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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Reclamation group
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Shale
  • AAPG geologic province:
    • Chadron arch
    • Denver basin
Publication:

Condra, G.E., Reed, E.C., and Scherer, O.J., 1940, Correlation of the formations of the Laramie Range, Hartville uplift, Black Hills, and western Nebraska: Nebraska Geological Survey Bulletin, no. 13, 52 p., Revised 1950


Summary:

Named Reclamation group. These rocks were previously assigned to Division V of Hartville formation [not used in this report] in earlier reports. Recognized in Hartville uplift area, Wyoming, and Hot Springs area, South Dakota, on the Chadron arch. Composed of alternating beds of dark-gray and maroon, mottled dense limestone; and dark maroon and green polka dot, thin bedded shale with limestone nodules. Limestone beds are fossiliferous. Ranges from 72 to 87 feet thick. Overlies Fairbank formation (new); underlies Roundtop group (new). Correlates with part of Cherokee group of Des Moines age. Age is Pennsylvanian. Report includes measured sections.

Type locality: Reclamation Hill, sec. 27, T. 27 N., R. 66 W., Platte Co., WY, in the Denver basin. Named from Reclamation Hill.

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


Map showing publication footprint
  • Usage in publication:
    • Reclamation group
  • Modifications:
    • Overview
    • Areal extent
  • AAPG geologic province:
    • Powder River basin
Publication:

Agatston, R.S., 1954, Pennsylvanian and Lower Permian of northern and eastern Wyoming: American Association of Petroleum Geologists Bulletin, v. 38, no. 4, p. 508-583. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Combined with overlying Roundtop group to form a subdivision of Hartville formation in the subsurface, along the east side of Powder River basin in Niobrara, Weston, Crook, and Campbell Counties, Wyoming. /Reclamation-Roundtop groups overlie Fairbank formation and underlie /Meek-Wendover and Hayden groups, all considered subdivisions of the Hartville formation. Correlated with Amsden formation in the Bighorn Mountains, Wyoming. Age is Early Pennsylvanian (Atokan).
[The use of a hyphen between undifferentiated [groups] has not been considered proper notation since 1933 (see CSN, Art. 13a, p. 437-438). Where the [groups] have not been separated in the field, it is considered proper notation to add the word "and", "undifferentiated", "included", etc.; and list [groups] in order of age (youngest first).]

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


Map showing publication footprint
  • Usage in publication:
    • Reclamation group
  • Modifications:
    • Overview
    • Areal extent
  • AAPG geologic province:
    • Williston basin
Publication:

McCauley, V.T., 1956, Pennsylvanian and Lower Permian of the Williston basin, IN First international Williston basin symposium: International Williston Basin Symposium Field Trip Guide, Joint annual field conference of North Dakota Geological Society and Saskatchewan Geological Society, Bismarck, ND, October 9-12, 1956, no. 1, p. 150-164.


Summary:

Used in formational sense in Williston basin. Consists of argillaceous limestone interbedded with thin, red and green shales. Mapped in subsurface, in combination with overlying Roundtop and underlying Fairbank(?) [formation]. Formerly included near the top of Amsden formation by the North Dakota Geological Society (1954, Stratigraphy of the Williston basin). Age is probably Early Pennsylvanian (Atokan); see correlation chart (table 2, p. 151).

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


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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 ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).