UNITED STATES DEPARTMENT OF

THE INTERIOR

GEOLOGICAL SURVEY BULLETIN 1046 PLATE 49
o Thickness ee
System | Group| Formation Member (feet) Character and distribution
|— Unconformity:
Jurassic Nueail Sandstone, white to pale-yellowish-orange!, fine- to medium-grained, large-scale
and 2 cher am 0-1,350 cross-laminations. Thickens westward from featheredge in northeasternmost
Jurassie(?) z bc Arizona.
8 Sandstone, yellowish-orange and pale-grayish-red, fine- to medium-grained, thin
Turassie(?)|  @ | Kayenta Bere to thick horizontal beds, and medium-scale low-angle cross-laminations;
= | formation contains minor reddish-brown siltstone. Thickens westward from featheredge
= in northeasternmost Arizona.
5
Oo Wingate 250-350 | Sandstone, very-pale-orange to moderate-reddish-orange, very fine to fine-grained,
sandstone large-scale cross-laminations, cliff-forming, widespread.
[Local unconformity
Chirels Rock Siltstone, pale-reddish-brown and light-brown, thin to very thick horizontal
ee 0-350 beds; contains some very fine grained cross-stratified sandstone beds; slope
forming. Thins westward to a featheredge.
Siltstone, pale-red and pale-reddish-brown, thin to very thick horizontal beds;
Owl Rock interstratified with pale-red and light-greenish-gray dense limestone; slope
member 0-450 forming. Grades and interfingers northward and eastward into the Church
Rock member.
Petrified Forest! 9.799 | Claystone and clayey sandstone, variegated, bentonitic, horizontally bedded, a
member few cross-stratified lenses forms badlands. Thins northward to a featheredge.
Chinle Sandstone, yellowish-gray and very-pale-orange, fine; to medium-grained,small-
formation | Moss Back ee to medium-scale cross-laminations; commonly contains thin to thick beds of
member i conglomeratic sandstone or conglomerate; locally highly variable in thickness;
Triassic locally absent.
: Claystone and clayey sandstone, greenish-gray and minor pale-reddish-brown,
micoies BEvte || g’a56 bentonitic, structureless or locally cross-stratified or contorted; contains lenses
 naciaeadl of ripple laminated sandstone; forms badlands. Thins northward toa featheredge.
G Sandstone, grayish-orange to pale-yellowish-orange, medium- to coarse-grained,
Shinarump small- to medium-scale cross-laminations; commonly contains thin to very
mem 0-225 thick beds of conglomeratic sandstone or conglomerate; locally highly
variable in thickness; locally absent.
Templ Siltstone, mottled purple and white, structureless; complex interfingering with
pte light-colored cross-stratified medium-grained to conglomeratic sandstone. Con-
— 0-101 fined to the San Rafael Swell area although similar strata in other parts of
est tl southeastern Utah might be correlative.
|— Unconformity
Siltstone, pale-reddish-brown, horizontal and ripple laminations, minor very fine
grained cross-laminated sandstones. Formation thickens westward and north-
Moenkopi westward. Sinbad limestone member present only in western part of south-
formation 50-1,000 eastern Utah; 0-200 feet above base of Moenkopi formation; ranges in thickness
from a featheredge to 150 feet; composed of pale-yellowish-brown dense lime-
stone and minor pale-olive siltstone.
Local unconformity
NORTHEASTERN ARIZONA AND CENTRAL, EAST-CENTRAL
AND SOUTHEASTERN UTAH SOUTH-CENTRAL UTAH
Forma- Thick- hi os Forma-| Thick- et oa
ee Member | ness Character and distribution tion | Bess Character and distribution
(feet) (feet)
Siltstone to fine-grained sandstone, pale-
ieee reddish-brown; contains many dissemi-
— nated medium to coarse well-rounded
Prot 0-120 par ee to very thick horizantal 7
is. Not present in south-central, | Kaibal Dolomitic limestone, light-greenish-gray
central, or east-central Utah. lime- | 0-860 |'"Snq' yallowish-eray,. dense, commonly
|— Local unconformity stone fine-grained, sandy, cherty, widespread.
White Sandstone, very-light-gray to yellowish-
Rim | 9.939 | fa. fine- to medium-grained, medium-
sandstone to large-scale cross-laminations. Present
member only in east-central Utah.
Sandstone, moderate- reddish-orange,
Permian De Chelly very fine’ to medium-grained, medium-
= |sandstone| 0-825 | _ to large-scale cross-laminations, cliff-form-
2 | mem ing. Thins to the northwest and pinches
q out near the Arizona-Utah boundary.
E
5
5 Siltstone, pale-reddish-brown, horizontally
2 | Organ laminated to very thick bedded. Con-
& Rock 250-800] tains minor very fine to fine-grained
me es ae Tae de Sandstone, yellowish-gray, fine-grained,
voce | ges | medium- to large-scale cross-laminations.
gant, Contains minor limy sandstone and
Sandstone, yellowish-gray, fine-tomedium- | Stone dolomitic limestone beds. Formation
Cedar grained, medium- to large-scale cross- is cliff forming.
Mesa | 0-1,250| —_ laminations, cliff-forming. Thickens to
sandstone northwest from inferred featheredge in
member northeastern Arizona.
Siltstone to very fine grained sandstone,
Halgaito pale-reddish-brown, horizontally bedded.
oie 0-470 | Contains minor limestone beds. Present
gue only in northeastern Arizona and south
is | eastern Utah.

1Colors according to Rock-Color Chart, National Research Council, Washington, D.C., 1948.

GENERALIZED SECTION OF TRIASSIC ROCKS, AND PART OF THE PERMIAN
AND JURASSIC ROCKS IN SOUTHEASTERN UTAH AND ADJOINING AREAS.

(aa900d ut) 65 = O ZE6HEr