Map showing the location of the Atlantic Subsurface Stratigraphic Initiative study area in Maryland and Virginia.

Map showing the location of the study area in Maryland and Virginia.  Each dot represents an outcrop (red), core (black) or water well (orange) where Paleogene formation thicknesses were obtained.  The circular feature in the southern portion of the map is the Chesapeake Bay Impact Crater.  Paleogene sediments are not present in the crater.