PMA Posted July 8, 2018 Share Posted July 8, 2018 Hey, these pieces were found in the Normandy, France at the Falaises des Vaches Noir near Houlgate. I was wondering if these are all oysters and oysters pieces or if theres also something different? Link to comment Share on other sites More sharing options...
Echinoid Posted July 8, 2018 Share Posted July 8, 2018 @PMA, could you please post pics of the items in the last photo at different angles? Link to comment Share on other sites More sharing options...
PMA Posted July 8, 2018 Author Share Posted July 8, 2018 41 minutes ago, Echinoid said: @PMA, could you please post pics of the items in the last photo at different angles? Here are new pics, always 2 of each Link to comment Share on other sites More sharing options...
Cowboy Paleontologist Posted July 8, 2018 Share Posted July 8, 2018 I know that these two are some sort of Gryphaea which are in fact oysters. I'm guessing that these are from a Jurassic formation? Possibly G. arcuata or G. dilobotes, as these seem to be the most common around the coasts of England and France. 2 Link to comment Share on other sites More sharing options...
Ludwigia Posted July 8, 2018 Share Posted July 8, 2018 The Gryphaea are G.dilatata. First photo bottom left is a Myophorella. The ones on the right are either Arctostrea or Rastellum, although the experts seem to still be debating about what's what. 2 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
PMA Posted July 8, 2018 Author Share Posted July 8, 2018 5 hours ago, Cowboy Paleontologist said: I know that these two are some sort of Gryphaea which are in fact oysters. I'm guessing that these are from a Jurassic formation? Possibly G. arcuata or G. dilobotes, as these seem to be the most common around the coasts of England and France. I don't really know because I got them from friends, but I supposed its Middle Jurassic there. Thanks! 3 hours ago, Ludwigia said: The Gryphaea are G.dilatata. First photo bottom left is a Myophorella. The ones on the right are either Arctostrea or Rastellum, although the experts seem to still be debating about what's what. Really helpful, thanks! Arctostrea and Rastellum really look the same. Link to comment Share on other sites More sharing options...
elcoincoin Posted July 8, 2018 Share Posted July 8, 2018 Hi there First 4 photos : Actinostreon gregaria (lopha gregaria) so yes oyster photo 5 : myophorella sp so a clam photo 6 looks like the back side of a gryphaea dilatata so yes oyster photo 7 and 8 Actinostreon marshii (lopha marshii) so yes oyster rest i wont try to id that. 10 hours ago, PMA said: Here are new pics, always 2 of each 2 Link to comment Share on other sites More sharing options...
Ludwigia Posted July 9, 2018 Share Posted July 9, 2018 6 hours ago, elcoincoin said: First 4 photos : Actinostreon gregaria (lopha gregaria) so yes oyster This is what I meant above without going into details. Arctostrea gregaria was reassigned to Actinostreum gregarium according to Koppka & Co. although some paleontologists still use the former name. Actinostreum used to be called Lopha in many cases until someone revised that using the argument that Lopha is modern and not ancient. Cases like this can get confusing for amateur collectors, but it's important to know that different names often mean the same thing. 6 hours ago, elcoincoin said: photo 7 and 8 Actinostreon marshii (lopha marshii) so yes oyster You may be right on that. 2 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
elcoincoin Posted July 9, 2018 Share Posted July 9, 2018 6 hours ago, Ludwigia said: This is what I meant above without going into details. Arctostrea gregaria was reassigned to Actinostreum gregarium according to Koppka & Co. although some paleontologists still use the former name. Actinostreum used to be called Lopha in many cases until someone revised that using the argument that Lopha is modern and not ancient. Cases like this can get confusing for amateur collectors, but it's important to know that different names often mean the same thing. Hello, This is also true for the other one. we used to call them "trigonia" and now its "myophorella" ( for instance Myophorella clavellata ). Actually, it s even worth because another clam from "les vaches noires" used to be called trigonia and still is : Trigonia elongata 2 Link to comment Share on other sites More sharing options...
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