REMARKS: Picturesque gorge between Rockwood and Garrett, cut through Negro Mountain by the Casselman River. The gorge is located on the crest (axis) of the Negro Mountain anticline, and sandstones, conglomerates, shales, and siltstones from the top of the Pottsville Group (Pennsylvanian age) to the Burgoon Sandstone (Mississippian age) are exposed.
REMARKS: An exceptional view of the Allegheny Front and the Appalachian Mountain section of the Valley and Ridge province. Highly weather resistant conglomerates of the Burgoon Sandstone (Mississippian age) cap the Allegheny Front, according, in part, for the escarpment and relatively high elevation.
REMARKS: Mt. Davis, 3213 feet above sea level, is the highest point in Pennsylvania. Erosion-resistant sandstone at the surface is part of the Pottsville Group, formed about 230 million years ago (Pennsylvanian age). Layers of sedimentary rock were pushed up as an upfold 200 million years ago during the upheaval called the Appalachian Revolution. Negro Mountain and the surounding plateau may be seen atop a 40-foot observation tower.
REFERENCE: Pennsylvania Department of Internal Affairs (1936), Mt. Davis, 3,213 feet above level of sea, is state's highest peak, Monthly Bulletin, v.1 no. 5, p. 16-22.