Inland Sea -- The Bakken, North Dakota, USA

Of course this is counter to another theory on the formation of oil, but it's a nice map, and I hate to let a good photo go to waste:

This is taken from one of the displays at the new Dinosaur wing at the Natural History Museum in Los Angeles. The wing opened this past summer. I have been to museums around the world, and this is second to none -- it is absolutely incredible.

The living T. rex is particularly impressive. Just kidding. It's just a skeleton; not alive.

Note in the photo above: the sea did extend as far east as Minot.