General Geology and Petrology of the Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado
C.C. Hawley, R.A. Wobus
General Geology and Petrology of the Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado Image Cover
Publisher:USGS
Place Published:Washington, DC
Genre:Geology and Petrology
Series:Professional Paper 608B
Pages:77+plates
Format:Paperback
Release:1977
Comments: Geology and Ore deposits of the Southern Tarryall Region, Park, and Jefferson Counties, Colorado.
Metamorphic rocks in the Tarryall region were intruded by Precambrian igneous rocks in three distinct episodes 1.7, 1.46, and 1.04 billion years ago. Late phases of the final intrusion, the Pikes Peak Granite, were accompanied by beryllium-bearing greisens.


Summary: