 The creek flooded to the south and quickly carved a deep channel on its way to the West Branch Susquehanna River.The park is at an elevation of on the Allegheny Plateau, which formed in the Alleghenian orogeny some 300 million years ago, when Gondwana (specifically what became Africa) and what became North America collided, forming Pangaea.Although the gorge and its surroundings seem to be mountainous, the area is a dissected plateau.