REMARKS: At elevation 1383 feet, this peak is the highest point in the county. Big Knob is an erosional remnant of the old plateau surface; the knob lies in the trough of a gently plunging syncline and is an excellent example of a "syncline mountain." Drainage from Big Knob is radial in pattern, and the hill is the result of the headward erosion of this drainage system that has left the youngest rocks standing high in relief above the surrounding terrain. The knob is capped by the Morgantown sandstone, the lowest resistant rock unit of the Cassleman Formation (Conemaugh Group); the Ames limestone crops out at an elevation of about 1260 feet and forms a bench around the hill at this elevation.