mz USGS U.S. DEPARTMENT OF THE INTERIOR

science fora changing world U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1411-A

Geology and geologic cross sections—PLATE 2

Geldn, 1.2002, Gelony of Peleczoic ors inthe Upper Cola Fiver Basin in
Arizona, Colorado, New Mexico, Utah, and Wyoming, excluding the San Juan Basin

Grand
Canyon

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GEOLOGY VERTICAL EXAGGERATION X 2
GEOLOGIC CROSS SECTIONS

EXPLANATION

Geologic Map Units—Quaternary alluvium and colluvium not shown

Tertiary sedimentary rocks

Tertiary igneous rocks

Mesozoic sedimentary rocks

Permian formations composed of shale, sandstone, chert, carbonate rocks,
evaporites, and phosphorite. Not shown generally in Overthrust Belt
because of scale

Bi

Permian and Pennsylvanian quartz sandstone. Includes minor interbedded
carbonate rocks and shale. Not shown in White River Plateau, Elk
Mountains, Monument Upwarp, and Grand Canyon area because of
scale

Permian and Pennsylvanian formations composed of sandstone, shale,
and interbedded carbonate rocks. Not shown in Wyoming, except in
Rawlins Uplift, because of scale

Eagle Valley Evaporite and Paradox Member of Hermosa Formation—
Bedded evaporites of Pennsylvanian age. Shown only where prominent
outcrops are present

Belden and Molas Formations—Black shale with interbedded carbonate rocks
and minor gypsum overlying a thin red shale regolith. Formations are mostly
Pennsylvanian in age. Shown only where Eagle Valley Evaporite crops out
in northwestern Colorado

Mississippian, Devonian, Ordovician, and Cambrian formations—Composed
of limestone and dolomite with interbedded quartzite, sandstone, and
shale

Precambrian sedimentary rocks and slightly metamorphosed sedimentary
rocks

Precambrian igneous and metamorphic rocks

Geologic Cross Section Units

Sedimentary rocks Igneous rocks

Tertiary volcanic
rocks

7 Tertiary sedimentary

rocks
ig Cretaceous sedimentary EE Tertiary intrusive
Mesozoic rocks rocks
sedimentary
rocks Ls | durassic and Triassic =] Cambrian intrusive
sedimentary rocks rocks
[| Permian and [pes | Precambrian granitic
Pennsylvanian [Le] Pennsylvanian rocks
sedimentary Paradox Member
rocks of Hermosa Formation [bem | Precambrian
metamorphic rocks
[me] Mississippian, Devonian,
Ordovician, and Precambrian
Cambrian sedimentary igneous and
rocks metamorphic rocks
p€s | Precambrian
sedimentary rocks
Line Symbols

Fault—Barbs (in figures 5 and 6) indicate relative directions of movement
Geologic contact—Dashed where approximately located

A—— A' Location of geologic cross section shown on plate 2 and figures 5 and 6

The geologic map was compiled from 1:500,000-scale State geologic maps prepared
by Dane and Bachman (1965), Wilson and others (1969), Tweto (1979), Hintze (1980),
and Love and Christiansen (1985). Geologic cross section A-A' was prepared from
reports by Richmond (1945), Rubey (1973), and Royse and others (1975), and unpub-
lished borehole logs; sections B-B' through H-H' were modified from Hintze (1980) and
Tweto (1980b); section I-I' was prepared mainly from Harshbarger and Repenning
(1954), O'Sullivan and Beikman (1963), Haynes and others (1972), and unpublished
borehole logs. The intersection points of cross sections are not shown here and else-
where in this report. The sections are taken from the work of other authors and thus
represent different interpretations and generalizations. Showing the intersection points
could give the misleading impression that errors were made in drawing one or both of
the intersecting sections.

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

GENERALIZED GEOLOGY OF THE UPPER COLORADO RIVER BASIN AND VICINITY IN ARIZONA, COLORADO, NEW MEXICO, UTAH, AND WYOMING
By
Arthur L. Geldon
2002