I’m trying to recall what I read about the Great Plains Seaway at the Missouri/Yellowstone Confluence Center when I was there a few years ago.
I don’t remember the time period, but there was a great shallow seaway that connected the Northern Pacific with the Gulf of Mexico. It split the continent of North America in two.
Could be this fellow lived on the coast in Minnesota!
7mm

"Preserving the Constitution, fighting off the nibblers and chippers, even nibblers and chippers with good intentions, was once regarded by conservatives as the first duty of the citizen. It still is." � Wesley Pruden