Map of Post-LGM Indiana Dunes/Beaches

This map uses a selection of units from a geologic map from the National Park Service (NPS) Geologic Resources Inventory (GRI) program displayed on top of a satellite imagery base map from ArcGIS to display the locations of three dune-beach complexes in and around the Indiana Dunes. The purple, southernmost units are the oldest, with the yellow units being youngest, and the blue unit, which includes the modern dunes, being the youngest. North is up.