PaleoOrdo Posted August 27, 2021 Share Posted August 27, 2021 I wonder if this fossile in a shale is a graptolite or a nautiloid. The length is about 3cm, age middle ordovician, in the Elnes formation. The place has many graptolites. Pict. 1 Pict. 2 I also found this 1,5 cm long specimen, which seems to be a nautiloid? Link to comment Share on other sites More sharing options...
PaleoOrdo Posted August 27, 2021 Author Share Posted August 27, 2021 I guess the first speciemen is a graptolite, because of the line in the middle. 1 Link to comment Share on other sites More sharing options...
tombk Posted August 27, 2021 Share Posted August 27, 2021 Could the line down the middle of the second picture be a nautiloid’s siphuncle? 1 Link to comment Share on other sites More sharing options...
connorp Posted August 27, 2021 Share Posted August 27, 2021 Doesn't look very much like a graptolite to me. Whether it's a cephalopod, I don't know, the pictures are not very clear. Link to comment Share on other sites More sharing options...
LabRatKing Posted August 27, 2021 Share Posted August 27, 2021 From what I’m reading, the graptos in that formation are dendritic. Too long for a nautiloid methinks. This looks to be a crinoid column to my eye. 2 Link to comment Share on other sites More sharing options...
Rockwood Posted August 27, 2021 Share Posted August 27, 2021 1 hour ago, LabRatKing said: This looks to be a crinoid column to my eye. Likely looked much like a tiny string of pearls before it was exposed to weathering. I had something very similar ID last spring, I think it was. Link to comment Share on other sites More sharing options...
Fossildude19 Posted August 27, 2021 Share Posted August 27, 2021 The 3 cm length is not an issue for an orthocone nautiloid. 1 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...
PaleoOrdo Posted August 27, 2021 Author Share Posted August 27, 2021 (edited) 1 hour ago, LabRatKing said: From what I’m reading, the graptos in that formation are dendritic. Too long for a nautiloid methinks. This looks to be a crinoid column to my eye. In the Elnes formation (Middle Ordovician) we can find some dendrites, but not only dendrites. And a crionoid stem should not be tapering in the end? Nautiloid is possible but I was thinking of reteograptus graptolite. Edited August 27, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
LabRatKing Posted August 27, 2021 Share Posted August 27, 2021 1 hour ago, PaleoOrdo said: In the Elnes formation (Middle Ordovician) we can find some dendrites, but not only dendrites. And a crionoid stem should not be tapering in the end? Nautiloid is possible but I was thinking of reteograptus graptolite. Agreed. To my eye I interpreted the taper as a bend, down from the fracture surface. A bit of prep work would expose if it is a true tapered tip or a downward columnar bend. The centerline void/line is my indicator, however I am by no means an expert. Link to comment Share on other sites More sharing options...
PaleoOrdo Posted August 27, 2021 Author Share Posted August 27, 2021 The speciemen is not well preserved, but I managed to focus the shape of a part well enough to see the thekae of a graptolite: Link to comment Share on other sites More sharing options...
Rockwood Posted August 28, 2021 Share Posted August 28, 2021 3 hours ago, PaleoOrdo said: . And a crionoid stem should not be tapering in the end? I flat out disagree with the idea entirely. I just don't see a graptolite, or a nautiloid. The geometry is just wrong. Link to comment Share on other sites More sharing options...
PaleoOrdo Posted August 28, 2021 Author Share Posted August 28, 2021 Which geometrical attributes you think of? Link to comment Share on other sites More sharing options...
LabRatKing Posted August 28, 2021 Share Posted August 28, 2021 It’s the central/core line channel that makes me lean to a crinoid column. It’s obvious and continuous. I see similar if not identical fossils in numerous formations so often I don’t collect them anymore. Link to comment Share on other sites More sharing options...
Rockwood Posted August 28, 2021 Share Posted August 28, 2021 12 hours ago, PaleoOrdo said: Which geometrical attributes you think of? You can just about name them all. I can see the concept perhaps, but it looks like a badly weathered much thicker/denser body/mold fossil to me. The center being a narrow lumen. They were tiny in the ones I find. Link to comment Share on other sites More sharing options...
PaleoOrdo Posted August 29, 2021 Author Share Posted August 29, 2021 I understand, and I think we see differently. Link to comment Share on other sites More sharing options...
Packy Posted September 12, 2021 Share Posted September 12, 2021 Really need a more detailed photo Link to comment Share on other sites More sharing options...
Tetradium Posted September 12, 2021 Share Posted September 12, 2021 On 8/27/2021 at 4:54 PM, PaleoOrdo said: In the Elnes formation (Middle Ordovician) we can find some dendrites, but not only dendrites. And a crionoid stem should not be tapering in the end? Nautiloid is possible but I was thinking of reteograptus graptolite. There are one Decorah Ordovician cephalopod that looks very similar to crinoid at first glace and can fools the eyes. I don't have any immediate accessible pics. Its siphon often disappear along with its outer shell when fossilized at least for me. Your are much better preserved. 1 Link to comment Share on other sites More sharing options...
PaleoOrdo Posted September 12, 2021 Author Share Posted September 12, 2021 (edited) 3 hours ago, Packy said: Really need a more detailed photo I agree, and I tryed take several pictures and sharpen the focus, but the fossil is unfortunately inherently unclear. 2 hours ago, Tetradium said: There are one Decorah Ordovician cephalopod that looks very similar to crinoid at first glace and can fools the eyes. Yes, sometimes it is difficult see the difference. If anybody found a cephalopod which is similar with many chambers and of a similar size, I would be grateful see a picture of it for comparison. Thanks a lot for your opinions. Edited September 12, 2021 by PaleoOrdo Link to comment Share on other sites More sharing options...
Packy Posted September 12, 2021 Share Posted September 12, 2021 Did you try a tripod? If ising a camera set the iso at 80 and use the tripod and the 2 second timer. Another member taught me that and it works really well. Packy Link to comment Share on other sites More sharing options...
PaleoOrdo Posted September 13, 2021 Author Share Posted September 13, 2021 No, I just use my iPhone camera, but I had a cheap microscope last year but it crashed. Thank you for the tripad advice. Link to comment Share on other sites More sharing options...
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