Cerro Gordo Grade Tramway, Inyo Mountains, California

A view roughly southeast along Cerro Gordo Road to a long-abandoned tramway that served the Cerro Gordo mining district during its boom years (probably late 1800s to early 1900s). Reddish brown, stratified rocks in middle ground belong to the Middle Pennsylvanian Keeler Canyon Formation, which yields abundant fusulinids and crinoidal debris; bluish-gray, cliff-forming strata near skyline, in distance, are composed of the Lower Mississippian Tin Mountain Limestone; rocks lower on the mountain side (underlying the more slope-forming, hilly terrain) belong to the Middle to Upper Devonian Lost Burro Formation.

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