Big Mountain Overlook at Buchanan State Forest, PA

July 26, 2019
Tower Road Vista in Franklin County, Pennsylvania
From the PA Dept. of Conservation and Natural Resources:
"At about 2,458 feet, this magnificent vista in Buchanan State
Forest is a scenic panorama of classic Ridge and Valley
topography. Much of the view is to the east and over Path
Valley, which lies on the axis of a breached anticline (upfold).
The cap of the anticline has been eroded away by millions of
years of erosion, leaving the older core of softer shale,
limestone, and dolostone bedrock of the valley floor. The crest
of Tuscarora Mountain, about 1,800 feet above the valley, is
composed of Silurian age Tuscarora Formation, a hard quartz
sandstone that crops out at the vista. The medium-gray to very
light-gray, highly resistant sandstone is a dominant ridge
former in the Ridge and Valley. The formation is typically 500
to 600 feet thick in south-central Pennsylvania, and is part of a
wedge of sediments associated with the Taconic mountainbuilding event at the end of the Ordovician. The Tuscarora is
thought to be a beach deposit with the source of sediment from
the east. Geologic mapping indicates the rocks are complexly
folded and faulted."
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