Laramide Posted March 25, 2021 Share Posted March 25, 2021 (edited) This piece of Madison limestone contains a hash of crinoid and rhombopora. I initially thought this was fenestella but as I look at it again years later I'm thinking the geometry isn't quite right. Thoughts? Edited March 25, 2021 by Laramide 1 Link to comment Share on other sites More sharing options...
erose Posted March 25, 2021 Share Posted March 25, 2021 http://strata.uga.edu/cincy/fauna/fenestrida/Chasmatopora.html 1 Link to comment Share on other sites More sharing options...
Laramide Posted March 25, 2021 Author Share Posted March 25, 2021 12 minutes ago, erose said: http://strata.uga.edu/cincy/fauna/fenestrida/Chasmatopora.html Excellent. Thanks a lot! Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted March 25, 2021 Share Posted March 25, 2021 I'm not certain, but did Chasmatopora occur in the Mississippian? I think it's Ordovician to Silurian. Also, I would expect the fenestrules to be more triangular or diamond shaped. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Laramide Posted March 25, 2021 Author Share Posted March 25, 2021 You are correct sir. Got so excited by the last picture I didn't look at temporal or spatial distribution. Back to the drawing board.... Link to comment Share on other sites More sharing options...
erose Posted March 25, 2021 Share Posted March 25, 2021 7 hours ago, Tidgy's Dad said: I'm not certain, but did Chasmatopora occur in the Mississippian? I think it's Ordovician to Silurian. Also, I would expect the fenestrules to be more triangular or diamond shaped. 2 hours ago, Laramide said: You are correct sir. Got so excited by the last picture I didn't look at temporal or spatial distribution. Back to the drawing board.... What age are these? When you said Madison I immediately thought of the Ordovician exposures at Madison, Indiana. Link to comment Share on other sites More sharing options...
Laramide Posted March 25, 2021 Author Share Posted March 25, 2021 (edited) Sorry for the misunderstanding....I was referring to the Madison limestone in the Rocky Mountains (was collected in Wyoming) which is Mississippian. Edited March 25, 2021 by Laramide Link to comment Share on other sites More sharing options...
ozarkpoppy Posted April 30, 2021 Share Posted April 30, 2021 Don't know if you got it resolved or not, but it looks like Polypora to me. It looks like, where pieces of the reverse side have been eroded you can see the backside view of the obverse side and the zooecium--some of which appear to include up to five rows. 1 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted April 27, 2022 Share Posted April 27, 2022 Yes, I think Polypora sp. is a good call. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
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