GEOLEX

Summary of Citation: Sevy

Publication:
Nolan, T.B., 1930, Paleozoic formations in the Gold Hill
   quadrangle, Utah: Washington Academy of Sciences Journal, v.
   20, no. 17, p. 421-432

Usage in Publication:
Sevy dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
First used	Great Basin province	Dolomite

Summary:
First published use. Intent to name not stated. Probably named for exposures in Sevy Canyon, Deep Creek Range, Tooele Co, UT in the Great Basin province. No locality designated. Is a well-bedded, light mouse-gray, dense dolomite that occurs in layers 6 to 12 in thick. Contains a few darker beds at top. Locally has tiny nodules of light-colored chert. Basal bed above Laketown dolomite is conglomeratic. Is about 450 ft thick. Few crinoid stems and poorly preserved gastropods. Gradationally overlain by Simonson dolomite (new). Of Middle Devonian age.

Summary of Citation: Sevy

Publication:
Staatz, M.H. and Osterwald, F.W., 1959, Geology of the Thomas
   Range fluorspar district, Juab County, Utah: U.S. Geological
   Survey Bulletin, 1069, 97 p., (incl. geologic maps, scale
   1:12,000 and 1:6000)

Usage in Publication:
Sevy dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Revised Overview	Great Basin province

Summary:
Overlies gradationally to sharply the newly named Thursday dolomite and underlies gradationally the Simonson dolomite and Guilmette formations, undivided. Stratigraphic section 1,122 ft thick measured at point 5,540 ft N 78 degrees W of the Oversight mine in T12S, R12W, Juab Co, UT in the Great Basin province. Crops out extensively west and northwest of main ridge of Spors Mountain. Is a fine-grained massive mouse-gray dolomite of uniform and distinctive character. Is thin to medium bedded. Toward base, dark irregular chert fills joints and fracture planes. Is unfossiliferous in district. Assigned to the Devonian. Geologic map.

Summary of Citation: Sevy

Publication:
Poole, F.G., Sandberg, C.A. and Boucot, A.J., 1977, Silurian
   and Devonian paleogeography of the western United States, IN
   Stewart, J.H., Stevens, C.H., and Fritsche, A.E., eds.,
   Paleozoic paleogeography of the western United States; Pacific
   Coast paleogeography symposium I: Society of Economic
   Paleontologists and Mineralogists, Pacific Section, Pacific
   Coast Paleogeography Symposium, 1, Bakersfield, CA, April
   22, 1977, p. 39-65

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Great Basin province

Summary:
Age of the Sevy Dolomite is modified from Early and Middle Devonian to: Late Silurian and Early Devonian on the basis of stratigraphic position.

Summary of Citation: Sevy

Publication:
Sandberg, C.A. and Poole, F.G., 1977, Conodont biostratigraphy
   and depositional complexes of Upper Devonian cratonic-platform
   and continental-shelf rocks in the western United States, IN
   Murphy, M.A., and others, eds., Proceedings of the 1977 annual
   meeting of the Paleontological Society on Devonian of western
   North America: University of California-Riverside, Campus
   Museum Contributions, no. 4, Paleontological Society, 1977
   Annual Meeting, Riverside, CA, November, 1977, p. 144-182

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Great Basin province

Summary:
Red Warrior Limestone abandoned. Its rocks reassigned, in the Star Range, Beaver Co, UT in the Great Basin province, to the lower part of the Upper Devonian Pinyon Peak Limestone, the Devonian Sevy Dolomite, Simonson Dolomite, and Guilmette Formation, and to the Silurian Laketown Dolomite. Isopach map of lower part of latest Famennian age; ranges from 0 to 20 m. Lithofacies map; is a bioclastic limestone. [Upper part not discussed.]

Summary of Citation: Sevy

Publication:
Hintze, L.F., 1980, Preliminary geologic map of the Fish Springs
   NW and Fish Springs SW quadrangles, Juab and Tooele Counties,
   Utah: U.S. Geological Survey Miscellaneous Field Studies Map,
   MF-1148, 1 sheet, scale 1:24,000

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified Revised	Great Basin province

Summary:
Assigned Early Devonian age in Fish Springs Range, Juab Co, UT, Great Basin province. Age probably based on stratigraphic position. Overlies [unconformably] Middle Silurian Thursday Member (rank reduced) of Laketown Dolomite; underlies Middle Devonian Simonson Dolomite.

Summary of Citation: Sevy

Publication:
Steven, T.A. and Morris, H.T., 1983, Geologic map of the Cove
   Fort quadrangle, west-central Utah: U.S. Geological Survey
   Miscellaneous Investigations Series Map, I-1481, 1 sheet,
   scale 1:50,000

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Great Basin province

Summary:
Areally extended to the Dog Valley Mountain area in the northeast part of the quad in the Great Basin province, where it is younger than the Middle and Late Silurian Laketown Dolomite and older than the Middle Devonian Simonson Dolomite. Assigned an Early and Middle Devonian age.

