John Posted December 4, 2010 Share Posted December 4, 2010 Perhaps a CT scan would reveal something imperceptible to the naked eye or microscope. I'd have to ask him about that but if a shark egg case could survive in some way perhaps at least the teeth of an embryo would be preserved especially if the egg was about to hatch when it was buried. Also, if something as soft-bodied as a worm could be preserved, why not a shark embryo? Complete sharks are known from Mazon Creek and a few appear to be at least young as juveniles. The bottom line with all fossil eggs and the like is that unless identifiable embryonic remains are found inside, the identification as an egg is always uncertain. It sounds obvious, but you would be amazed at how many "eggs" and "egg cases" turn out to be other things. In the Mazon Creek instance, the evidence is very good that most of these fossils are indeed egg cases, but unless or until embryonic remains are found inside one, it is impossible to completely rule out the possibility that they are something else. For now, yeah, they are probably shark egg cases. “When you're riding in a time machine way far into the future, don't stick your elbow out the window, or it'll turn into a fossil.” - Jack Handy Link to comment Share on other sites More sharing options...
Terry Dactyll Posted December 4, 2010 Share Posted December 4, 2010 (edited) ''Perhaps a CT scan would reveal something imperceptible to the naked eye or microscope.'' More often than not they are crushed completely flat.... but perhaps those that are not could be looked at using new technology but every indicator is pointing to they are shark eggcases and that is what they are widely considered to be.... I would imagine the ID's of many types of fossil eggs found is uncertain but that is palaeontology.... putting what pieces of the jigsaw we have together to get a better understanding until another piece to the puzzle is found to make us think different.... accepting one provisional identification and not another is a personal choice we make...was T Rex blind until we find an eyeball... I know you could say there are eye sockets in the skull etc.... but you get my drift... Edited December 4, 2010 by Terry Dactyll Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Terry Dactyll Posted April 7, 2011 Share Posted April 7, 2011 Heres a gift from a friend.... The eggs were completely buried in the nodule besides the tips at one end and it got a little sticky towards the other end but I'm very happy with the results.... it is another example in the collection from the upper carboniferous of the UK... a 'double' Palaeoxyris..(Shark Eggcase) I tell you whats favourable evidence from a collectors perspective in the argument for the shark eggcase theory (besides the scientific papers already written)... They are found with other Aquatic material like fishscales or cyclus and horsehoe crabs...No plant or seeds... strange eh Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Coco Posted April 7, 2011 Share Posted April 7, 2011 Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
Terry Dactyll Posted May 17, 2011 Share Posted May 17, 2011 Another recent Palaeoxyris.... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Nandomas Posted May 18, 2011 Author Share Posted May 18, 2011 Another recent Palaeoxyris.... Again? :o You make me jaelous Erosion... will be my epitaph! http://www.paleonature.org/ https://fossilnews.org/ Link to comment Share on other sites More sharing options...
Terry Dactyll Posted May 22, 2011 Share Posted May 22, 2011 Again? :o You make me jaelous This ones a nice one from today... It popped great and is pretty d detailed Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
oilshale Posted February 15, 2012 Share Posted February 15, 2012 A new article by Ronald Böttcher: "Description of the shark egg capsule Palaeoxyris friessi n. sp. from the Ladinian of Germany and discussion of all known egg capsules from the Triassic of the Germanic basin" http://www.palaeodiversity.org/pdf/03/Palaeodiversity_Bd3_Boettcher.pdf Thomas 1 Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
Bill Posted February 15, 2012 Share Posted February 15, 2012 Very interesting with stunning specimens. Cheers. KOF, Bill. Welcome to the forum, all new members www.ukfossils check it out. Link to comment Share on other sites More sharing options...
Nandomas Posted February 15, 2012 Author Share Posted February 15, 2012 (edited) A new article by Ronald Böttcher: "Description of the shark egg capsule Palaeoxyris friessi n. sp. from the Ladinian of Germany and discussion of all known egg capsules from the Triassic of the Germanic basin" http://www.palaeodiversity.org/pdf/03/Palaeodiversity_Bd3_Boettcher.pdf Thomas Thomas, thanks for posting this paper. I was so lucky to meet that guy in person. It's so perfect, big and sweet to let me thinking it's one of the best fossil ever found to date. For size comparison there is the A4 scientific paper on the left. I am sorry the picture is not sharp how I should like Edited February 15, 2012 by Nandomas Erosion... will be my epitaph! http://www.paleonature.org/ https://fossilnews.org/ Link to comment Share on other sites More sharing options...
Bill Posted February 15, 2012 Share Posted February 15, 2012 Very nice Nando. KOF, Bill. Welcome to the forum, all new members www.ukfossils check it out. Link to comment Share on other sites More sharing options...
Coco Posted February 16, 2012 Share Posted February 16, 2012 Thanks for this nice publication, and for your marvelous fossil Nando. It is so weel preserved ! Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
RCFossils Posted February 16, 2012 Share Posted February 16, 2012 Incredible specimen Thanks for posting the description! Link to comment Share on other sites More sharing options...
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