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Geologic Unit: Tanana
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Map showing publication footprint
  • Usage in publication:
    • Tanana schists*
  • Modifications:
    • Named
  • Dominant lithology:
    • Schist
    • Granite
  • AAPG geologic province:
    • Alaska East-Central region
Publication:

Brooks, A.H., 1900, A reconnaissance in the Tanana and White River basins, Alaska, in 1898: U.S. Geological Survey Annual Report, 20, pt. 7, p. 425-494.


Summary:

Widely distributed on Tanana River. Geologic sketch maps show unit extends into Yukon Territory and as far west as Baker Creek. Composed of micaceous, graphitic, and calcareous schists. Between Makutzu and Salchakat Rivers on the Tanana unit contains several large infolded masses of gneissoid porphyritic granite. Tanana schists are distinctive horizon from adjacent gneisses. Mendenhall (1900, same volume) recognizes Tanana schists within Delta River Valley. Correlation table shows age as pre-Silurian.

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


Map showing publication footprint
  • Usage in publication:
    • "Tanana schist"†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Alaska East-Central region
Publication:

Brooks, A.H., and Prindle, L.M., 1911, The Mount McKinley region, Alaska with description of the igneous rocks and of the Bonnifield and Kantishna districts: U.S. Geological Survey Professional Paper, 70, 234 p., (incl. geologic map, scale 1:625,000)


Summary:

Term "Tanana schist" can be regarded as equivalent to Birch Creek schist and can be abandoned. [Note: age of †Birch Creek [now abandoned also] is Precambrian].

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

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

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