Gyllingberg Posted January 25, 2022 Share Posted January 25, 2022 Hi folks! I’m kind of stuck on this one. I presume this is a gastropod and not a cephalopod because of its small size (diameter around 2 cm). But what order, family, genus and species? Its found at Mt Billingen in Sweden, in a layer from middle Ordovician (middle to upper Darriwilian). 2 Link to comment Share on other sites More sharing options...
Paleorunner Posted January 25, 2022 Share Posted January 25, 2022 It is a cephalopod. ( Ammonite ) not gastropod, Link to comment Share on other sites More sharing options...
Gyllingberg Posted January 25, 2022 Author Share Posted January 25, 2022 This is not an ammonite. They hadn’t evolved 465 mya. Link to comment Share on other sites More sharing options...
FossilDAWG Posted January 25, 2022 Share Posted January 25, 2022 Welcome to the Fossil Forum. We're glad to have you aboard. Your fossil (which is very nice) cannot be an ammonite if it is Ordovician, as the group did not evolve until much later. There are coiled nautiloids in the Ordovician. However your fossil does not appear to show suture lines or septa, which would be expected of a nautiloid cephalopod. There are also a number of planispiral (coiled in one plane) gastropods in the Ordovician. Without knowing more about the geological context, such as formation, the number of possibilities is quite large. Can you provide any more geological context for your find? Also a side view would be helpful to show the whorl profile. Don 1 1 Link to comment Share on other sites More sharing options...
Paleorunner Posted January 25, 2022 Share Posted January 25, 2022 5 minutes ago, Gyllingberg said: This is not an ammonite. They hadn’t evolved 465 mya. Sorry, I read, and replied too quickly.. @FossilDAWG Sorry, and thanks for responding quickly, and clarifying it. Link to comment Share on other sites More sharing options...
Gyllingberg Posted January 25, 2022 Author Share Posted January 25, 2022 Thank you! The formation is the gullhögen formation, and the fossil was found approximately 7.0-7.2 m above the top of the Holen limestone. I can post more images tomorrow. Link to comment Share on other sites More sharing options...
Gyllingberg Posted January 25, 2022 Author Share Posted January 25, 2022 From the side it looks planispiral, but the whorl profile is slightly “inwards”. Link to comment Share on other sites More sharing options...
minnbuckeye Posted January 25, 2022 Share Posted January 25, 2022 I collect the Ordovician here in Minnesota. I notice it spirals to the left similar to Maclurites locally. Any similar species in the Darriwilian? Just a distant consideration!!! Mike Maclurites - Perfect Limestone Internal Mold FROM THE ALBUM: Fossils As Sculpture Link to comment Share on other sites More sharing options...
Gyllingberg Posted January 26, 2022 Author Share Posted January 26, 2022 @FossilDAWG here is another image of the fossil Link to comment Share on other sites More sharing options...
hemipristis Posted January 26, 2022 Share Posted January 26, 2022 Nautiloid? 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
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