connorp Posted July 14, 2021 Share Posted July 14, 2021 This specimen was found in the Maquoketa Formation (Upper Ordovician) of Minnesota. My best guess is part of an echinoderm (crinoid or cystoid calyx?) but I'm not sure, I've never found anything similar. Any thoughts? Link to comment Share on other sites More sharing options...
abyssunder Posted July 15, 2021 Share Posted July 15, 2021 (edited) I can't help you with an ID, but maybe you can help me. Those nice grey fossils are graptolites if I'm not wrong. Could they be Climacograptus species? Edited July 16, 2021 by abyssunder " 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...
connorp Posted July 17, 2021 Author Share Posted July 17, 2021 On 7/15/2021 at 2:56 PM, abyssunder said: I can't help you with an ID, but maybe you can help me. Those nice grey fossils are graptolites if I'm not wrong. Could they be Climacograptus species? Yes they're graptolites. I've seen the names Amplexograptus and Diplograptus tossed around in reference to these but haven't researched them much yet. Link to comment Share on other sites More sharing options...
Tetradium Posted July 17, 2021 Share Posted July 17, 2021 On 7/13/2021 at 10:02 PM, connorp said: This specimen was found in the Maquoketa Formation (Upper Ordovician) of Minnesota. My best guess is part of an echinoderm (crinoid or cystoid calyx?) but I'm not sure, I've never found anything similar. Any thoughts? The second one is something different. Maybe a broken up chitin invertebrate. Never had seen those in local Decorah/platteville in which chitin broke up then sediments fill in cracks. Link to comment Share on other sites More sharing options...
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