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Geologic Unit: Tuluga
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Map showing publication footprint
  • Usage in publication:
    • Tuluga member*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Bentonite
    • Tuff
    • Sandstone
    • Shale
  • 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 middle member (of 3) of Schrader Bluff formation of Colville group for Tuluga River which enters Anaktuvuk River at north end of Schrader Bluff. Type locality designated as Schrader Bluff, Colville River region, northern AK. Also well exposed on Chandler River near confluence with Ayiyak River and on Colville River in Umiat area. Distinguished by abundant bentonite and tuff interbedded with light-colored sandstone and shale. Thickness of 2200 ft in outcrop belt includes minor units of Tuluvak tongue (new) of Prince Creek formation (new) of Colville group. Overlies Seabee member (new) of Schrader Bluff formation. Underlies Sentinel Hill member (new) of Schrader Bluff formation. Age is Late Cretaceous based on macrofossils, INOCERAMUS LUNDBRECKENSIS McLearn and undescribed SCAPHITES.

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


Map showing publication footprint
  • Usage in publication:
    • Tuluga member†
  • Modifications:
    • Abandoned
  • 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:

Name Tuluga member of Schrader Bluff formation of Gryc and others (1951) abandoned. Rocks now assigned to Seabee formation (rank raised), Rogers Creek member (new) and Barrow Trail member (new) (both of Schrader Bluff formation) (all three in Colville group).

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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