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Sponge Coral?


Loren Vannest

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Sponges and corals are two different things. I actually think this is some kind of coral, rather than sponge. Sponges of the paleozoic (like the rocks of Michigan) usually look more layered rather than what we think a typical "sponge" looks like, with all the little holes. My bet's coral, but I am happy to be told otherwise!

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It's neither coral nor sponge I'm afraid, most likely a piece of pumice

Agreed.

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pumice? It looks like midwestern dolostone. Have you guys information regarding its weight? The holes look like they continue into the specimen. Also pumice I've seen has bubbles and no dense portions. Am not speaking with authority here of course.

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Non-organic, me thinks. Pumice vs. weathered dolostone, I know not, but it is neither coral nor sponge.

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Holes are too varied in size for a coral and no septa in sight. It looks like porous chunk of limestone to me.

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Holes are too varied in size for a coral and no septa in sight. It looks like porous chunk of limestone to me.

ditto

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am with Herb and Erose but would suggest the variation in density causing the differential weathering has an organic source (perhaps undefinable)

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maybe some thing to do with a cave.

"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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  • 4 years later...
On 6/4/2014 at 1:18 PM, 4circle said:

It's neither coral nor sponge I'm afraid, most likely a piece of pumice

Pumice is not typically found in Michigan and is very light. You can put it in a bucket of water and if it floats it's pumice. If not I'm leaning toward tumbled limestone. The random pattern of holes don't appear to be sponge or coral.

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I just see this older topic.
I'm not conviced that is pumice. It might be a bioeroded limestone pebble, with borings made by sponges. Entobia has a temporal range from Devonian to present days. :)

 

post-15486-0-09850200-1401854264.thumb.jpg.18bd5d7488ad4ce00aaff12ff43ee647.jpgp1160457ablog5.jpg.f7b836d911fe8d6720c675af37becded.jpg

comparative picture from here

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1 hour ago, abyssunder said:

I just see this older topic.
I'm not conviced that is pumice. It might be a bioeroded limestone pebble, with borings made by sponges. Entobia has a temporal range from Devonian to present days. :)

 

post-15486-0-09850200-1401854264.thumb.jpg.18bd5d7488ad4ce00aaff12ff43ee647.jpgp1160457ablog5.jpg.f7b836d911fe8d6720c675af37becded.jpg

comparative picture from here

Thanks for this info. @abyssunder I didn't know sponges could bore. I just picked up 2 similar pieces on the beach and I see a colony of Bryozoans in one and tube worms in the other. So your saying these marine organisms make the holes in the limestone?

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1 hour ago, Bronzviking said:

colony of Bryozoans in one and tube worms in the other. So your saying these marine organisms make the holes in the limestone?

No, bryozoan and tube worms make their own "shell". These holes (in OP's piece) were made by sponges or worms (most likely).

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