BuddingPaleo Posted July 16, 2018 Share Posted July 16, 2018 This is probably an easy one for you guys. I have around 20 of these, so they must be common, I just can't seem to find one online that matches them. Sw Fl. Thanks! Link to comment Share on other sites More sharing options...
ynot Posted July 16, 2018 Share Posted July 16, 2018 What You have is a steinkern, a cast of the inside of a clam. It is almost impossible to identify to species without seeing the outside of the shell. 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...
BuddingPaleo Posted July 16, 2018 Author Share Posted July 16, 2018 4 minutes ago, ynot said: What You have is a steinkern, a cast of the inside of a clam. It is almost impossible to identify to species without seeing the outside of the shell. Does this shot of pattern help? Very degraded, I know. 1 Link to comment Share on other sites More sharing options...
ynot Posted July 16, 2018 Share Posted July 16, 2018 Someone else may have an idea, but not Me. 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...
BuddingPaleo Posted July 16, 2018 Author Share Posted July 16, 2018 1 minute ago, ynot said: Someone else may have an idea, but not Me. Me either, lol. Thanks for looking at it! Link to comment Share on other sites More sharing options...
FossilDAWG Posted July 16, 2018 Share Posted July 16, 2018 We can narrow it a bit more; it is an internal mold (steinkern) of a type of bivalve (clam) called an arc shell. However there are several genera (Arca, Anadara, Barbatia etc) and it would be difficult to assign your fossil to one of these. It might help if we knew where you collected it, as that might pinpoint a formation and so lead to a possible ID. Don 5 Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 16, 2018 Author Share Posted July 16, 2018 Just now, FossilDAWG said: We can narrow it a bit more; it is an internal mold (steinkern) of a type of bivalve (clam) called an arc shell. However there are several genera (Arca, Anadara, Barbatia etc) and it would be difficult to assign your fossil to one of these. It might help if we knew where you collected it, as that might pinpoint a formation and so lead to a possible ID. Don Sorry, thought I put location. Sw florida, corkscrew swamp area. I honestly don't know if I'm in any particular noted formation. I've looked at the maps but it doesn't name anything but time period, which is Plio Pleistocene. Link to comment Share on other sites More sharing options...
Bronzviking Posted July 19, 2018 Share Posted July 19, 2018 I agree with @FossilDAWG that it is an ark shell. It could be a turkey wing, they are common in Naples. I've found many internal and external shell molds in Tampa Bay Florida and I agree they are very hard to identify. I haven't come across a clam like yours yet. Here are some good resources/books I checked out at the library and were very helpful. Florida's Fossils, Roadside Geology of Florida and Florida's Seashells. Also a good website: http://www.aphotomarine.com/bivalve_arca_imbricata.html 1 Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 20, 2018 Author Share Posted July 20, 2018 17 hours ago, Bronzviking said: I agree with @FossilDAWG that it is an ark shell. It could be a turkey wing, they are common in Naples. I've found many internal and external shell molds in Tampa Bay Florida and I agree they are very hard to identify. I haven't come across a clam like yours yet. Here are some good resources/books I checked out at the library and were very helpful. Florida's Fossils, Roadside Geology of Florida and Florida's Seashells. Also a good website: http://www.aphotomarine.com/bivalve_arca_imbricata.html Thank you! That's a wealth of info as well. I can't wait to look it all up. Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 20, 2018 Author Share Posted July 20, 2018 I just went to your link and immediately was reminded of these guys. I had been trying to ID these for a while, they're so weirdly eroded. I thought they were cockles maybe, could they, too, be ark shells? Link to comment Share on other sites More sharing options...
Bronzviking Posted July 20, 2018 Share Posted July 20, 2018 Your welcome! The first one doesn't have much detail so it's hard to ID accept a bivalve. I did notice boring marks (looks like X's) caused by marine worms. If you could take a few more angles of the second one and give me the measurements I might be able to identify it. I'm leaning towards cockle shell. Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 20, 2018 Author Share Posted July 20, 2018 That actually is the same one, just the underside of it. I can add the other one though, just have to get pics of it. I'll do that shortly. Thanks it was just the ghosty (think pac-man) vibe from the skirted area. But they both eroded the same. I'll go get pics of the other. Kinda looks like just the arched portion if you broke away the long parts. But cockle was my original thought. Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 20, 2018 Author Share Posted July 20, 2018 I lied, you're right, I accidentally took a pic of the wrong bottom...lol Sorry. Link to comment Share on other sites More sharing options...
Bronzviking Posted July 20, 2018 Share Posted July 20, 2018 The side view in your hand looks like a heart shape which could be a Cockle, sometimes known as a Heart Clam. Google heart clam mold fossil and compare images. Link to comment Share on other sites More sharing options...
BuddingPaleo Posted July 20, 2018 Author Share Posted July 20, 2018 Cool, thanks! Link to comment Share on other sites More sharing options...
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