cmercado Posted March 8, 2017 Share Posted March 8, 2017 Ho everyone, I've been all over the place trying to figure out what fossil this is, but being a rank amateur is no help. Any ideas as to what this is? Thanks! Link to comment Share on other sites More sharing options...
Bguild Posted March 8, 2017 Share Posted March 8, 2017 Hey there! We'll probably need some pictures that are more in focus as well as any information you have about where this was found. Link to comment Share on other sites More sharing options...
Ludwigia Posted March 8, 2017 Share Posted March 8, 2017 The photos are very blurry, but I'm pretty sure that I recognize an oyster, possibly Arctostrea gregaria from the Oxfordian, for instance in Normandy, France. Please give us more information on it if you happen to know the location where it was found and also the stratigraphy. Better focussed photos would make id much easier, as Bguild suggests. 2 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 8, 2017 Share Posted March 8, 2017 I agree - it looks like an oyster, maybe similar to Rastellum sp. Regards, 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
JohnJ Posted March 8, 2017 Share Posted March 8, 2017 Tim is right, this is a Rastellum sp. bivalve. 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Ludwigia Posted March 8, 2017 Share Posted March 8, 2017 Sorry to complicate things, but it really could be an arctostrea. But lets wait and see if we get better photos and more information. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
abyssunder Posted March 9, 2017 Share Posted March 9, 2017 I agree with the others. It looks very close to the North American Ostrea (Arctostrea) carinata Lamarck described from the Cretaceous of Texas. As I said in the post linked by JohnJ, it has a lot of synonyms. 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Herb Posted March 9, 2017 Share Posted March 9, 2017 looks like Agerostrea falcata? to me "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Ludwigia Posted March 9, 2017 Share Posted March 9, 2017 Well, one thing's for sure. It's an oyster. I believe that A. gregaria is a synonym for A. carinata. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
abyssunder Posted March 9, 2017 Share Posted March 9, 2017 I think, Arctostrea gregaria sounds like Lopha gregarea , which is from the Oxfordian of Clavados, France, unlike Arctostrea carinata from the Cenomanian of Normandy, France. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
JohnJ Posted March 9, 2017 Share Posted March 9, 2017 I think in Texas, this one is well known as Rastellum carinatum (Lamarck 1819). 2 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
erose Posted March 9, 2017 Share Posted March 9, 2017 Until we know it's providence I am also going with Rastellum if it is in fact from Texas and not from the latest of our Cretaceous formations. Link to comment Share on other sites More sharing options...
Ludwigia Posted March 9, 2017 Share Posted March 9, 2017 7 hours ago, abyssunder said: I think, Arctostrea gregaria sounds like Lopha gregarea , which is from the Oxfordian of Clavados, France, unlike Arctostrea carinata from the Cenomanian of Normandy, France. I found mine many years ago at Vaches Noir and since I was still inexperienced at identifying, I put an id question into Steinkern, which precipitated a huge debate about what it might be called, due to innumerable revisions over the years. I didn't quite understand what was going on at that point, but since a recognized bivalve expert insisted that it should be called A. gregaria, I went along with that and I haven't really thought about it since then. If you google that name, you end up with a string of oysters, mostly from Normandy, with that name. It could however very well be an error. It seems that there are still a lot of different opinions about the taxonomic position of this subgenus or genus, depending on what you read, let alone the species, so the jury still seems to be out on this one, at least in Europe. So I've just decided to revise mine, call them all Arctostrea sp., and leave it at that. Lopha, by the way, is no longer recognized as a fossil species and Actinostreon has taken over the genus name. 7 hours ago, JohnJ said: I think in Texas, this one is well known as Rastellum carinatum (Lamarck 1819). I've had a closer look and now I agree with you on that, since it's from Texas and the subgenus is Arctostrea. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
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