UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY

@ BULLETIN 1007 PLATE 6

Siltstone, sandstone,

OLIGOCENE(?)|

=
a a § Formation and
BIE 3 oe Glececior of ton
ala
= Chalky-white, medium- to coarse-grained, pert
tuffaceous, sandetone on Diamoedl Mownain,” end
Bishop conglomerate | 200-800 to the west, light-tan boulder conglomerate in
imatria of sourse-gralnad sand; Del of chetgye
gle ‘hte talfaoeoun sandglone near the base
g|s UNconronmiry
i g ‘Tam, red, and drab sendy siltowene, fine-grained
# andetone, tod ecogloerate imerbeadel, mre

i 0-2,000 | cludes equivalents ofthe Uinta, Green River,
id conglomerate and Duchesne River formations of the Uinta
Basin
UNcoNFoRMITY
Light-gray to brown fine- to medium-grained sand-
Upper member 600 | stone and dark-gray to light brownish-gray
ignite shale
z Light-gray, thick-bedded to massive, fine- to
| eae 500 | medlumgrained sandatone and medium grained
3 H light-gray speckled sandstone
Q 2
Medium to dark-gray massive siltstone and clay
i Troe sate 4,000 | “Shale with thin losticula beds of tan neous
tandy limestone
Bie] |g Massive to thick-bedded, in part crosmbedded,
8/8 g| Frontier sandstone | 145 215 ‘medium-grained, gray to tan sandstone
= 2 member ‘above and dark-gray, tan-weathering sandy
i i hale below
Mowry shale 0-120 | Dark-gray, hard, fissile, light-gray weatnering
Tmember hale; locally nonfaaile at base

Dakota sandstone

WER AND UPPER
CRETACEOUS

95-135

Light-gray to tan, medium- to coarse-grained
‘sandstone, brownish-gray shale, and inter-
bedded thin, fine-grained, light-gray sandstone

UNCONFORMITY

Morrison formation

Light-gray, very Tine grained sandstone,
variegated mudstone and shale, fine- to medium-
grained sandstone, and thin lenticular beds of
coarse-grained pebbly sandstone

MESOZOIC

Curtis formation

|— unconrormity

150-270

Greenish-gray, medium- to coarse-grained
glauconitic sandstone at the base, overlain
by soft greenish-gray shale, which contains
thin intercalations of fine-grained calcareous
sandstone and hard oolitic sandy Limestone

JURASSIC

Entrada sandstone

105-215

‘Fine- to medium-grained, light-gray, friable
sandstone interbedded to the west with light-
gray to red, very fine grained sandstone
and siltstone

San Rafael group

Carmel formation

‘MIDDLE
Ea UPPER JURASSIC

125-390

Soft, red sandy shale, fine-grained sandstone,
thin beds of platy, light-gray calcareous
mudstone and fossiliferous light-gray

Navajo sandstone

JURASSIC( ?)}

720-1, 030

Light-gray to buff, fine- to medium-grained
‘crossbedded sandstone

Chinle formation

Red, purple, and brown fine-grained sandstone,
‘and red shale overlain by fine-grained, light-
gray to weak yellowish-orange sandstone with
thin partings of weak-red shale

UPPER

Shinarump conglomerate
UNCONFORMITY

Light-gray,medium- to coarse-grained, in part
conglomeratic, sandstone

TRIASSIC

Moenkopi formation

LOWER
TRIASSIC| TRIASSIC

820-1, 120

‘Thin-bedded reddish-brown siltstone and fine-
grained sandstone with partings of weak red
sandy shale and thin beds of light greenish-
gray, fine-grained sandstone

Park City formation

PERMIAN

UNCONFORMITY

70-195

Light gray-green to olive-green phosphatic
shale and phosphate rock overlain by slabby~
weathering light-gray cherty limestone,
dolomite and limy sandstone, and light-gray
shale

Weber sandstone

1, 015-1, 275

ive fine- to medium-grained, light-gray
slightly calcareous sandstone

‘Morgan formation

1, 030-1, 450

Light- to dark-gray, fine- to coarse-grained,

grained, tan to red sandstone and thin inter-
beds of light-gray to pink, medium- to coarse-
grained limestone

PALEOZOIC

Black shale unit

CARBONIFEROUS

Dark-gray to black highly organic shale with thin
beds of greenish sandstone, tan sandy limestone.
and black fossiliferous limestone

MISSISSIPPIAN| PENNSYLVANIAN

Limestone unit
UNCONFORMITY

965-1, 220

Light- to dark-gray, fine- to medium-grained
cherty limestone and dolomitic limestone

Lodore formation

UPPER(?)
\CAMBRIAN|

UNCONFORMITY

0-155

Site ageh, setene grained, massive
to thick-bedded and cross-laminated, arkosic
‘sandstone

Undivided

PRE-CAMBRIAN |CAMBRIAN|
Uinta Mountain group|

3, 000-4, 000

‘Tan to dark-gray or greenish-gray sandy shale
underlain by light-tan to dull-red, thick-
bedded

quartzite in Browns Park in northwestern
Colorado

GENERAL SECTION OF ROCK FORMATION IN AREAS
BETWEEN UINTA RIVER AND BRUSH CREEK

295163 O - 55 (In pocket) No. 6