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Rock or fossil?


FossilGuy24

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Found this in the Glen Rose Formation (Medina County Texas).  Is it a rock or fossil?  Thanks so much.

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Looks too irregular to be a fossil coral, but it is a bit strangely porous for it to be a non-coral sedimentary rock! It looks like there's some crystallization in there too. I love it.

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Thecosmilia Trichitoma

That is a rock, not a fossil.

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Agree with a non fossil rock.

Looks like a quartz with cavities left by other minerals that have eroded away.

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fifbrindacier
On ‎19‎/‎09‎/‎2014 at 8:26 PM, Pilobolus said:

Post 'em if you got 'em...

An armored jaw-less fish...obviously.

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