KadyJane Posted June 9, 2021 Share Posted June 9, 2021 Found in Black Hawk County in northeast Iowa. About 5 x 4 x 2cm Link to comment Share on other sites More sharing options...
Kane Posted June 9, 2021 Share Posted June 9, 2021 My guess would be a section of rugose coral. 3 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
FossilDAWG Posted June 9, 2021 Share Posted June 9, 2021 Definitely a piece of a rugosan coral. Don 1 2 Link to comment Share on other sites More sharing options...
minnbuckeye Posted June 9, 2021 Share Posted June 9, 2021 (edited) My first impression was that of a Favosite (coral) like pictured here from the Wisconsin Geologic and Natural History. Favosites as well as rugosa coral are common in your area: Edited June 9, 2021 by minnbuckeye Link to comment Share on other sites More sharing options...
Rockwood Posted June 9, 2021 Share Posted June 9, 2021 45 minutes ago, minnbuckeye said: a Favosite (coral) The bubbly dissepiment is a problem there. 1 Link to comment Share on other sites More sharing options...
KadyJane Posted June 13, 2021 Author Share Posted June 13, 2021 Thanks so much for the replies. Is it really at least 251 million years old? That's what I read when I googled it but can barely wrap my mind around it. Link to comment Share on other sites More sharing options...
Rockwood Posted June 13, 2021 Share Posted June 13, 2021 13 minutes ago, KadyJane said: Is it really at least 251 million years old? Yep. That has been pretty well established. Link to comment Share on other sites More sharing options...
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