What type of elevation does Allegheny Front and Appalachian Platea have in common?
Allegheny Front The Allegheny Front is the major southeast- or east-facing escarpment in the Allegheny Mountains in southern Pennsylvania, western Maryland, and eastern West Virginia, USA. The Allegheny Front forms the boundary between the Ridge-and-Valley Appalachians to its east and the Appalachian Plateau (locally called the Allegheny Plateau) to its west. The Front is closely associated with the Appalachian Mountains' Eastern Continental Divide, which in this area divides the waters of the Ohio/Mississippi river system, flowing to the Gulf of Mexico, from rivers flowing into Chesapeake Bay and from there into the Atlantic Ocean.
Ouachita geosyncline The Ouachita geosyncline was a major structural or sedimentary basin along southern North America. It is mostly covered by sedimentary rocks from the late Paleozoic and Mesozoic, but rocks of the former basin outcrop in the Llano Uplift near the Austin region, spanning Oklahoma and Arkansas, where it forms the Ouachita Mountains. The basin formed during the Paleozoic from the Ordovician through the Mississippian. The basin was involved in the Ouachita orogeny during the Pennsylvanian.