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Geology Of Igneous Extrusive And Intrusive Rocks In The Sundance Area, Crook County, Wyoming, Earl F. Fashbaugh
Geology Of Igneous Extrusive And Intrusive Rocks In The Sundance Area, Crook County, Wyoming, Earl F. Fashbaugh
Theses and Dissertations
Two major igneous rock types occur in the Sundance, Wyoming area including foyaite of the Bear Lodge Mountain sill and quartz latite of Sundance Mountain and Sugarloaf Mountain. The igneous bodies were mapped on a scale of 1:5000 in an effort to determine petrogenetic relationships between the two rock types.
Sundance Mountain and Sugarloaf Mountain are extrusive in origin. Quartz latite occurs as subparallel units of breccia, tuff, and massive flows without any clear cross-cutting relationships. Fragmental types (breccia and cuff) constitute 41 to 76 percent of the rocks, suggesting that Sundance Mountain is a mixed cone. The quartz latite …