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Filtering by: Subject Geology -- Oregon -- Astoria Advisor Niem, Alan Subject Geology -- Oregon -- Clatsop County

Geology of the Elsie-lower Nehalem River area, south-central Clatsop and northern Tillamook counties, northwestern Oregon

Creator:

Mumford, Daniel Franklin

Abstract:

The middle Eocene Tillamook Volcanics form the oldest rock unit in the Elsie-lower Nehalem River area. K-Ar age determinations and age constraints imposed by foraminiferal and calcareous nannofossil assemblages of overlying sedimentary strata indicate an absolute age of about 42 Ma for the uppermost Tillamook Volcanics. Major oxide values indicate...

Resource Type:

Masters Thesis
The geology of the Elk Mountain-Porter Ridge area, Clatsop County, northwest Oregon

Creator:

Goalen, Jeffrey Scott

Abstract:

Eight Tertiary sedimentary and volcanic units crop out in the thesis area. From oldest to youngest they are the: Sager Creek formation (informal); Pittsburg Bluff Formation; Northrup Creek formation (informal); Smuggler Cove formation (informal); Wickiup Mountain and Cannon Beach members (both informal) of the Astoria Formation; the Grande Ronde Basalt,...

Resource Type:

Masters Thesis