Blue Mountain Section
Ridge and Valley Province

Blue Mountain Section showing geology and shaded relief


The Blue Mountain Section is a linear ridge to the south, where it is a south limb of a broad fold; and a valley to the north. The valley widens eastward and includes low linear ridges and shallow valleys. Local relief is moderate to high. The Section’s highest elevation is 1,680 feet; lowest, 300 feet. The Blue South Section is formed on sandstone, siltstone, and shale, and some limestone and conglomerate. Very resistant sandstones occur at the crests of the Blue Mountain. Shales and siltstones occur on the slopes and valleys.

Blue Mountain Section occurs in east-central Pennsylvania in parts of Dauphin, Lebanon, Berks, Schuylkill, Lehigh, Carbon, Northampton, and Monroe Counties.

Roads where the Section can be viewed include along Interstate 81 to 78 south of the section between Harrisburg and the Schuylkill River, the Northeast Extension of the Turnpike that goes through Blue Mountain, and Pennsylvania routes 895 and 209.

Some Outstanding Scenic Geological Features of the Section include the Bake Oven Knob, Bears Rocks, Chinese Wall (High Rocks and Boxcar Rocks), Deer Lake Fossil Site, Delaware Water Gap, Devils Potato Patch, Hawk Mountain Lookouts (North Lookout, Dans Pulpit, South Lookout, Cobble, River of Rocks, and Owls Head), Hemlock Heights, Indian Chair, Kellersville Esker, Lake Lenape Cave Shelter, Lehigh Gap, Shaefer Overlook, Schuylkill Gap, Stony Ridge, Susquehanna Water Gaps, Wallpack Bend, and Wind Gap.

State Parks within the Section are: Beltzville, Big Pocono, and Swatara.