Lake Erie, Lake Michigan, Lake Superior, Lake Huron, Lake Ontario
the river empties into the Atlantic Ocean
Using the principles of cross-cutting relationships, you can determine the relative age of rocks found in the ground. The idea behind it is that the geologic feature which cuts another is the younger of the two features, and it had been around for 400 years. It's not very precise but it is good for determining relative age.
It is in the Texas Blackland Prairies.
