hndmarshall Posted February 11, 2019 Share Posted February 11, 2019 While I was out cracking that last rock I found this in the drive is this a clam cast??? found in my drive from a gravel load west oh Houston Texas from Brazos river Link to comment Share on other sites More sharing options...
Carl Posted February 11, 2019 Share Posted February 11, 2019 I think it may just be a rock. But it sure comes darned close to a clam! Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 11, 2019 Share Posted February 11, 2019 Has a similar shape but this is indeed a rock. Here is a picture of a bivalve cast I found if that helps at all. best of luck, - John 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 12, 2019 Share Posted February 12, 2019 5 hours ago, Zenmaster6 said: Has a similar shape but this is indeed a rock. Here is a picture of a bivalve cast I found if that helps at all. best of luck, - John You have a brachiopod and not a bivalve. A bivalve would have mirror symmetry along a vertical line (as shown in the last photo). The last photo shows no symmetry since the vertical line is curved. 2 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Herb Posted February 12, 2019 Share Posted February 12, 2019 could be a clam cast but probably a stone 1 "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...
Zenmaster6 Posted February 12, 2019 Share Posted February 12, 2019 21 minutes ago, DPS Ammonite said: You have a brachiopod and not a bivalve. A bivalve would have mirror symmetry along a vertical line (as shown in the last photo). The last photo shows no symmetry since the vertical line is curved. THANK YOU. I said it was a brachiopod 9000 times and everyone on this forum kept telling me it was a bivalve. Go look at my identification page for this. Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 12, 2019 Share Posted February 12, 2019 26 minutes ago, DPS Ammonite said: You have a brachiopod and not a bivalve. A bivalve would have mirror symmetry along a vertical line (as shown in the last photo). The last photo shows no symmetry since the vertical line is curved. I was thinking that I knew my shells but everyone insists that it was indeed a bivalve. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 12, 2019 Share Posted February 12, 2019 42 minutes ago, Zenmaster6 said: I was thinking that I knew my shells but everyone insists that it was indeed a bivalve. This is a bivalve because the valves have shifted creating the offset beaks. Plus, I recognize from the pronounced concentric ridges that this is an Inoceramid, a clam. Note that if you shift the valves back in their original position you have a vertical plane of symmetry. 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 12, 2019 Share Posted February 12, 2019 36 minutes ago, DPS Ammonite said: I agree on that one. I was just showing that my original thought was brachiopods had a shelf and bivalves were symmetrical Link to comment Share on other sites More sharing options...
hndmarshall Posted February 12, 2019 Author Share Posted February 12, 2019 found these online also from texas some are the flatter look similar shape as mine in the start of this thread and the same yellowish orange silt they are the blue background photos ....I also found another but its very worn its in the last two photos this one I am on the fence about. Link to comment Share on other sites More sharing options...
Herb Posted February 13, 2019 Share Posted February 13, 2019 they are not brachiopods, they are worn pelecypod ( bivalve) steinkerns. Possibly Cyprimeria sp or even a Tapes sp steinkern. 3 "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...
Max-fossils Posted February 13, 2019 Share Posted February 13, 2019 13 hours ago, Herb said: pelecypod steinkerns. 'Pelecypod' is an old word for bivalve 13 hours ago, Herb said: Lima sp. How do you come to this conclusion? (picture from internet of a Lima lima vulgaris) ---/--- About the specimen of the OP, I could see it being a bivalve or brachiopod steinkern indeed (but a super worn one). Thing is, it's so worn that the definite features to differentiate the two are gone. However these two grooves make me lean more towards bivalve: Then again, it's so worn that it might just be a rock, and another of Mother Nature's pseudofossils made to trick us. If I were forced to put my money on one thing, then I would still say bivalve steinkern (but note that this is without great conviction) Whatever it is, it's not a very impressive specimen. Keep hunting, I'm sure you can find better in your area! Best regards, Max 2 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Rockwood Posted February 13, 2019 Share Posted February 13, 2019 On 2/12/2019 at 3:37 PM, hndmarshall said: found these online also from texas some are the flatter look similar shape as mine in the start of this thread and the same yellowish orange silt they are the blue background photos ....I also found another but its very worn its in the last two photos this one I am on the fence about. This argument becomes diluted by the fact that it is a group of one. If enough were found in association it would seem to increase the odds of it being a steinkern. Link to comment Share on other sites More sharing options...
