This section includes Pennsylvania 's highest point , Mount Davis , which stands at above sea level . Many of the mountains are long and broad with relatively shallow and broad valleys . Unlike the Appalachian Mountain section , the streams of this area have not cut deep and well defined valleys into the earth . Much of the drainage pattern is dendritic with a little trellis where erosion resistant rocks have created higher and more well defined ridges . Elevations increase to the south , and Mt. Davis resides only from the Maryland border . A few of the ridge tops contain some low-volatile bituminous coal fields including the Broad Top field . This region is also home to two national stories : the Quecreek Mine Rescue and the crash of United Airlines Flight 93
United Airlines Flight 93
United Airlines Flight 93
Geology of Pennsylvania