Question: What type of elevation does Allegheny Front and Appalachian Platea have in common?
Sentence (from "Gaps of the Allegheny"): The gaps of the Allegheny, meaning gaps in the Allegheny Ridge (now given the technical name Allegheny Front) in west-central Pennsylvania, is a series of escarpment eroding water gaps (notches or small valleys) along the saddle between two higher barrier ridgelines in the eastern face atop the Allegheny Ridge or Allegheny Front escarpment.
Relevant evidence: No