Peat Burns Posted February 13, 2019 Share Posted February 13, 2019 15 minutes ago, Max-fossils said: 'Pelecypod' is an old word for bivalve How do you come to this conclusion? (picture from internet of a Lima lima vulgaris) ---/--- About the specimen of the OP, I could see it being a bivalve or brachiopod steinkern indeed (but a super worn one). Thing is, it's so worn that the definite features to differentiate the two are gone. However these two grooves make me lean more towards bivalve: Then again, it's so worn that it might just be a rock, and another of Mother Nature's pseudofossils made to trick us. If I were forced to put my money on one thing, then I would still say bivalve steinkern (but note that this is without great conviction) Whatever it is, it's not a very impressive specimen. Keep hunting, I'm sure you can find better in your area! Best regards, Max He may have meant Lima (Plagiostoma) Link to comment Share on other sites More sharing options...
Archie Posted February 13, 2019 Share Posted February 13, 2019 Looks like siliceous rocks with the coincidental appearance of a bivalves to me, where they have chipped they look like chert. 1 Link to comment Share on other sites More sharing options...
JohnJ Posted February 13, 2019 Share Posted February 13, 2019 18 minutes ago, Archie said: Looks like siliceous rocks with the coincidental appearance of a bivalves to me, where they have chipped they look like chert. Indeed. The original specimen posted appears to be a lenticular chert nodule. 2 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 13, 2019 Share Posted February 13, 2019 16 hours ago, Herb said: they are not brachiopods, they are worn pelecypod steinkerns. Possibly Lima sp. was that to me or to her? Link to comment Share on other sites More sharing options...
Herb Posted February 14, 2019 Share Posted February 14, 2019 5 hours ago, Zenmaster6 said: was that to me or to her? to her "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...
Herb Posted February 14, 2019 Share Posted February 14, 2019 8 hours ago, Max-fossils said: 'Pelecypod' is an old word for bivalve How do you come to this conclusion? (picture from internet of a Lima lima vulgaris) ---/--- About the specimen of the OP, I could see it being a bivalve or brachiopod steinkern indeed (but a super worn one). Thing is, it's so worn that the definite features to differentiate the two are gone. However these two grooves make me lean more towards bivalve: Then again, it's so worn that it might just be a rock, and another of Mother Nature's pseudofossils made to trick us. If I were forced to put my money on one thing, then I would still say bivalve steinkern (but note that this is without great conviction) Whatever it is, it's not a very impressive specimen. Keep hunting, I'm sure you can find better in your area! Best regards, Max pelecypod is used to differentiate from other types of bivalves ie... brachiopods, ostracods etc "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...
Herb Posted February 14, 2019 Share Posted February 14, 2019 7 hours ago, Peat Burns said: He may have meant Lima (Plagiostoma) what I actually meant was something like a Cyprimeria sp or even a Tapes sp steinkern. Most people know what a pelecypod is Class Pelecypoda. "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...
ynot Posted February 14, 2019 Share Posted February 14, 2019 20 minutes ago, Herb said: other types of bivalves ie... brachiopods, ostracods Neither of those are bivalves. One is in a class of its own (brachiopoda) and the other is a Crustacea Bivalves are Mollusc. 2 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Herb Posted February 14, 2019 Share Posted February 14, 2019 15 minutes ago, ynot said: Neither of those are bivalves. One is in a class of its own (brachiopoda) and the other is a Crustacea Bivalves are Mollusc. I am aware of that, but many people are not, and a brachiopod also has two valves as does an ostracod "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...
ynot Posted February 14, 2019 Share Posted February 14, 2019 6 minutes ago, Herb said: but many people are not, And We should endeavor to set them straight. By referring to "other bivalves" You confuse the issue and others less knowledgeable will get the wrong information. 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Herb Posted February 14, 2019 Share Posted February 14, 2019 13 minutes ago, ynot said: And We should endeavor to set them straight. By referring to "other bivalves" You confuse the issue and others less knowledgeable will get the wrong information. do you think anyone was confused when I initially called it a clam steinkern and later a pelecypod steinkern? In most texts and references they will be called pelecypods. BRACHIOPODS are also bivalves, in that there are two hinged parts to the shell, but the term is usually restricted to true molluscs. In hmdmarshalls blue backed pix the first one is clam steinkerns and the second one is brachiopods. The other appear to be stones. "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...
ynot Posted February 14, 2019 Share Posted February 14, 2019 10 hours ago, ynot said: 10 hours ago, Herb said: other types of bivalves ie... brachiopods, ostracods Neither of those are bivalves. One is in a class of its own (brachiopoda) and the other is a Crustacea Bivalves are Mollusc. @Tidgy's Dad, @RJB, @Shellseeker, @maxfossil, (Will not let Me tag anymore members here?) (Please tag any shell, crustacean or brachiopod collectors You can think of for this survey, thanks.) Should We refer to brachiopods and ostracods as bivalves? 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
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