Late-Wisconsin Event in the Upper Cook Inlet Region, Southcentral Alaska

Author(s): Julie Brigham-Grette; Richard D. Reger; Rodney A. Combellick

Editor(s): Milton Wiltse

Year: 1995

Summary

The Alaska Division of Geological & Geophysical Surveys (DGGS) presents Short Notes on Alaska Geology 1995, the ninth issue in this series. There are ten papers, two each in Quaternary geology, structural geology, stratigraphy-sedimentology, and paleontology, and one each in economic geology and geochemistry. Almost all geographic regions of the State are represented. Overall, they reflect the wide range of subjects and broad geographic distribution of current geologic research in Alaska.

This article presents new evidence and reconsideration of previously published evidence for late-Wisconsin events in the upper Cook Inlet region. Shoreline bluffs along Knik Arm and Turnagain Arm in upper Cook Inlet expose well-preserved evidence of glacial and marine events late in the Naptowne glaciation. This complex record has been studied by many workers during the past 45 years, commonly with conflicting interpretations. Nine new radiocarbon dates strongly suggest late-Wisconsinan age of the Bootlegger Cove Formation. The article documents Elmendorf-age glacial advances in Knik Arm, Turnagain Arm, and elsewhere in southcentral Alaska as evidence.

Cite this Record

Late-Wisconsin Event in the Upper Cook Inlet Region, Southcentral Alaska. Julie Brigham-Grette, Richard D. Reger, Rodney A. Combellick, Milton Wiltse. Short Notes on Alaska Geology. Professional Report (117). 1995 ( tDAR id: 457965) ; doi:10.6067/XCV8457965

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Keywords

Material
Dating Sample • Fauna • Ground Stone • Macrobotanical • Shell

Investigation Types
Geophysical Survey • Systematic Survey

General
Age Dates • Balanus • Bootlegger Cove Formation • C14 • Cultural Resources • Depositional Environment • Foraminifera • Fossils • Geochronology • Glacial Geology • Glacial Processes • Hiatella • Joint Base Elmendorf-Richardson • Knik Glaciation • Macoma Balthica • Marine Transgressions • Mollusks • Mya Truncata • Naptowne Glaciation • Ostracods • Peat • Silt • Stratigraphy • Vegetation

Geographic Keywords
Alaska (State / Territory) • Anchorage, AK • Cook Inlet

Temporal Keywords
Holocene • Pleistocene

Spatial Coverage

min long: -150.152; min lat: 61.041 ; max long: -149.363; max lat: 61.381 ;

Individual & Institutional Roles

Contact(s): Joint Base Elmendorf-Richardson CRM Manager

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