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National Geologic Map Database
Geologic Unit: Roosevelt
Map showing publication footprint
  • Usage in publication:
    • Roosevelt member [formation]
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Chert
  • AAPG geologic province:
    • Southwestern Basin-and-Range region
Publication:

Hinds, N.E.A., 1935, Ep-Archaean and Ep-Algonkian Intervals in Western North America: Carnegie Institution of Washington Publication, no. 463, pt. 1, p. 1-52.


Summary:

Pg. 32. Roosevelt member [formation] of Apache group. Seventh [upper] member of group. Chert and dark-reddish and purplish siliceous shales. Maximum thickness 30 feet. Underlies Troy quartzite and overlies a vesicular basalt flow south of Roosevelt Dam. Age is Precambrian (Algonkian).
[Present locally at and near Roosevelt Dam, Gila Co., south-central AZ.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 3336); GNC index card files (USGS-Reston).


Map showing publication footprint
  • Usage in publication:
    • Roosevelt Member [Formation]†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Southwestern Basin-and-Range region
Publication:

Shride, A.F., 1967, Younger Precambrian geology in southern Arizona: U.S. Geological Survey Professional Paper, 566, 89 p. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp566]


Summary:

Pg. 8-9 (table 1), 42. †Roosevelt Member [Formation] of Apache Group of Hinds (1935) abandoned. Rocks included in unnamed argillite member at top of Mescal Limestone of Apache Group.
[Author states Hinds used the term "member" in a formational sense.]

Source: Publication; GNC index card files (USGS-Reston).


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 ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).