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Geologic Unit: Makah
Map showing publication footprint
  • Usage in publication:
    • Makah Formation*
  • Modifications:
    • Named
    • Reference
  • Dominant lithology:
    • Siltstone
    • Sandstone
    • Conglomerate
    • Tuff
  • AAPG geologic province:
    • Olympic Mountains province
Publication:

Snavely, P.D., Jr., Niem, A.R., and Pearl, J.E., 1978, Twin River Group (upper Eocene to lower Miocene); defined to include the Hoko River, Makah, and Pysht Formations, Clallam County, Washington, IN Sohl, N.F., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1977: U.S. Geological Survey Bulletin, 1457-A, p. A111-A120.


Summary:

Named for Makah Indian Reservation, NW Olympic Peninsula, WA. Type locality at shore cliffs and wave-cut platform exposures along Strait of Juan de Fuca from Waadah Island and Baada Point to Kydaka Point, Clallam Co, WA. Two reference sections designated. Is middle unit in Twin River Group. Composed of siltstone, sandstone, conglomerate, and tuff. Calcareous concretions throughout unit range in size from 60 to 150 mm (spheroidal shapes) and from 0.5 to 4 m long (ellipsoidal shapes). Is deep-marginal-basin sequence including turbidite sandstone packets and 200-m-thick olistostrome (near middle of unit). Gradationally or locally unconformably overlies Hoko River Formation (new); gradationally or locally unconformably underlies Pysht Formation (new) (both of Twin River Group). Ranges in age from late Eocene (late Narizian Stage) to Oligocene (Zemorrian Stage).

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


Map showing publication footprint
  • Usage in publication:
    • Makah Formation*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Olympic Mountains province
Publication:

Snavely, P.D., Jr., Niem, A.R., MacLeod, N.S., Pearl, J.E., and Rau, W.W., 1980, Makah Formation; a deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington, IN Shorter contributions to stratigraphy: U.S. Geological Survey Professional Paper, 1162-B, 28 p. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp1162B]


Summary:

Type locality of Makah Formation (Snavely and others, 1978) is redesignated its type section. Divided into (ascending) Baada Point, Dtokoah Point, Carpenters Creek Tuff, Klachopis Point, Third Beach, and Jansen Creek Members (all new). Sequences of amalgamated turbidite sandstone beds called Falls Creek unit is separated from underlying Jansen Creek Member by about 450 m of poorly exposed thin-bedded sandstone and siltstone of Makah Formation. Also unnamed 15-m-thick unit of fine-grained sandstone underlies Baada Point Member. Age ranges from late Eocene to late Oligocene based on foraminiferal assemblages.

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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