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Map showing publication footprint
  • Usage in publication:
    • Manastash formation*
  • Modifications:
    • First used
  • AAPG geologic province:
    • Cascades province
Publication:

Smith, G.O., 1902, The coal fields of the Pacific Coast, IN Walcott, C.D., Twenty-second annual report of the Director of the United States Geological Survey; Part III, Coal, oil, cement: U.S. Geological Survey Annual Report, 22, pt. 3, p. 473-513.


Summary:

First use of the Manastash [formation]. Carbonaceous beds different in character from those of the Roslyn formation. Age is Eocene (younger than Roslyn).

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


Map showing publication footprint
  • Usage in publication:
    • Manastash formation*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Sandstone
    • Shale
    • Conglomerate
  • AAPG geologic province:
    • Cascades province
Publication:

Smith, G.O., 1904, Description of the Mount Stuart quadrangle, Washington: U.S. Geological Survey Geologic Atlas of the United States Folio, Mount Stuart folio, no. 106, 10 p., scale 1:125,000


Summary:

Unit is named the Manastash formation, [probably] named for Manastash Creek, [Kittitas Co.], WA. Consists of sandstones and shales. East of Frost Mountain the sandstones become massive and quartzose, with pebble bands. Shales contain seams of bone[?] and impure coal. Thickness on Taneum Creek is about 200 ft. Unconformably overlies the Easton schist; unconformably overlain by the Yakima basalt. Age is late Eocene based on fossils [plants].

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


Map showing publication footprint
  • Usage in publication:
    • Manastash formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Cascades province
Publication:

Smith, G.O., and Calkins, F.C., 1906, Description of the Snoqualmie quadrangle, Washington: U.S. Geological Survey Geologic Atlas of the United States Folio, Snoqualmie folio, no. 139, 14 p., scale 1:125,000


Summary:

Manastash formation in geographically extended into the report area. Age is late Eocene.

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


Map showing publication footprint
  • Usage in publication:
    • Manastash Formation
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Cascades province
Publication:

Stout, M.L., 1964, Geology of a part of the south-central Cascade Mountains, Washington: Geological Society of America Bulletin, v. 75, no. 4, p. 317-334.


Summary:

Rocks assigned to the Manastash Formation (Smith, 1904; Smith and Calkins, 1906) are considered to be part of the Naches Formation.

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


Map showing publication footprint
  • Usage in publication:
    • Manastash Formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Cascades province
Publication:

Tabor, R.W., Waitt, R.B., Jr., Frizzell, V.A., Jr., Swanson, D.A., Byerly, G.R., and Bentley, R.D., 1982, Geologic map of the Wenatchee 1:100,000 quadrangle, central Washington: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1311, 1 sheet, 26 p., scale 1:100,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_9137.htm]


Summary:

Manastash Formation consists of arkosic to quartzose sandstone, shale, and conglomerate containing minor coal beds. Stout (1964) included this unit in the Naches Formation. Age assignment based on plants is late Eocene and early Oligocene. Age is here considered to be Eocene (50 Ma) based on stratigraphic relationships.

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


Map showing publication footprint
  • Usage in publication:
    • Manastash Formation*
  • Modifications:
    • Age modified
    • Areal extent
  • AAPG geologic province:
    • Cascades province
Publication:

Tabor, R.W., Frizzell, V.A., Booth, D.B., and Waitt, R.B., 2000, Geologic map of the Snoqualmie Pass 30' x 60' quadrangle, Washington; Version 1.0: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2538, 1 sheet, 57 p., scale 1:100,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_37097.htm]


Summary:

Manastash Formation is geographically extended into the report area. Age is everywhere revised from Eocene to: early Eocene.

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


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