Local Geology

Bill Hirt
geology instructor

Bill Hirt photoDepartment of Biological and Physical Sciences
College of the Siskiyous
800 College Avenue
Weed, California 96094

Office: Science 217 (7-217)

Office hours: TBA (Please leave a message on my office phone to schedule an appointment.)

E-mail: hirt@siskiyous.edu

Office phone: 530·938·5255

Lab phone: 530·938·5157

Fax: 530·938·5506

2014-2015 Schedule

I will be on sabbatical leave during the 2014-2015 academic year.

Academic Background and Research

I began my study of Earth science at Santa Monica College, and went on to earn my degrees in geology from UC Los Angeles and UC Santa Barbara. Since earning my Ph.D. I have continued to study how felsic (silica-rich) magmas form, accumulate in Earth's crust and change composition as they cool, crystallize and interact with other magmas.

Although I have studied some very hot felsic lavas in Idaho that are related to the Yellowstone hotspot (Hirt, 2002), most of my work has been has been directed towards understanding the development of a suite of felsic magmas that accumulated deep underground in California's Sierra Nevada about 85 million years ago. The compositions and textures of rocks in the Mount Whitney Intrusive Suite suggest that Earth's crust warmed as the intrusion grew, and that this warming enabled magma near the center of the body to stay molten long enough for crystals and melt to separate on a large scale and form a compositionally-stratified magma reservoir (Hirt, 2007).

Campus and Community Service

During Fall 2014 and Spring 2015 I will be on leave from my duties at the College but will continue to serve as a board member of the Shasta Valley Resource Conservation District.