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Geologic Unit: Kurupa
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Map showing publication footprint
  • Usage in publication:
    • Kurupa Sandstone
  • Modifications:
    • Named
    • Reference
    • Biostratigraphic dating
  • Dominant lithology:
    • Sandstone
    • Shale
    • Siltstone
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Mull, C.G., Crowder, R.K., Adams, K.E., Siok, J.P., Bodnar, D.A., Harris, E.E., Alexander, R.A., and Solie, D.N., 1987, Stratigraphy and structural setting of the Picnic Creek allochthon, Killik River quadrangle, central Brooks Range, Alaska; a summary, IN Tailleur, I.L., and Weimer, Paul, eds., Alaskan North Slope geology; Volume 2: Society of Economic Paleontologists and Mineralogists, Pacific Section, North Slope Seminar II, AAPG/SEPM/SEG Pacific Section annual meeting, Anchorage, AK, May 22-24, 1985, book 50, p. 649-662., Prepared by SEPM Pacific Section and Alaska Geol. Soc


Summary:

Named as middle of three formations of Endicott Group in Picnic Creek allochthon. Previously referred to as Kurupa sandstone tongue of Noatak Sandstone (Mull and others, 1985). Type locality designated as exposures on highest point in Kurupa Hills, sec.1, T34N, R17E, Kateel River Meridian, and a reference section designated as exposures in canyon of Akmalik Creek 2 mi (3.2 km) southwest of Kikiktat Mountain, sec.30, T12S, R10W, Umiat Meridian [Killik River quad] north-central AK. Composed of medium- to coarse-grained sandstone with intervening thin shale and siltstone beds. Thickness averages 39 m. Overlies Hunt Fork Shale(?) (Endicott Group). Underlies Kayak Shale (Endicott Group). Plant fossils have been collected throughout formation with largest collection coming from thin platy siltstone bed near top of formation. Assigned Early Mississippian (Tournaisian to Visean) age.

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


Map showing publication footprint
  • Usage in publication:
    • Kurupa Sandstone*
  • Modifications:
    • Adopted
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Moore, T.E., Wallace, W.K., Bird, K.J., Karl, S.M., Mull, C.G., and Dillon, J.T., 1994, Geology of northern Alaska, Chapter 3, IN Plafker, George, and Berg, H.C., eds., Geology of Alaska: Geological Society of America, The Geology of North America, The Decade of North American Geology (DNAG), v. G-1, p. 49-140.


Summary:

Kurupa Sandstone of Endicott Group of Mull and others (1987) is adopted. Unit apparently becomes more shale-rich to west and is not recognized in western Brooks Range. Age is Early Mississippian based on plant fossils and sparse brachiopod fauna.

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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