Depositional relations of cretaceous and Lower Tertiary Rocks, Northeastern Alaska
Analysis of depositional environments, new paleontologic data, and analogy with depositional patterns observed in areas to the west all indicate the need for revision of Cretaceous and lower Tertiary stratigraphy in northeastern Alaska. In the Sadlerochit Mountains area of the Arctic National Wildlife Refuge, the northernderived (Ellesmerian), late Neocomian Kemik Sandstone Member and organic-rich pebble shale member of the Kongakut Formation unconformably overlie Jurassic and Triassic rocks. The unconformity, which is of midNeocomian age, is present throughout northernmost Alaska and passes southward into a conformable shelf sequence. After pebble shale deposition, the depositional pattern is simply one of progradational basin filling from a southern (Brookian) provenance. This pattern is represented in vertical sequence initially by deep-marine basinal deposits succeeded by prodelta slope shales, and ultimately by deltaic deposits that prograded to the east or northeast in a predictable fashion over most of the area.
- Research Organization:
- U.S. Geological Service, Denver, CO
- OSTI ID:
- 6932075
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 67:7; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Depositional history and seismic stratigraphy of Lower Cretaceous rocks, National Petroleum Reserve, Alaska and adjacent areas
Permian and Triassic sedimentation in the northeastern Brooks Range, Alaska: Deposition of the Sadlerochit Group
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ALASKA
CENOZOIC ERA
CRETACEOUS PERIOD
FEDERAL REGION X
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
HYDROCARBONS
JURASSIC PERIOD
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NORTH AMERICA
OFFSHORE SITES
ORGANIC COMPOUNDS
PALEONTOLOGY
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
STRATIGRAPHY
TERTIARY PERIOD
TRIASSIC PERIOD
USA