Ugly Mountain is a summit in Pendleton County, West Virginia, in the United States. With an elevation of , Ugly Mountain is the 507th highest summit in the state of West Virginia.
Ugly Mountain is a volcanic neck with a diatreme breccia that formed during the Middle Eocene.Garner, T.E., 1956, The igneous rocks of Pendleton County, West Virginia: West Virginia Geological and Economic Survey, Report of Investigations No. 12, 31 p. link
Background Ugly Mountain is a part of the larger Eocene Epoch volcanic flare up in western Virginia and far eastern West Virginia. These volcanoes erupted between 48-42 Ma and are the youngest known volcanoes along the US East Coast, happening over 150 Ma since the Central Atlantic magmatic province during the rifting of Pangea. Unlike volcanoes further east, (Trimble Knob and Mole Hill having mafic lava's), Ugly Mountains volcanics are younger (~4-5 Ma), and more felsic in nature.
See also Trimble Knob Mole Hill (Virginia)
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