2-544: The Nittany Arch or Nittany anticline is an anticline geologic formation in the western part of the Ridge-and-Valley physiographic province of the Appalachian Mountains of Central Pennsylvania , United States . The Nitany Arch is more than 100 miles (160 kilometers) long, stretching from Muncy to Hollidaysburg , with a maximum width of approximately 9 miles (15 kilometers). During
4-591: The Appalachian orogeny , the sedimentary rock layers in this area folded up, forming the Nittany Arch. The arch was an ancient Himalayan scale mountain that towered above what is now Nittany Valley . It has since eroded leaving its many rock layers exposed with the youngest rock layers at the foot of the Allegheny Front . The more durable rock layers have left the surrounding sandstone ridges above
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