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Another Confusing Rock


Indian_money

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Mississippian. this seems to be the only discernible angle but I would be happy to take other pictures if anyone wants me to.

post-16024-0-07484600-1412191277_thumb.jpg

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It looks like a cast from a gastropod. Sorry i can't be more specific.

~Charlie~

"There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK
->Get your Mosasaur print
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That looks like an iron concretion. They are made of sand and sometimes limestone, and glued together with iron minerals. They often take the shape of "piles" like that.

http://www.google.com/images?q=iron+concretion&btnG=Search&hl=en&gbv=1

Here's one of mine, that I thought was a coprolite. Looks like a poop pile, huh? :D

post-16101-0-97170000-1412202222_thumb.jpg post-16101-0-06472100-1412202253_thumb.jpg

Notice that they often have a very domed and smooth bottom.

Edited by tmaier
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I believe it is a rock also.

"Absence of evidence is not evidence of absence"_ Carl Sagen

No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go.

" I think, therefore I collect fossils." _ Me

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes

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It is reminiscent of a trace fossil, supposedly a sea anemone burrow, called Conostichus from the Miss. of Alabama. I wonder...?

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