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Map showing publication footprint
  • Usage in publication:
    • Sissel Gulch Graywacke*
  • Modifications:
    • Named
  • Dominant lithology:
    • Graywacke
  • AAPG geologic province:
    • Klamath Mountains province
Publication:

Hotz, P.E., 1977, Geology of the Yreka quadrangle, Siskiyou County, California: U.S. Geological Survey Bulletin, 1436, 72 p., (incl. geologic map, scale 1:62,500)


Summary:

Type locality designated as upper Moffett Creek drainage, including Sissel Gulch, from SW/4 sec.32 T43N R7W to south boundary of Yreka quad, sec.7 T42N R7W, Siskiyou Co, CA. Composed of fine-grained, hard, greenish-gray graywacke with faint parting plane parallel to bedding. Thickness ranges from 600 to 700 m. Overlies greenschist on thrust fault; conformably(?) underlies Duzel Phyllite. Is Ordovician(?) age.

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


Map showing publication footprint
  • Usage in publication:
    • Sissel Gulch Graywacke*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Klamath Mountains province
Publication:

Potter, A.W., Hotz, P.E., and Rohr, D.M., 1977, Stratigraphy and inferred geologic settings of lower Paleozoic rocks in the eastern Klamath Mountains, northern California, IN Stewart, J.H., Stevens, C.H., and Fritsche, A.E., eds., Paleozoic paleogeography of the western United States; Pacific Coast paleogeography symposium I: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium, Bakersfield, CA, April 22, 1977, 1, p. 421-440.


Summary:

Included in Yreka assemblage as lowest unit in apparent structural succession above Mallethead thrust. Underlies and locally interfingers with Duzel Phyllite (Yreka assemblage). Sissel Gulch Graywacke may represent turbidite unit. Provisionally assigned an Ordovician and(or) Silurian 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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