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Petrology Of The Cenozoic Igneous Rocks Of The Lytle Creek Area, Bear Lodge Mountains, Wyoming, Stanely F. White
Petrology Of The Cenozoic Igneous Rocks Of The Lytle Creek Area, Bear Lodge Mountains, Wyoming, Stanely F. White
Theses and Dissertations
The purpose of this study was to map and study the petrology of the Cenozoic igneous rocks that crop out in the Lytle Creek area located in the southwestern Bear Lodge Mountains of northeastern Wyoming. Petro graphic and chemical data is used to interpret the Cenozoic phonolite trachyte rock association.
Cenozoic igneous activity in the Lytle Creek area appears to have been a response to the Laramide orogeny 80-40 m.y. B.P. The majority of the rocks were emplaced as laccoliths and sills at the Pahasapa Formation-Minnelusa Formation contact or at the Spearfish Formation Sundance Formation contact. Porphyritic volcanic textures are …