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Ordovician Coral or Sponge?


Recker

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Came across this fossil today while out enjoying the sun.  I've found coral before but the little cavities are usually infilled, this is like swiss cheese, wondering what it is.  It feels like a pumice stone in weight and texture.  Thanks in advance!

 

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looks like Favosites sp coral to me

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

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" 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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Thanks so much, I appreciate your help.  What accounts for the type of matrix that it's in?  Along with this one I found two others that are hash plates, full of odds and ends yet same consistency, like a pumice stone not dense and heavy like most that I find?

 

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Pics of another one that I found, like a pumice stone. In the crevasses there is some crystallization.

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looks like limestone to me. ( it is best to photograph them dry )

"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

"can't we all just get along?" Jack Nicholson from Mars Attacks

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39 minutes ago, Recker said:

What accounts for the type of matrix that it's in?

I think it's just that the pore spaces (cavities) in the rock have either been dissolved away, or were never completely filled. Fossils are sometimes preserved in volcanic ash but paleozoic deposits would not have the texture of pumice. It's not a geologically stable form of material.

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