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Map showing publication footprint
  • Usage in publication:
    • Crystal Peak dolomite
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
    • Sandstone
  • AAPG geologic province:
    • Great Basin province
Publication:

Webb, G.W., 1956, Middle Ordovician detailed stratigraphic sections for western Utah and eastern Nevada: Utah Geological and Mineral Survey Bulletin, no. 57, 77 p.


Summary:

Named for exposures at the Crystal Peak section 10 mi southwest of Smooth Canyon, Millard Co, UT in the Great Basin province. No type locality designated. Separates Watson Ranch tongue (first used) of Swan Peak quartzite from the younger Eureka quartzite. Consists of brown, gray to black, usually fine- to medium-grained, but may be coarse-grained, dolomite. Thin (about 6 ft thick) quartz sandstone and siltstone occur about 50 ft from base. Is 85 ft thick in Smooth Canyon. Fossiliferous: orthocone cephalopods, corals. Cross sections, measured sections. Ranges between 61 ft thick in Tule Valley, UT to 92 ft thick in Desert Range Experiment Station, UT. Is 89 ft thick at Crystal Peak. Middle Ordovician age. Crystal Peak equivalent recognized in the Lehman Formation in the Snake Range of NV. Was not specifically identified in adjoining eastern NV.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Crystal Peak Dolomite*
  • Modifications:
    • Adopted
  • AAPG geologic province:
    • Great Basin province
Publication:

Hintze, L.F., 1974, Preliminary geologic map of the Crystal Peak quadrangle, Millard County, Utah: U.S. Geological Survey Miscellaneous Field Studies Map, MF-635, scale 1:48,000


Summary:

Crystal Peak Dolomite (Webb, 1956) is adopted. Age is Ordovician.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Crystal Peak Dolomite*
  • Modifications:
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • Great Basin province
Publication:

Berdan, J.M., 1976, Middle Ordovician Leperditicopid ostracodes from the Ibex area, Millard County, western Utah: Brigham Young University Geology Studies, v. 23, pt. 3, p. 37-65.


Summary:

Age of the Crystal Peak Dolomite is Middle Ordovician based on fossils [ostracodes].

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Crystal Peak Dolostone*
  • Modifications:
    • Redescribed
    • Overview
  • Dominant lithology:
    • Dolostone
  • AAPG geologic province:
    • Great Basin province
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.


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 Watson Ranch Quartzite (Middle Ordovician); conformably below Eureka Quartzite (Middle Ordovician). Assigned to Whiterockian Series (Middle Ordovician).

Uses Blacksmith Dolostone. In fig. 2 and throughout chapter, "dolostone" is used for rocks composed predominantly of the mineral "dolomite." [Although "dolostone" is the proper term, it has not often been applied to dolomitic formations and members; historically, common practice in the literature has been the use of "dolomite."] Blacksmith Dolostone shown in stratigraphic column of north-central Utah (Great Basin province). Overlies Ute Limestone (Middle Cambrian); underlies Bloomington Formation (Middle Cambrian). Age is Middle Cambrian.

Source: GNU records (USGS DDS-6; Denver GNULEX).


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For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

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