Nonmarine facies in the Late Triassic(?) to Early Jurassic Horn Mountain Tuff member of the Talkeetna Formation, Horn Mountain, lower Cook Inlet basin, Alaska

Preliminary Interpretive Report 2016-1-2
By: , and 

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Abstract

The Talkeetna Formation is a prominent lithostratigraphic unit in south-central Alaska. In the Iniskin–Tuxedni area, Detterman and Hartsock (1966) divided the formation into three mappable units including, from oldest to youngest, the Marsh Creek Breccia, the Portage Creek Agglomerate, and the Horn Mountain Tuff Members. The Horn Mountain Tuff Member was thought to include rocks deposited in a nonmarine setting based on the presence of “tree stumps in an upright position” (Detterman and Hartsock, 1966, p. 19) near the top of the type section at Horn Mountain. Bull (2015) recognized possible nonmarine volcaniclastic rocks in the member during the 2014 field season in a saddle on the north side of Horn Mountain (figs. 2-1 and 2-2). The authors visited this location in 2015 and measured a short stratigraphic section to document facies, interpret depositional setting, and constrain age. This report summarizes our field observations and presents preliminary interpretations.

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Additional publication details

Publication type Report
Publication Subtype State/Local Government Series
Title Nonmarine facies in the Late Triassic(?) to Early Jurassic Horn Mountain Tuff member of the Talkeetna Formation, Horn Mountain, lower Cook Inlet basin, Alaska
Series title Preliminary Interpretive Report
Series number 2016-1-2
DOI 10.14509/29535
Year Published 2016
Language English
Publisher Alaska Division of Geological & Geophysical Surveys
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 12 p.
Larger Work Type Report
Larger Work Title Petroleum-related geologic studies in lower Cook Inlet during 2015, Iniskin-Tuxedni region, south-central Alaska
First page 9
Last page 20
Country United States
State Alaska
Other Geospatial Lower Cook Inlet
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