Plax Posted September 23, 2015 Share Posted September 23, 2015 as the clam grows the tube it inhabits is enlarged and lengthened. These are growth rings of a sort. What I say here is opinion of course but on this one I'm fairly certain. Link to comment Share on other sites More sharing options...
Al Dente Posted September 23, 2015 Share Posted September 23, 2015 Here's Kummelia from Dr. Fossil's website http://drfossil.com/deep_cut_fossils Link to comment Share on other sites More sharing options...
Plax Posted September 23, 2015 Share Posted September 23, 2015 i recall them from C&D now that I see Ed's pic. Shows the growth rings nicely Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 23, 2015 Share Posted September 23, 2015 (edited) In my opinion it's definitely belemnite...It could not be a phragmocone, it could be the internal shell. Here you have a image of one of my belemnites of Lower Jurassic (I know this fossil is from Cretaceous, but I think there are similarities between both).In it, you can see the growth rings, similar to your's. Edited September 23, 2015 by Guguita2104 Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 23, 2015 Share Posted September 23, 2015 One more: Link to comment Share on other sites More sharing options...
Al Dente Posted September 23, 2015 Share Posted September 23, 2015 In my opinion it's definitely belemnite...It could not be a phragmocone, it could be the internal shell. Here you have a image of one of my belemnites of Lower Jurassic (I know this fossil is from Cretaceous, but I think there are similarities between both).In it, you can see the growth rings, similar to your's. Belemnite.JPG Belemnite guards are composed of radial calcite. If you look at post #29 you can see that this fossil lacks the radial calcite. Link to comment Share on other sites More sharing options...
Foshunter Posted September 23, 2015 Author Share Posted September 23, 2015 Enlarged the Kummelia, what I see, is the large end has ridges but as it tapers down they totally disapear? Tried to enlarge some of the area John commented on. This is the best that my limited resources can accomplish Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 23, 2015 Share Posted September 23, 2015 Thanks Al Dente and nice discussion. I still believe it's belemnite.If it's not a rostrum, it's a phragmocone. Regards, Link to comment Share on other sites More sharing options...
JohnJ Posted September 23, 2015 Share Posted September 23, 2015 Identification is a process that makes for a good discussion. I've enjoyed the education. Thanks for the extra photo, Tom. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
abyssunder Posted September 23, 2015 Share Posted September 23, 2015 I know it's destructive, but a median longitudinal cut through the specimen may lead easier to a right conclusion. " 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...
Plax Posted September 23, 2015 Share Posted September 23, 2015 http://peabody.yale.edu/sites/default/files/documents/scientific-publications/ypmB41_1978.pdf 1 Link to comment Share on other sites More sharing options...
Guest GemstoneAndFossil Posted September 23, 2015 Share Posted September 23, 2015 If you think you know what this piece is please look at my possible belemnite post! thanks and I hope that we have an Id here! Link to comment Share on other sites More sharing options...
Foshunter Posted September 23, 2015 Author Share Posted September 23, 2015 Photographed a pic of a Kummelia from my Computer monitor, must say looks pretty good to me. First before this post goes any further, if it does, want to thank everyone that has expressed an opinion , that's what makes the Forum great and a help to the less educated, like me, in the fossil world. Would like opinions on this new information from Plax, must say looks like a match. Pictured are clams found where the piece was found, Pecan Gap Chalk Sulphur R. Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Wrangellian Posted September 23, 2015 Share Posted September 23, 2015 It's a pretty close match, but I am still puzzled by the longitudinal groove which looks like a crack (as I have seen in scaphopods etc that are compacted) - is there anything about the function of the boring clam that explains this feature? Link to comment Share on other sites More sharing options...
PFOOLEY Posted September 24, 2015 Share Posted September 24, 2015 ...the less educated, like me... You need to give yourself more credit...I've seen your posts. You are right about this Forum...good to have other viewpoints. 1 "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
FossilDAWG Posted September 24, 2015 Share Posted September 24, 2015 It's a pretty close match, but I am still puzzled by the longitudinal groove which looks like a crack (as I have seen in scaphopods etc that are compacted) - is there anything about the function of the boring clam that explains this feature? It is a crack. Kummelia tubes are almost perfectly circular in cross section, but as they lack internal structures they are often flattened (as is Foshunter's specimen) and then they show compression cracks. Don Link to comment Share on other sites More sharing options...
Auspex Posted September 25, 2015 Share Posted September 25, 2015 This has been an amazing process! The best of TFF, IMO! "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Plax Posted September 28, 2015 Share Posted September 28, 2015 Here is Eufistulana ripleyana from the Lower Peedee at Maple Hill, Pender Co, NC. Scale is centimeterDidn't take a pic of the broken end but there is a pelecyod steinkern in it. Guess we have general consensus? 1 Link to comment Share on other sites More sharing options...
JohnJ Posted September 28, 2015 Share Posted September 28, 2015 You guys make a strong case, and may well be right; but I would need to see a closer examination of Tom's find before I go over to "the clam side". Regardless, it's been an education and I appreciate learning something new. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
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