Kcee Posted January 28, 2020 Share Posted January 28, 2020 Not sure what to make of this, I first thought that maybe it was part of a large gastropod shell but after digging it out of the sandstone boulder it was in, it looks as if that may be almost the complete specimen. Looks to be about 80% complete. Anyone have a clue as to what this might be? Link to comment Share on other sites More sharing options...
Natalie81 Posted January 28, 2020 Share Posted January 28, 2020 A piece from a gastropod Link to comment Share on other sites More sharing options...
Rockwood Posted January 28, 2020 Share Posted January 28, 2020 3 hours ago, Kcee said: Looks to be about 80% complete. You mean eight out of ten surfaces look unbroken ? It seems unlikely to me. Link to comment Share on other sites More sharing options...
Ludwigia Posted January 28, 2020 Share Posted January 28, 2020 I believe that this is the sedimentary impression of the inner whorls of a gastropod. What is that called? An external cast? Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Rockwood Posted January 28, 2020 Share Posted January 28, 2020 52 minutes ago, Ludwigia said: An external cast? Link to comment Share on other sites More sharing options...
RJB Posted January 28, 2020 Share Posted January 28, 2020 The tip pf the siphon is gone and most or all of the whorls are gone. You have a piece of a gastropod. RB 2 Link to comment Share on other sites More sharing options...
Ludwigia Posted January 28, 2020 Share Posted January 28, 2020 6 hours ago, Rockwood said: So what is it then? Don't keep me in suspense! Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Rockwood Posted January 28, 2020 Share Posted January 28, 2020 2 hours ago, Ludwigia said: So what is it then? Don't keep me in suspense! I think you're trying to describe an internal mold, but I can't confirm it from context because RJB just told us what it is. Wouldn't an external cast be a little bit like trying to drink from a cannon ball ? Link to comment Share on other sites More sharing options...
Ludwigia Posted January 28, 2020 Share Posted January 28, 2020 1 hour ago, Rockwood said: Wouldn't an external cast be a little bit like trying to drink from a cannon ball ? Sounds kind of uncomfortable. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Kcee Posted January 29, 2020 Author Share Posted January 29, 2020 Anyone have a photo of a gastropod that might show this part of it?? Link to comment Share on other sites More sharing options...
Mahnmut Posted January 29, 2020 Share Posted January 29, 2020 I think the word is columella, meaning the spiral middle column of a snails shell, which is relatively complete in your specimen, in contrast to its outer regions. If you search it, add "gastropod", otherwise you will find lots of pics of broken noses because its aparrently also a term in human anatomy. Aloha J Try to learn something about everything and everything about something Thomas Henry Huxley Link to comment Share on other sites More sharing options...
Rockwood Posted January 29, 2020 Share Posted January 29, 2020 22 minutes ago, Mahnmut said: I think the word is columella I think both columella and siphon both apply. I couldn't find an example in my collection for reference, but I think the third photo down does look like where the two join. Link to comment Share on other sites More sharing options...
Mahnmut Posted January 29, 2020 Share Posted January 29, 2020 Hi Rockwood, I didn´t mean to correct you, I just thought columella might be a helpful keyword to find pictures of the structure. Cheers, J 3 Try to learn something about everything and everything about something Thomas Henry Huxley Link to comment Share on other sites More sharing options...
Kcee Posted January 30, 2020 Author Share Posted January 30, 2020 Thanks for the photo Rockwood, I can clearly see that it is a fragment from a gastropod like the one you posted. There was no sign of the rest of the fossil in that boulder. Link to comment Share on other sites More sharing options...
westcoast Posted January 30, 2020 Share Posted January 30, 2020 19 hours ago, Rockwood said: I think both columella and siphon both apply. I couldn't find an example in my collection for reference, but I think the third photo down does look like where the two join. The siphonal canal or siphonal aperture is part of the hard shell. The siphon is the soft body part that generally won't be preserved. 1 Link to comment Share on other sites More sharing options...
Plax Posted January 30, 2020 Share Posted January 30, 2020 On 1/28/2020 at 2:36 PM, Rockwood said: I think you're trying to describe an internal mold, but I can't confirm it from context because RJB just told us what it is. Wouldn't an external cast be a little bit like trying to drink from a cannon ball ? This is getting dangerously close to the cast or mold controversy! Link to comment Share on other sites More sharing options...
Rockwood Posted January 30, 2020 Share Posted January 30, 2020 1 hour ago, Plax said: This is getting dangerously close to the cast or mold controversy! 1 Link to comment Share on other sites More sharing options...
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