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Map showing publication footprint
  • Usage in publication:
    • Winchuck Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Graywacke
    • Mudstone
  • AAPG geologic province:
    • Klamath Mountains province
Publication:

Widmier, J.M., 1963, Mesozoic stratigraphy of the west-central Klamath province: a study of eugeosynclinal sedimentation: Dissertation Abstracts, v. 23, no. 11, p. 4320-4321.


Summary:

Report discusses west-central Klamath Mountains province in southwestern OR and northwestern CA. Winchuck River is in Curry Co, OR. Named as member of Chetco Formation (new). Is gradational with Macklyn Member (new) (Chetco Formation). Macklyn considered older but evidence not convincing. Is considered older than middle Portlandian.

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


Map showing publication footprint
  • Usage in publication:
    • Winchuck Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Klamath Mountains province
Publication:

Dott, R.H., Jr., 1971, Geology of the southwestern Oregon coast west of the 124th Meridian: Oregon Department of Geology and Mineral Industries Bulletin, no. 69, 63 p., (incl. geologic maps, scale 1:62,500 and 1:250,000)


Summary:

Winchuck Member [of Chetco Formation] of Widmier [1963] is described and mapped as member of Dothan Formation. Named for Winchuck River near OR-CA border along which typical outcrops occur. Composed of more than 60% black mudstone and siltstone with some sandstone beds, chert, and conglomerate. Age of Dothan Formation given as Jurassic. Includes discussion of age relationships with Franciscan and Otter Point complexes.

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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