connorp Posted October 19, 2021 Share Posted October 19, 2021 I found this partial curved cephalopod at the famous cephalopod beds (Maquoketa Fm, Upper Ordovician) at Graf, Iowa last year. It is the only non-Isorthoceras cephalopod I have found from here in my several trips. The only other cephalopod I have seen described from this site is Beloitoceras, but I don't believe that is what my specimen is. Has anyone come across anything similar? Thanks for your thoughts. 3 2 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted October 19, 2021 Share Posted October 19, 2021 It doesn't look quite like the specimens of Beloitoceras I have seen either. But I haven't seen the species Beloitoceras grafense. Interesting and a great find, whatever! Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Crusty_Crab Posted October 19, 2021 Share Posted October 19, 2021 Having been to Graf a whopping 1 time, I only found straight cephalopods. However, there are other possibilities other than it being a new taxon, such as: 1. taphonomic deformation or 2. pathology. Link to comment Share on other sites More sharing options...
Al Dente Posted October 19, 2021 Share Posted October 19, 2021 Does it have any septa? Not seeing any in the photo. Link to comment Share on other sites More sharing options...
connorp Posted October 20, 2021 Author Share Posted October 20, 2021 Oops, this was supposed to be in the ID section. Could a mod move it? @Fossildude19 19 hours ago, Al Dente said: Does it have any septa? Not seeing any in the photo. No I don't see any either. Maybe just poor preservation? Not sure. I don't know what else this could be besides a ceph though. The ribbing reminds my of Centrocyrtoceras but I don't believe this genus is known from the Maquoketa. Link to comment Share on other sites More sharing options...
RuMert Posted October 20, 2021 Share Posted October 20, 2021 50 minutes ago, connorp said: what else this could be besides a ceph gastropods My sites & reports Link to comment Share on other sites More sharing options...
Fossildude19 Posted October 20, 2021 Share Posted October 20, 2021 57 minutes ago, connorp said: Oops, this was supposed to be in the ID section. Could a mod move it? Done! 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...
Tidgy's Dad Posted October 20, 2021 Share Posted October 20, 2021 2 hours ago, connorp said: No I don't see any either. Maybe just poor preservation? Not sure. I don't know what else this could be besides a ceph though. The ribbing reminds my of Centrocyrtoceras but I don't believe this genus is known from the Maquoketa. Yes, the ribbing is external. External features have been preserved but not the inside as far as can be seen. So the septa wouldn't show. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
connorp Posted October 20, 2021 Author Share Posted October 20, 2021 35 minutes ago, RuMert said: gastropods I am not familiar with any gastropod present in the area that has ribbing like this. All gastropods I've found in this formation also tend to be quite small (<1cm). 1 Link to comment Share on other sites More sharing options...
ChristineR Posted October 20, 2021 Share Posted October 20, 2021 I can’t help with the ID, but was wondering if the pattern was consistent with an internal mold of the fragment shown in your last photo? Link to comment Share on other sites More sharing options...
ChristineR Posted October 20, 2021 Share Posted October 20, 2021 Beloitoceras seems to display both patterns. Link to comment Share on other sites More sharing options...
piranha Posted October 21, 2021 Share Posted October 21, 2021 7 hours ago, ChristineR said: Beloitoceras seems to display both patterns. That is not Beloitoceras....that is just a stock image for all the Cephalopoda pages at: https://fossiilid.info/ B. grafense from: Miller, A.K., Youngquist, W. 1949 The Maquoketa Coquina of Cephalopods. Journal of Paleontology, 23(2):199-204 B. thorslundi from: Kröger, B., Aubrechtová, M. 2019 The Cephalopods of the Kullsberg Limestone Formation, Upper Ordovician, Central Sweden and the Effects of Reef Diversification on Cephalopod Diversity. Journal of Systematic Palaeontology, 17(12):961-995 Link to comment Share on other sites More sharing options...
ChristineR Posted October 21, 2021 Share Posted October 21, 2021 2 hours ago, piranha said: That is not Beloitoceras....that is just a stock image for all the Cephalopoda Well that was a silly mistake, If only it could be my last or my worst. Thank you! Link to comment Share on other sites More sharing options...
connorp Posted October 21, 2021 Author Share Posted October 21, 2021 I've reached out to an expert on the Ordovician cephalopods of this area. I will update with any replies. Link to comment Share on other sites More sharing options...
minnbuckeye Posted October 21, 2021 Share Posted October 21, 2021 I also sent your picture to an individual in Iowa who has a KEEN interest in cephalopods. Hopefully he will know definitively. Mike 1 Link to comment Share on other sites More sharing options...
tombk Posted October 21, 2021 Share Posted October 21, 2021 I’m curious to learn what the experts think. Link to comment Share on other sites More sharing options...
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