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Revised age and structural interpretations of Nuka Formation at Nuka Ridge, northwestern Alaska

American Association of Petroleum Geologists Bulletin

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Abstract

New collections of foraminifers and macrofossils from Nuka Ridge, the type area of the enigmatic Nuka Formation, demonstrate that the type Nuka Formation is not a continuous stratigraphic sequence as originally described. Paleontologic evidence indicates the presence of a structurally repeated sequence at Nuka Ridge consisting of Upper Mississippian (Meramec and younger) strata overlain by Permian beds which, in turn, are succeeded by Triassic(?) and Cretaceous rocks. Mississippian calcareous mudstone and limestone units are correlated with the Lisburne Group; microcline-bearing arkose units with Mississippian and Permian macrofossils and microfossils represent the Nuka Formation; units of chert are inferred to be of Permian and Triassic age; and wacke at the top of the sequence resembles unnamed wacke assigned to the Cretaceous elsewhere. These new data and their interpretations indicate that the type section of the Nuka Formation is inadequate. The standard for the Nuka Formation is therefore referred to a newly measured section of the middle arkosic unit of the old section.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Revised age and structural interpretations of Nuka Formation at Nuka Ridge, northwestern Alaska
Series title:
American Association of Petroleum Geologists Bulletin
Volume
57
Issue:
7
Year Published:
1973
Language:
English
Publisher:
American Association of Petroleum Geologists (AAPG)
Publisher location:
Tulsa, OK
Contributing office(s):
Office of National Petroleum Reserve in Alaska
Description:
5 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1348
Last page:
1352
Country:
United States
State:
Alaska
Other Geospatial:
Nuka Ridge