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Map showing publication footprint
  • Usage in publication:
    • Sentinel Hill member*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Bentonite
    • Tuff
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Gryc, George, Patton, W.W., Jr., and Payne, T.G., 1951, Present Cretaceous stratigraphic nomenclature of northern Alaska: Washington Academy of Sciences Journal, v. 41, no. 5, p. 159-167.


Summary:

Named as uppermost member (of 3) of Schrader Bluff formation of Colville group for section in Sentinel Hill core test no.1 Also occurs in outcrop belt along Colville River northern AK. Characterized by volcanic glass shards, abundant bentonite, and tuff. Intertongues with Kogosukruk tongue (new) of nonmarine Prince Creek formation (new) of Colville group; beds total 2340 ft in thickness. Overlies Tuluga member (new) of Schrader Bluff formation; underlies Sagavanirktok formation (new). Contains abundant radiolarians, fish bones, and diagnostic foraminifers which indicate Late Cretaceous age.

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


Map showing publication footprint
  • Usage in publication:
    • Sentinel Hill member*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Whittington, C.L., 1956, Revised stratigraphic nomenclature of Colville group, IN Gryc, George, and others, Mesozoic sequence in Colville River region, northern Alaska: American Association of Petroleum Geologists Bulletin, v. 40, no. 2, p. 244-253. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Surface type locality designated as bluffs along northwest side of Colville River from 5 to 15 mi northeast of Umiat Mountain, northern AK. Measured type section includes 1040 ft of strata of which 335 ft near middle part are nonmarine beds assigned to Kogosukruk tongue of Prince Creek formation of Colville group. Overlies Barrow Trail member (new) of Schrader Bluff formation of Colville group.

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


Map showing publication footprint
  • Usage in publication:
    • Sentinel Hill Member†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Mull, C.G., Houseknecht, D.W., and Bird, K.J., 2003, Revised Cretaceous and Tertiary stratigraphic nomenclature in the Colville basin, northern Alaska; Version 1.0: U.S. Geological Survey Professional Paper, 1673, 51 p., Prepared in cooperation with Alaska Dept. Nat. Resources, Div. Geol. Geophys. Surveys and Div. Oil and Gas [http://ngmdb.usgs.gov/Prodesc/proddesc_54811.htm]


Summary:

Pg. 5 (fig. 4), 6-8 (table 1), 26. †Sentinel Hill Member of Schrader Bluff Formation of †Colville Group. Abandoned. (†Colville also abandoned.) Rocks reassigned to unnamed upper part of Schrader Bluff Formation. [See Schrader Bluff.]

Source: Publication.


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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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