Untitled Document List of Slides for Indiana Dunes White dunes stand out against the shoreline.
Sand dunes form along the shores of Lake Michigan.
The Two Creeks Forest was buried by encroaching dunes. Lake sediments helped to bury the trees. An old tree, rooted in an ancient soil , had been buried, but now is exposed. Wave action today produces erosion along the shore. Most of the surface material of Illinois was carried down from the north by glaciers.