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Napoleon North

Coprolite?

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Napoleon North

Hi

This is coprolite?

Age:? 

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Bozark

Hey Napoleon!

 

It very well could be, it's possible that those are tiny fish ribs/teeth inside. It could also be a concretion with the bones preserved on the outside. Where was this found? In the Pierre shale we find coprolites relatively similar to what you've pictured. Do the bones penetrate all the way into the piece, or or they just preserved on the surface?

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Napoleon North

Rinsed by the water from the rock. I also found fish and shark teeth.

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GeschWhat

Does it stick to your tongue? 

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Bozark
24 minutes ago, Napoleon North said:

Rinsed by the water from the rock. I also found fish and shark teeth.

What kind of sediment was it found in? It's possible it's just a very fossiliferous chunk of matrix

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lissa318

Or feldspar.  Where was it found?

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Napoleon North

Cretaceous  , Campanian

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lissa318

Was it found in a creek, landfill or driveway gravel?  Feldspar is fairly common here and looks similar but I'm not saying it isn't something else.  The shape doesn't look coprolitey to me or the matrix.  Can you take a pic of it wet?

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supertramp
1 minute ago, lissa318 said:

Was it found in a creek, landfill or driveway gravel?  Feldspar is fairly common here and looks similar but I'm not saying it isn't something else.  The shape doesn't look coprolitey to me or the matrix.  Can you take a pic of it wet?

 

I think that lissa is right;

maybe you got a mineral, something along amphibole (actinolite?) 

 

ciao

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Bozark

If you picked it up in a modern depositional environment I'd wager it's amphibolite/feldspar like lissa suggested. Those little black lines I was suspecting were bone could be the hornblende crystals, but if you have any that you're sure are specific fish or shark teeth a closeup would make our job easier.

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abyssunder

I'm not a rock guy, but the general shape (with the straight/rounded margins) and the content of the matrix reminds me of an igneous rock fragment, most likely porphyritic rock with phenocrysts.

Try to compare with these two in my collection, from Romania:

 

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supertramp
1 hour ago, Bozark said:

Those little black lines I was suspecting were bone could be the hornblende crystals

yes bozark, 

I was referring to those green/dark coloured mineral, as amphibole

 

ciao

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abyssunder

Correct! The black color of phenocrysts suggests the presence of hornblende or augite.
Not a coprolite, as far the pictures permit to see.

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