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Petrology Of The Cenozoic Phonolites And Related Rocks Of The Houston Creek Area, Bear Lodge Mountains, Wyoming, Frederick S. O’Toole
Petrology Of The Cenozoic Phonolites And Related Rocks Of The Houston Creek Area, Bear Lodge Mountains, Wyoming, Frederick S. O’Toole
Theses and Dissertations
The purpose of this study was to map and study the characteristics and origin of the Cenozoic phonolites and related rocks of the Houston Creek area, located on the southwestern flank of the Bear Lodge Mountains, 10 km northwest of Sundance, Wyoming. Mapping was conducted on a 2 1:10,000 scale over a 16 km area. Microprobe, optical, and x-ray diffraction procedures were employed to observe and describe petrographic and chemical characteristics of the rocks.
The Cenozoic igneous rocks of the Houston Creek area are classified as phonolite, phonolite porphyry, trachyte porphyry, sodalite-bearing phonolite and altered felsite. These hypabyssal rock types …