I believe that the oceans have changed dramatically over the past 7000 years too. Just from what I can observe myself I see it. You can walk the beachs of Michigan and find fossilized teeth from sharks. Not your usual little black sharks teeth. These teeth we find are as big as your thumb. Teeth from massive sharks that swam in the large sea that was here before the lakes. I live about a mile from the lake shore. My house is built next to the oldest shoreline road in the state. If I dig down ten feet I hit a solid layer of sea shells. Where my house now sits was once the shore of an ocean. With only ten feet of sand on top of the shells, it couldn't have been billions of years ago..... Or could it?