Summary of Citation: Sevy

Publication:
Van Loenen, R.E., 1987, Geologic map of the Mount Grafton
   Wilderness Study Area, Lincoln and White Pine Counties,
   Nevada: U.S. Geological Survey Miscellaneous Field Studies
   Map, MF-1938, 1 sheet, scale 1:50,000

Usage in Publication:
Sevy Dolostone*

Modifications:	Geologic Province:	Dominant Lithology:
Mapped 1:50k Redescribed	Great Basin province	Dolostone

Summary:
Redescribed on basis of change in lithic designation from dolomite to dolostone (more appropriate term). Is mapped undivided with Simonson Dolostone in study area, Lincoln and White Pine Cos, NV in east-central part of Great Basin province. Is chiefly medium- to light-gray aphanitic dolostone in beds 3-5 ft thick. Weathers light gray and splits into blocky, angular fragments. Dolostone resembles aphanitic dolostone of overlying Simonson (Middle Devonian). Thin bed of fine- to medium-grained quartz sandstone occurs near top of unit. Total thickness is about 800 ft. Overlies Laketown Dolostone (Middle and Upper Silurian). Age is Early and Middle Devonian.

Summary of Citation: Sevy

Publication:
Hintze, L.F. and Best, M.G., 1987, Geologic map of the Mountain
   Home Pass and Miller Wash quadrangles, Millard and Beaver
   Counties, Utah, and Lincoln County, Nevada: U.S. Geological
   Survey Miscellaneous Field Studies Map, MF-1950, 1 sheet,
   scale 1:24,000

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Great Basin province	Dolomite

Summary:
Is Lower Devonian formation shown only in cross sections in southern part of the Mountain Home Range in western Millard and Beaver Cos, southwest UT (Great Basin province). Is shown to overlie Laketown Dolomite (Middle Silurian). Is shown below Simonson Dolomite (Middle Devonian). Is described as uniformly light-gray-weathering, dense, finely crystalline dolomite that contains a few thin sandy beds. Regional thickness about 400 m. In subsurface only (see cross sections).

Summary of Citation: Sevy

Publication:
Poole, F.G., Stewart, J.H., Palmer, A.R., Sandberg, C.A., Madrid,
   R.J., Ross, R.J., Jr., Hintze, L.F., Miller, M.M. and Wrucke,
   C.T., 1992, Latest Precambrian to latest Devonian time;
   development of a continental margin, Chapter 2, IN Burchfiel,
   B.C., Lipman, P.W., and Zoback, M.L., eds., The Cordilleran
   Orogen; conterminous United States: Geological Society of
   America, The Geology of North America, The Decade of North
   American Geology (DNAG), v. G-3, p. 9-56

Usage in Publication:
Sevy Dolostone*

Modifications:	Geologic Province:	Dominant Lithology:
Redescribed Overview	Great Basin province	Dolostone

Summary:
Is redescribed as dolostone. The name "dolostone" is used for rocks composed predominantly of the mineral "dolomite" on Figure 2 and throughout this chapter, although in the literature it has been common practice to use dolomite rather than dolostone in formal names of dolomitic formations and members. Occurs in stratigraphic column for west-central UT (Great Basin province); conformably above unnamed Upper Silurian dolostone; unconformably below Simonson Dolostone (redescribed) (Middle Devonian). In stratigraphic column for east-central NV (Great Basin province); conformably above unnamed Upper Silurian dolostone; unconformably below McColley Canyon Formation (Lower Devonian). Assigned to Lochkovian and Pragian (Lower Devonian).

Summary of Citation: Sevy

Publication:
Lund, Karen and Beard, L.S., 1992, Extensional geometry in the
   northern Grant Range, east-central Nevada; implications for
   oil deposits in Railroad Valley, IN Thorman, C.H., ed.,
   Application of structural geology to mineral and energy
   resources of the central and western United States: U.S.
   Geological Survey Bulletin, 2012-I, Golden, CO, October 9-10,
   1990, p. 1-9

Usage in Publication:
Sevy Dolostone*

Modifications:	Geologic Province:	Dominant Lithology:
Revised Age modified

Summary:
Unit name revised to Sevy Dolostone in report area. Age in report area modified from Devonian to: Late Silurian and Early Devonian.

Summary of Citation: Sevy

Publication:
Ketner, K.B., 1997, Geologic maps showing structural modes in
   the Goshute Mountains and Toano Range, Elko County, Nevada:
   U.S. Geological Survey Miscellaneous Investigations Series
   Map, I-2546, 1 sheet, scale 1:24,000

Usage in Publication:
Sevy Dolomite*

Modifications:	Geologic Province:	Dominant Lithology:
Age modified	Great Basin province

Summary:
Age of the Sevy Dolomite in this area (Silver Zone basin area, Johnson Canyon area) is here revised [from Early Devonian] to: Early and Middle Devonian [based on regional stratigraphic relations].