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National Geologic Map Database
Geologic Unit: Hogan
Map showing publication footprint
  • Usage in publication:
    • Hogan Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Shale
    • Siltstone
  • AAPG geologic province:
    • Great Basin province
Publication:

Robinson, G.B., Jr., 1961, Stratigraphy and Leonardian fusulinid paleontology in central Pequop Mountains, Elko County, Nevada: Brigham Young University Geology Studies, v. 8, p. 93-145.


Summary:

Name applied to rocks above the regional unconformity at top of Ely Limestone and beneath Ferguson Mountain Formation. [The 171.4 ft sequence of "Virgilian" age above the regional unconformity was assigned to upper part of Ely Limestone in Ferguson Mountain area by Berge, 1960. This sequence was beneath his Ferguson Mountain Formation, and above his unquestioned Ely Limestone.] Type section designated in sec. 34, T34N, R65E, Elko Co., NV in the Great Basin province. Name Hogan taken from a railroad siding. Is 750 ft thick at type measured section where it consists of thin- to medium-bedded, silty to quartzite peaty, gray limestone, calcareous siltstone, calcareous shale, and argillaceous limestone, and some interbedded siliceous, cherty limestone, fine crystalline limestone, medium crystalline bioclastic limestone. Fossils include crinoid stems, brachiopods, corals, gastropods, and bryozoans, fusulinids. Considered middle to late Desmoinesian age, [Middle] Pennsylvanian age. Geologic map of the Pequop Mountains, Elko Co. Graphic sections.

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


Map showing publication footprint
  • Usage in publication:
    • Hogan Formation
  • Modifications:
    • Contact revised
  • AAPG geologic province:
    • Great Basin province
Publication:

Bissell, H.J., 1964, Ely, Arcturus, and Park City Groups (Pennsylvanian-Permian) in eastern Nevada and western Utah: American Association of Petroleum Geologists Bulletin, v. 48, no. 5, p. 565-636. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Upper contact of Hogan Formation (upper formation of Ely Group) revised. In eastern Nevada and western Utah (Great Basin province), unconformably underlies Riepe Spring Limestone (revised), basal formation of Arcturus Group (rank raised). In northern Confusion Range and Gold Hill mining district, Utah, where the basal Riepe Spring and Riepetown formations of the Arcuturus are not separable, the Hogan unconformably underlies Ferguson Mountain Formation (revised), basal formation of Arcturus Group. Age is Pennsylvanian (Desmoinesian). Report includes correlation chart, graphic section, cross sections.

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


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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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