GEOLEX

Summary of Citation: Luman

Publication:
Pipiringos, G.N., 1955, Tertiary rocks in the central part of
   the Great Divide basin, Sweetwater County, Wyoming, IN Camp,
   R.J., chairman, Green River basin: Wyoming Geological
   Association Field Conference Guidebook, no. 10, p. 100-104

Usage in Publication:
Luman tongue*

Modifications:	Geologic Province:	Dominant Lithology:
Named	Greater Green River basin	Oil-shale Sandstone Siltstone Shale

Summary:
Named as a tongue of the Green River formation for excellent exposures on Luman Butte, sec 34, T24N, R97W, Sweetwater Co, WY, Greater Green River basin. No type locality designated. Overlies the newly named Red Desert tongue of the Wasatch formation. Underlies the newly named Niland tongue of the Wasatch. Intertongues with the newly named Battle Spring formation, a coarse-grained to pebbly arkosic sandstone that intertongues with the entire Green River and Wasatch formations of this area. Consists of oil-shale, fossiliferous calcareous sandstone as prominent and persistent low bluffs, varved siltstone, and clay shale. Crops out in two areas: 1) Luman Butte southeast to center of T22N, R94W; and 2) southern part of area parallel to Union Pacific RR. Eroded from central part of Great Divide basin. Is: 180 ft thick at Luman Butte; 200 ft thick at Tipton station; 390 ft thick at Frewen station. A pastel marker, a limestone composed of gray-black concretions, present at base. A wormy (vertical worm borings) is basal unit of Luman. Has mollusks and ostracod fossils. Of early Eocene age. Cross section.

Summary of Citation: Luman

Publication:
Roehler, H.W., 1965, Early Tertiary depositional environments
   in the Rock Springs uplift area, IN De Voto, R.H., and Bitter,
   R.K., eds., Sedimentation of Late Cretaceous and Tertiary
   outcrops, Rock Springs uplift: Wyoming Geological Association
   Field Conference Guidebook, no. 19, p. 140-150

Usage in Publication:
Luman Member, Tongue

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Greater Green River basin

Summary:
Areal limits map (fig 2) shows Luman to occur in area of southern Green River Basin, Rock Springs uplift, Great Divide Basin, and Washakie Basin, all within Greater Green River basin, WY. Luman is one of five members of Green River Formation which consists of (ascending): Ramsey Ranch Member (new), Luman, Tipton Shale Member, Wilkins Peak Member, and Laney Shale Member. Chart showing previous nomenclature; restored section. Eocene age.

Summary of Citation: Luman

Publication:
Roehler, H.W., 1992, Correlation, composition, areal distribution,
   and thickness of Eocene stratigraphic units, greater Green
   River basin, Wyoming, Utah, and Colorado, IN Geology of the
   Eocene Wasatch, Green River, and Bridger (Washakie) formations,
   greater Green River basin, Wyoming, Utah, and Colorado: U.S.
   Geological Survey Professional Paper, 1506-E, p. E1-E49,
   (incl. geologic map, scale 1:500,000)

Usage in Publication:
Luman Tongue*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits Overview	Greater Green River basin

Summary:
Isopach map (fig 17) shows areal extent within Greater Green River basin, WY and CO. Lake in which Luman (Green River Formation) was deposited was 175 mi long by 60 mi wide. Luman deposited along north flank of Uinta Mountains, across Rock Springs uplift, and in parts of Great Divide, Washakie, and Sand Wash basins. Maximum thickness is 455 ft in southwest part of Washakie basin. Stratigraphic chart; cross sections. Eocene age.

Summary of Citation: Luman

Publication:
Roehler, H.W., 1993, Eocene climates, depositional environments,
   and geography, greater Green River basin, Wyoming, Utah, and
   Colorado, IN Geology of the Eocene Wasatch, Green River, and
   Bridger (Washakie) formations, greater Green River basin,
   Wyoming, Utah, and Colorado: U.S. Geological Survey Professional
   Paper, 1506-F, p. F1-F74

Usage in Publication:
Luman Tongue*

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Greater Green River basin

Summary:
Paleogeographic map (fig. 46) of this lower tongue of Green River Formation showing depositional environments in Greater Green River basin. Lake Gosiute reached a maximum size of about 6650 sq mi during Luman time. Shoreline sands were deposited around margins of lake. Lake reached a depth of 400 ft about 25 mi northeast of common boundary of WY, UT, and CO. Surrounding the lake were narrow bands of gray and green flood-plain deposits; arkosic deltaic deposits of the Battle Spring Formation mixed with Luman along northeastern shores of lake. Lacustrine deposits formed mostly oil shale. Overlies Ramsey Ranch Member of Wasatch Formation; underlies Niland Tongue of Wasatch. Generalized stratigraphic correlation chart (fig. 41). Geologic map (fig. 1) of Vermilion Creek area, northwest CO. Eocene age.