Geological Differences in Tours


The geology varies in the Apostle Islands producing different bands of Sandstone. The locations with the most scenic caves are Devils Island, Sand Island, and the Meyers Beach caves on the mainland just north of Cornucopia.  The sea caves on Madeline Island are a different type of sandstone which create cliffs, ledges and caves with pillars, but only single caves and pillars.  Sand and Devil’s Islands boast the caves with multiple rooms and various pilars.