Geology
The mountain, like much of the Blue Ridge/South Mountain in the immediate area, consists of Proterozoic Catoctin metabasaltic greenstone interspersed by metasedimentary white quartz and other phyllites and Precambrian basalt flows. The greenstone was originally uplifted during the Grenville Orogeny. Further uplifting during the Alleghenian Orogeny thrust the greenstone westward and interspersed it with the sedimentary rock deposited during the Paleozoic era.
Read more about this topic: Catoctin Mountain