Dubs Posted August 3, 2020 Share Posted August 3, 2020 This is my very first post on The Fossil Forum. I was hoping for some experts to weigh in on what exactly are these fossils. I picked them from a lake shore in Central Texas. Can you please tell me the species? What are the approximate ages for these? Why did they go extinct? Thank you for all of your help. Dubs 1 Link to comment Share on other sites More sharing options...
Misha Posted August 3, 2020 Share Posted August 3, 2020 Nice finds! These are gastropods or snails. This is only a steinkern which means that there is no shell left and that we only see the rock that filled in what was inside. This might make a definitive ID quite difficult. As for the second question I myself am not very familiar with texas fossils but I have seen gastropods like this which were all from the Cretaceous so yours might be too. The last question I don't know what to say too. Did this group even go extinct? There are many factors that make something extinct. It may be a rapid change in the environment that the animal could not adapt to, it could be because some new predator appeared that quickly wiped out populations, it could be all sorts of other things. Edit: I did a bit of research and Lunatia is quite a common fossil in texas, they are Cretaceous in age and look pretty similar. They are also not extinct. I may be wrong and I am sure someone here on the forum will correct me 2 Link to comment Share on other sites More sharing options...
facehugger Posted August 3, 2020 Share Posted August 3, 2020 Cretaceous gastropod steinkerns. Guessing Glen Rose formation. Always nice to find the big ones. 1 Link to comment Share on other sites More sharing options...
Dubs Posted August 3, 2020 Author Share Posted August 3, 2020 (edited) Wow. Thank you Misha and facehugger for your quick response. I have really learned something from the both of you. I'm going to google "Cretaceous" to get a sense of how old they are. Thanks again. I look forward to posting some additional finds. Respectfully, Dubs Cretaceous Period - 145 to 66 million years ago Edited August 3, 2020 by Dubs Update Link to comment Share on other sites More sharing options...
Planko Posted August 3, 2020 Share Posted August 3, 2020 Nice find. Those are in good shape and larger than normal. 1 Link to comment Share on other sites More sharing options...
Dubs Posted August 3, 2020 Author Share Posted August 3, 2020 2 minutes ago, Planko said: Nice find. Those are in good shape and larger than normal. You know what they say about everything in Texas! 1 Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted August 3, 2020 Share Posted August 3, 2020 26 minutes ago, Dubs said: You know what they say about everything in Texas! No Illinois accent? Nice finds. Keep your eyes open for a left-handed one. (Google it.) 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...
Coco Posted August 3, 2020 Share Posted August 3, 2020 Hi, I confirm that the genus Lunatia isn't extinct : http://www.nmr-pics.nl/Naticidae/album/slides/Lunatia grossularia.html Coco 1 ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Dubs Posted August 4, 2020 Author Share Posted August 4, 2020 1 hour ago, Coco said: Hi, I confirm that the genus Lunatia isn't extinct : http://www.nmr-pics.nl/Naticidae/album/slides/Lunatia grossularia.html Coco Awesome. Thank you! Link to comment Share on other sites More sharing options...
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