geldon, A.L., 2002, Geology of Paleozoic rocks in the Upper Colorado River Basin in
Arizona; Colorado, New Mexico, Utah, and Wyoming, excluding the San Juan Basin

J d Kemmerer

Fontenelle
Reservoir

AREA EXCLUDED FROM STUDY

1:2,000,000

25. 50 15
1 1 |

a I

oo

T I T
50 75 100 KILOMETERS

PRECAMBRIAN ROCKS

BOUNDARY OF
UPPER COLORADO
RIVER BASIN

7 107°

Information used to compile this map
was obtained from geologic maps by
Wilson and others (1969), Tweto (1979;
1980a, p. 38-39), Hintze (1980), and Love
and Christiansen (1985); stratigraphic
columns in Hintze (1973); measured
surface stratigraphic sections from reports
cited in the Selected References section,
and unpublished borehole logs prepared
by the American Stratigraphic Company

41°
WOODSIDE

HIN
FORMATIDN D
Monticello MEMBER OF
DOLORES
FORMATION

BOUNDARY OF
UPPER COLORADO
RIVER BASIN

4 } : :
Q XINARUMIP

= MEMBER OF (
© FORMATION,

a je}

Zs

AREA EXCLUDED FROM STUDY

ior
— "36°

C_. .» 7109° J
\ Sf Map based mainly on reports
ao by Stewart and others (1972a,

1972b) and Love and others
(1993) and on unpublished
borehole logs prepared by the
American Stratigraphic Company

1:2,000,000

25 50 75 100 MILES
i 1 J

T T T T
25 50 75 100 KILOMETERS

o—-o

MESOZOIC ROCKS

EXPLANATION

Precambrian rocks

ar Sedimentary rocks and low-grade metamorphic rocks—Includes the Uinta
Mountain, Unkar, and Chuar Groups, Uncompahgre Formation, and unnamed
rocks in the Defiance Plateau-Four Corners area

,>.,| Granitic rocks and related intrusives

(al Metamorphosed sedimentary rocks—Includes gneiss, schist, quartzite, and
marble

Ea] Metamorphosed volcanic rocks—Includes greenstone, amphibolite, and
meta-tuff

° Borehole with lithologic log used to prepare map

+ Measured surface stratigraphic section used to prepare map

Mesozoic and Paleozoic rocks

Entrada and Wingate Sandstones— | Sinbad and Timpoweap
Tan, white, gray, pink, and red, Members of Moenkopi
locally conglomeratic sandstone Formation—Gray, yellow,
orange, and green limestone,

Triassic dolomite, siltstone, and
sandstone
Lower Member of Dolores
Formation; Gartra, Mossback, an Dinwoody Formation—Green
and Shinarump Members of and gray shale and limestone
Chinle Formation—Yellow, tan, with anhydrite
gray, and orange sandstone and
conglomerate with siltstone =a Goose Egg and State Bridge
Formations (upper part)—
Hoskinnini and Tenderfoot Mostly red and brown,
Members of Moenkopi locally green siltstone and
Formation—Red and brown claystone with thin sandstone,
sandstone, conglomerate, and anhydrite, and carbonate
siltstone layers
| Church Rock, red siltstone, and Mesozoic rocks eroded or not
Petrified Forest Members of deposited—Paleozoic rocks
Chinle Formation; lower slope- overlain by Tertiary Wasatch
forming and lower red members Formation
of Moenkopi Formation; and
Woodside Shale—Generally red, |<!’ "| Mesozoic and Paleozoic rocks
locally gray, green, or variegated thrust beneath Precambrian
claystone and siltstone, with thin rocks or area in which
sandstone layers Mesozoic and Paleozoic rocks
are missing because of erosion
ax Ledge-forming member of or nondeposition
Moenkopi Formation—Red,
brown, and gray fine-grained Area where Paleozoic rocks
sandstone and siltstone crop out

Base from U.S. Geological Survey
U.S. base map, 1:2,500,000

PRECAMBRIAN AND MESOZOIC ROCKS IN CONTACT WITH PALEOZOIC ROCKS OF THE UPPER COLORADO RIVER BASIN IN ARIZONA, COLORADO, NEW MEXICO, UTAH, AND WYOMING,

EXCLUDING PARTS OF THE SAN JUAN BASIN
By
Arthur L. Geldon
2002