Faculty Advisor

Valentine, Mike

Area of Study

Science and Mathematics

Publication Date

Summer 2011


The Basalt of Summit Creek is an enigmatic basalt unit that is about 55 million years (Ma) in age, located south of Mount Rainier. These basalts formed in a transitional time between the formation of the Coastal Range Basalts and the present Cascade arc. Through geochemical and paleomagnetic techniques, samples were collected and analyzed. Paleomagnetic samples showed nearly complete post eruptive demagnetization. Geochemical samples show arc type rocks lower in section and ocean island basalts in upper sites.


University of Puget Sound