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  • Usage in publication:
    • Third Beach Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Siltstone
  • 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 section: wave-cut terrace and headland east of Third Beach SE/4 SW/4 sec.7 T33N R14W, Strait de Juan de Fuca, Clallam Co, WA. Is second youngest member (of 6) of Makah Formation. Consists of micaceous sandstone with siltstone interbeds and calcareous concretions which weathers grayish orange. Forms thick-bedded, ridge-forming amalgamated turbidite beds. Is 43 m thick. Lies 290 m above Klachopis Point Member (new) and 250 m below Jansen Creek Member (new) (both of Makah Formation). Upper and lower contacts with unnamed siltstone and sandstone in middle part of Makah Formation are generally covered. Is late Eocene age.

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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