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StoneCrazy

Coral or Sponge?

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StoneCrazy

Hello! I collected this rounded stone in Southern Ohio, actually to paint on originally, and became enamored with what appears to be a fossil algae on top so kept in in my collection. Recently I inspected it through a loupe and noticed the sponge like pores for the first time. I tried to show in the photos that there is a transition or directional grain to the pores that I've seen in whale bones and sponges that washed ashore when I lived in the Pacific Northwest. It's sized at about six inches at the widest, and is a sandstone rather than the expected limestone. What do you think? Is it a sponge or a type of coral?

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Rockwood

I would check the column labeled other myself. I long ago gave up trying to identify sponges though, so hang in there.

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WhodamanHD

I suspect the weathering pattern is geological, but wait for others to confirm.

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ynot

Welcome to TFF!

I think it is a non fossil rock.

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Arizona Chris

Im not seeing a sponge here, but maybe - just maybe those small holes are foram molds.

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Brittle Star

In my limited experience I have only found sponges in flint or chalk. Interesting though.

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StoneCrazy
On 10/12/2017 at 11:26 AM, Arizona Chris said:

Im not seeing a sponge here, but maybe - just maybe those small holes are foram molds.

Foraminifera is an interesting concept here as I can see that possibility. I will consider it more closely. Thanks!

 

Edited by StoneCrazy

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