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to TONMO Terri,
It looks like the siphuncle and a couple of chambers of an orthoconic nautiloid.
Some very much like it shown in This Thread.
Nice find.Kevin
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Why is it that when people attach stuff like this I can never see the attachment? I'm assuming she attached something anyway from the contexts of the above posts...Comment
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I actually found it in my backyard! I live in the Nashville basin area about 25 miles NE of Nashville, about 5 miles from the Cumberland river. Please excuse my lack of knowledge (total amatuer). I am guessing Ordovician. The fossils I am finding in the same area all seem to be common to this area and the ordovician period. I am trying to learn identification as I uncover the rock that contains all these fossils, so again forgive my ignorance. I have more pic. if you are interested, it may take a few days before I can post them.Comment
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Yes, post more pics.
Some fossils from the Nashville area
I think their Trilobite is actually a cephalopod
KevinComment
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I have a specimen a bit like this from Oklahoma. Endoceras sp., 14 cm, Poolville Member, Bromide Formation, "Blackriverian", Ordovician, Dunn Quarry, Criner Hills, Carter County, Oklahoma.
I made this little Bromide Formation sketch years ago, http://rusmithsgallery.fotopic.net/p47950992.html, but probably wouldn't show all those little Nautilus-style tentacles now given evidence from radulae to suggest that the orthocones could have been more closely related to ammonoids and coleoids (Gabbot 1999).Comment
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Here are a few more pictures, if anyone can help with identification I would appreciate it. Thanks Kevin and Hajar for the links and photos on previous post. These were found at the same location and the best I can do on that is, Ordivician (lower to middle?), Stones River Group, Wilson County, Tn.
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That top image beautifully shows the great big segmented siphuncle of Actinocerida, quite unlike my endocerid above.Comment
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I agree with Hajar, the first and third pics are of Actinocerids. Some very nice fossils for being as old as they are
The others may be Endocerids, but to know for sure you would have to slice them up and see if there are endocones inside the siphuncle (or find some that are naturally sectioned). There are a lot of Ellesmerocerids that have a ventral or marginal siphuncle, and they look just like Endocerids until you see the inside.
I will have a look at the Treatise later and see if I can get a better ID.
Edit:
I looked through the Treatise, and I'm afraid there are just not enough visible characters to ID the fossils better than just Actinocerida
KevinComment
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Look in the local University Library for a copy of this book.
Wilson, C.W., Jr., 1949, Pre-Chattanooga stratigraphy in central Tennessee: Tennessee Division of Geology Bulletin, v. 56, p. 1-407.
Its old, but should help
KevinComment
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Thanks for saving my picture Kevin, I am technologically challenged!
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