Cynwhite Posted May 7, 2022 Share Posted May 7, 2022 Found on surface in area with numerous crinoid stem sections. Stone appears to also have stem cross-section impressions. Friend notes this specimen does not have the five-lobed feature of crinoids. Western St. Louis County, Missouri. Near Rockwoods Reservation. Rocky clay soil is tens of meters deep with egg- to fist-size rounded stones throughout. Is this a cross-section or a negative impression? Vascular bundles? If not crinoid, what? 1 Link to comment Share on other sites More sharing options...
Rockwood Posted May 7, 2022 Share Posted May 7, 2022 Basal plates of a calyx ? 2 Link to comment Share on other sites More sharing options...
Cynwhite Posted May 7, 2022 Author Share Posted May 7, 2022 Thank you. I wondered, but all crinoid examples I find online are pentagonal and five-lobed. I haven’t found examples that are trilobate. Link to comment Share on other sites More sharing options...
Rockwood Posted May 7, 2022 Share Posted May 7, 2022 I have to admit that I failed to find clear illustrations too. I still don't think five is an absolute though. Link to comment Share on other sites More sharing options...
Ludwigia Posted May 7, 2022 Share Posted May 7, 2022 2 hours ago, Rockwood said: I have to admit that I failed to find clear illustrations too. I still don't think five is an absolute though. Link 2 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted May 7, 2022 Share Posted May 7, 2022 Interesting. This one is intriguing. Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
abyssunder Posted May 7, 2022 Share Posted May 7, 2022 Lobolith? " 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...
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