Title

Geologic Mapping Of The Crescent Formation Of The Southeast Olympic Mountains, Washington State

Document Type

Article

Publication Date

4-1-2003

Publication Title

Abstracts With Programs - Geological Society Of America

Department

Geology

Abstract

A stratigraphic column and geologic map were created for the Crescent Formation of the southeast region of the Olympic Mountains of western Washington State during summer 2002. A total of twelve basalt flows of the Crescent Formation were described and mapped. The flows are young to the southeast and are intruded by several sills and a dike. The stratigraphic column can be correlated with earlier mapping by Clark and students in nearby regions of the Olympic Mountains. Paleomagnetic analysis of samples from five individual flows produced no consistent directions when analyzed with thermal and alternating field demagnetization. SEM and reflected light analyses of oxides present in the basalt show significant secondary alteration of iron and titanium-iron oxides. Petrographic analysis of thin sections as well as XRF analysis to provide chemical compositions for the rock units is in progress.

Volume

35

Issue

44

pp.

16-16

ISSN

0016-7592

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