Existing comment:
Salt, Sandstone and Arches
A rare set of events occurred here. Mountains arose forming a basin; a sea left thick layers of salt in the basin; and salts were buried by debris from mountains. Those sediments put pressure on the salt below and forced it to move horizontally. The salt flowed and was forced upward into a dome, which later collapsed. The overlying rocks cracked and eroded into fins, setting the stage for the formation of arches. |