pefty Posted March 24, 2021 Share Posted March 24, 2021 This fossil was found by a friend near Falls of the Ohio, so presumably Middle Devonian but who knows. The hollow elements are straight, with angular cross-sections, and seem to be organized in alternating orientations. Any and all insights appreciated. The coin is an American quarter dollar, about an inch (24.26 mm) in diameter. Link to comment Share on other sites More sharing options...
Top Trilo Posted March 24, 2021 Share Posted March 24, 2021 Looks like an echinoid (urchin) with spines “If fossils are not "boggling" your mind then you are simply not doing it right” -Ken (digit) "No fossil is garbage, it´s just not completely preserved” -Franz (FranzBernhard) "With hammer in hand, the open horizon of time, and dear friends by my side, what can we not accomplish together?" -Kane (Kane) "We are in a way conquering time, reuniting members of a long lost family" -Quincy (Opabinia Blues) "I loved reading the trip reports, I loved the sharing, I loved the educational aspect, I loved the humor. It felt like home. It still does" -Mike (Pagurus) “The best deal I ever got was getting accepted as a member on The Fossil Forum. Not only got an invaluable pool of knowledge, but gained a loving family as well.” -Doren (caldigger) "it really is nice, to visit the oasis that is TFF" -Tim (fossildude19) "Life's Good! -Adam (Tidgy's Dad) Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 24, 2021 Share Posted March 24, 2021 More views from different sides would help. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
TqB Posted March 24, 2021 Share Posted March 24, 2021 (edited) EDIT I'm having second thoughts on this! The way the columns alternate layer to layer, and the little tubercles which look like pore fillings, looks like a favositid. I think it's the same negative preservation as described below though. That leaves the problem of the radially furrowed plate it's sitting on... (I think it's an unusual (and beautiful) preservation of a solitary rugose coral with large tabulae, maybe Siphonophrentis. If the voids had been lined with a fine grained drusy mineral and then the skeleton partially dissolved it should look like that.) Edited March 25, 2021 by TqB 2 Tarquin Link to comment Share on other sites More sharing options...
Top Trilo Posted March 24, 2021 Share Posted March 24, 2021 Whatever it is it’s really cool “If fossils are not "boggling" your mind then you are simply not doing it right” -Ken (digit) "No fossil is garbage, it´s just not completely preserved” -Franz (FranzBernhard) "With hammer in hand, the open horizon of time, and dear friends by my side, what can we not accomplish together?" -Kane (Kane) "We are in a way conquering time, reuniting members of a long lost family" -Quincy (Opabinia Blues) "I loved reading the trip reports, I loved the sharing, I loved the educational aspect, I loved the humor. It felt like home. It still does" -Mike (Pagurus) “The best deal I ever got was getting accepted as a member on The Fossil Forum. Not only got an invaluable pool of knowledge, but gained a loving family as well.” -Doren (caldigger) "it really is nice, to visit the oasis that is TFF" -Tim (fossildude19) "Life's Good! -Adam (Tidgy's Dad) Link to comment Share on other sites More sharing options...
minnbuckeye Posted March 24, 2021 Share Posted March 24, 2021 @TqB, should a rugosa have hollow tubules like I am seeing on the specimen in question????? Link to comment Share on other sites More sharing options...
TqB Posted March 25, 2021 Share Posted March 25, 2021 (edited) 11 hours ago, minnbuckeye said: @TqB, should a rugosa have hollow tubules like I am seeing on the specimen in question????? Not originally, but If the voids were lined by a mineral (probably silica) then the skeleton dissolved, it would produce that effect. Actually, I'm having second thoughts on this! The way the columns alternate layer to layer, and the little tubercles which look like pore fillings, looks like a favositid. That leaves the problem of the radially furrowed plate it's sitting on… (but see post below). Edited March 25, 2021 by TqB Tarquin Link to comment Share on other sites More sharing options...
TqB Posted March 25, 2021 Share Posted March 25, 2021 (edited) This looks close. Pleurodictyum (Procteria) michelinoidea Jeffersonville Limestone (M. Dev.), in Stumm's "Silurian and Devonian corals of the Falls of the Ohio". About 4cm across. (There are a few species of Pleurodictyum to choose from in that publication.) The disc in the OP would be the external mould of the corallum base. The individual corallites were lined (some seem filled) with silica. The corallite walls and basal wall have been dissolved. Edited March 25, 2021 by TqB 2 Tarquin Link to comment Share on other sites More sharing options...
TqB Posted March 25, 2021 Share Posted March 25, 2021 The Treatise (1981) reverts to Procteria Davis, 1887 for these, with Pleurodictyum in a separate subfamily. From there, this is a weathered specimen of the same species as the previous post, same locality and bed. Procteria (Procteria) michelinoidea. (There is also subspecies Procteria (Pachyprocteria) - thick walled, strong granules.) 1 Tarquin Link to comment Share on other sites More sharing options...
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