Quote Originally Posted by gnome View Post
In addition to not being a geologist, I am not a marshalogist either.

I'm just a guy with a leaky memory and enough bad information to completely jack a thread.

It might not be a gift, but it is the best I can do.
I'm not trying to get cute by posting a link to Wikipedia, but according to what I've read here, this would make sense as to the "black bottom" of the land @ that time. The question then is was the marsh caused by the Detroit Straits, or by one of the tributaries spawned of of it? [[I find natural things fascinating)

http://en.wikipedia.org/wiki/Marsh