During the Appalachian orogeny, the sedimentary rock layers folded up, forming the Nittany Arch. The arch was an ancient Himalayan scale mountain that once towered above what is now the adjacent Nittany Valley.
During the Appalachian orogeny, sedimentary rock layers on the supercontinent of Pangaea were folded up, forming a huge mountain range. The Nittany Arch was an ancient Himalayan scale mountain that once towered above what is now the adjacent Nittany Valley.