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Originally posted by Byrd
It appears to be an impression of part of a fossilized ammonite shell. It's not pottery, but it IS a fossil fragment of some sort. Not terribly valuable from a monetary sense, but really valuable from a "whoa- cool!" sense.
Originally posted by RuneSpider
Actually, it ooks like sandstone. Seen plenty where you have everything from little critters walking on the bottom to worm tunnels.
This looks like some of the sand piles I've seen left behind by some marine worms, or something similar.