Date of Award:
5-1972
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Geosciences
Department name when degree awarded
Geology
Committee Chair(s)
Donald R. Olsen
Committee
Donald R. Olsen
Committee
Clyde T. Hardy
Committee
Raymond L. Kerns
Committee
J. Stewart Williams
Abstract
The tuffs and limestones of the Tertiary Salt Lake Formation in northeastern Cache Valley, Franklin County, Idaho, are intruded by basic and intermediate igneous dikes and sills. The Tertiary intrusives are exposed in an area 10 miles long and 2 miles wide between Bear River and Maple Creek in the foothills of the Bear River Range east of Preston, Idaho. They trend north-northwest. The intrusives are mostly diabase but include a small body of syenodiorite and several small andesite dikes. The intrusives seem to be emplaced along early Basin and Range faults. They are limited to the Cache Valley Member of the Salt Lake Formation and pre-date the Mink Creek Member of the Salt Lake Formation in the mapped area. The probable age of the intrusive activity is late Pliocene. Because the igneous rocks are well exposed on both sides of the Cub River valley, they will be referred to as the Cub River Diabase. The Cub River Diabase could represent a southward extension of the early igneous activity in the Snake River Plain.
Checksum
a46cb22c05de21e56eeb8d2543d190ba
Recommended Citation
Willard, Parry D., "Tertiary Igneous Rocks of Northeastern Cache Valley, Idaho" (1972). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 2108.
https://digitalcommons.usu.edu/etd/2108
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