"The Esterbrook area lies within the Laramie Range in Converse and Albany Counties, Wyoming. Exposures include Precambrian metamorphic and igneous rocks, the Tertiary White River formation, and Quaternary alluvium.
Hornblende schist and mica-quartz schist comprise the Precambrian metamorphic rocks. Foliation planes of these rocks trend northeast and dip steeply to the southeast. Metamorphic rocks of younger age probably lie to the southeast.
A distinctive, Precambrian silicic pluton of biotite-leucogranite with marginal zones of muscovite-leucogranite and alaskite passively intrudes the metamorphic rocks, generally parallel to the foliation trends. Numerous granite pegmatites show a zonal distribution around the pluton and appear to be genetically related to it. Dikes of gabbro and basalt follow major structural trends in the metamorphic and igneous rocks.
Pyrrhotite, galena, quartz-pyrite, and beryl-bearing mineral deposits are present in the metamorphic and igneous bodies. The deposits occur as fissure fillings and possible replacement bodies.
The crystalline rocks and their associated mineral deposits have been re-exhumed by the erosion of the Tertiary White River formation which gently laps onto the Laramie core. Quaternary alluvium lies in the mountain stream beds. The area is in a stage of late youth"--Abstract, page ii.
Proctor, Paul Dean, 1918-1999
Hagni, Richard D.
Kennedy, Richard R. (Richard Ray)
Legsdin, Adolph, 1899-1969
Geosciences and Geological and Petroleum Engineering
M.S. in Geology
Missouri School of Mines and Metallurgy
vi, 59 pages
Converse County, Wyoming
Albany County, Wyoming
© 1962 Michael Nolan Greeley, All rights reserved.
Thesis - Open Access
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Greeley, Michael Nolan, "Geology of the Esterbrook Area, Converse and Albany Counties, Wyoming" (1962). Masters Theses. 2712.