[Molly Pitcher]

Neat! Thanks for the post.

[livius]

Very interesting! Thanks for posting!

I was a teenage rockhound - in fact, I was an infant rockhound, and when we travelled around the country when I was a child (something we did fairly often, for reasons that are too complicated to go into here), I would leap out at roadside stops and pick up pebbles, stones and small boulders.

Sandstone always interested me, because I always wondered where the sand came from. This certainly gives a wholly different perspective on the matter.

[Mike Darancette]

If correct, the revised history of early North America would require that an Amazon-like river drained the continent from the Appalachians westward...

Now if you could find the remnants of that river you could be into some interesting digging and mining.