turtlefoot Posted January 9, 2020 Share Posted January 9, 2020 I am really trying to learn my common invertebrate fossils. Can someone, once again, confirm my tenative identification, or correct me? I really appreciate it. The fossil in question is this oval fossil. After doing some research my guess is it is a crinoid of some sort. I am guessing that the little "nipple" in the center of the oval is where the normal hole is, but why does it have a line disecting the oval into two distinct parts? If it is not a crinoid, can someone please tell me what I am looking at, and where I went wrong on my identification? Thanks, Doug Link to comment Share on other sites More sharing options...
turtlefoot Posted January 9, 2020 Author Share Posted January 9, 2020 I guess I should add the important information. This rock was found in Douglas County, Missouri, USA. According to the Missouri Department of Natural Resources, it is the Roubidoux Formation that I found it in. The host rock is a total of 32mm across at it widest point. The fossil imprint in question measures 12x5mm and the bisecting area in the center measures 2mm across. Sorry for missing this info in the original post. Doug Link to comment Share on other sites More sharing options...
turtlefoot Posted January 9, 2020 Author Share Posted January 9, 2020 Here is a little closer image of the "nipple" and bisecting line. It looks strange under the microscope. It almost looks like a "backbone and tail". I am sure that it isn't, but that is the only way I know how to describe it. Link to comment Share on other sites More sharing options...
Fossildude19 Posted January 9, 2020 Share Posted January 9, 2020 It's a crinoid columnal imprint. Platycrinites is the genus. CLICK ME to see more. 6 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...
turtlefoot Posted January 9, 2020 Author Share Posted January 9, 2020 Tim, you are amazing! Thank you so much for the positive identification. I truly appreciate it. Doug Link to comment Share on other sites More sharing options...
Fossildude19 Posted January 9, 2020 Share Posted January 9, 2020 8 hours ago, turtlefoot said: Tim, you are amazing! Thank you so much for the positive identification. I truly appreciate it. Doug We are all here to help, Doug. And happy to do so. I learned about this type of crinoid here, myself. I have a relatively decent memory about such things, and when memory fails, there is always Google to remind me. 3 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...
Mark Kmiecik Posted January 9, 2020 Share Posted January 9, 2020 I learned something new too. Thank you. 1 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...
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