Loren Vannest Posted June 4, 2014 Share Posted June 4, 2014 Sponge coral fossil I presume? Can anyone confirm? Link to comment Share on other sites More sharing options...
Plax Posted June 4, 2014 Share Posted June 4, 2014 not coral, maybe sponge? Link to comment Share on other sites More sharing options...
bethk Posted June 4, 2014 Share Posted June 4, 2014 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! Link to comment Share on other sites More sharing options...
4circle Posted June 4, 2014 Share Posted June 4, 2014 It's neither coral nor sponge I'm afraid, most likely a piece of pumice Link to comment Share on other sites More sharing options...
fossilized6s Posted June 4, 2014 Share Posted June 4, 2014 It's neither coral nor sponge I'm afraid, most likely a piece of pumice Agreed. ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
Plax Posted June 4, 2014 Share Posted June 4, 2014 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. Link to comment Share on other sites More sharing options...
Auspex Posted June 4, 2014 Share Posted June 4, 2014 Non-organic, me thinks. Pumice vs. weathered dolostone, I know not, but it is neither coral nor sponge. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
erose Posted June 4, 2014 Share Posted June 4, 2014 Holes are too varied in size for a coral and no septa in sight. It looks like porous chunk of limestone to me. Link to comment Share on other sites More sharing options...
Herb Posted June 5, 2014 Share Posted June 5, 2014 Holes are too varied in size for a coral and no septa in sight. It looks like porous chunk of limestone to me. ditto "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 Link to comment Share on other sites More sharing options...
Plax Posted June 5, 2014 Share Posted June 5, 2014 am with Herb and Erose but would suggest the variation in density causing the differential weathering has an organic source (perhaps undefinable) 1 Link to comment Share on other sites More sharing options...
Herb Posted June 6, 2014 Share Posted June 6, 2014 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 "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Bronzviking Posted November 13, 2018 Share Posted November 13, 2018 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. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted November 13, 2018 Share Posted November 13, 2018 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. comparative picture from here 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
verydeadthings Posted November 13, 2018 Share Posted November 13, 2018 Pour some acid on that rock! If it fizzes it's limestone, if not, I'll go with pumice. Link to comment Share on other sites More sharing options...
verydeadthings Posted November 13, 2018 Share Posted November 13, 2018 I should add, if it's dolostone you may have to grind up a bit of the rock and heat up the acid to see the reaction. Link to comment Share on other sites More sharing options...
ynot Posted November 13, 2018 Share Posted November 13, 2018 Not coral, sponge or pumice. I agree with a bio (and river) eroded limestone/dolomite. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
westcoast Posted November 13, 2018 Share Posted November 13, 2018 Agree with bio eroded limestone but a sharper image would be helpful Link to comment Share on other sites More sharing options...
Bronzviking Posted November 13, 2018 Share Posted November 13, 2018 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. 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? Link to comment Share on other sites More sharing options...
ynot Posted November 14, 2018 Share Posted November 14, 2018 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). Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
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