rwise Posted October 9, 2013 Share Posted October 9, 2013 (edited) Found in Finis shale of Graham formation, cisco virgilian series of upper penn, various brachiopods, gastropods, and nautiloids in area. I'm new at this......any ideas on what this is?? Found in Jacksboro, TX. Edited October 9, 2013 by rwise Thanks for your help in advance. Link to comment Share on other sites More sharing options...
Auspex Posted October 9, 2013 Share Posted October 9, 2013 Straight-shelled cephalopod, me thinks. "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...
jgcox Posted October 9, 2013 Share Posted October 9, 2013 Auspex is correct that is indeed a straight-shelled cephalopod. Nice find! Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted October 9, 2013 Share Posted October 9, 2013 mooreoceras? Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
erose Posted October 9, 2013 Share Posted October 9, 2013 At first I thought maybe you had a large one with the siphuncle preserved down the middle. But it just appears to be encased in a concretion. Did you find this higher up the slope? Dan's ID of Mooreoceras is a good bet but there are several that look very similar. If you can see the position of the small siphuncle you can start to sort them out. You will see that some are centered and others are off center. And some are oval, not round. Sorry I can not remember which is which off hand. Link to comment Share on other sites More sharing options...
Herb Posted October 9, 2013 Share Posted October 9, 2013 Mooreoceras "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...
Missourian Posted October 10, 2013 Share Posted October 10, 2013 That looks like a bactritid, which may be related to the ammonoids. They have the siphuncle running along one side. I've been searching for one of those guys for I don't know how long. Here is one found in my area: This one was labeled as 'Bactrites? wintersetensis'. Context is critical. Link to comment Share on other sites More sharing options...
erose Posted October 10, 2013 Share Posted October 10, 2013 (edited) That looks like a bactritid, which may be related to the ammonoids. They have the siphuncle running along one side. I've been searching for one of those guys for I don't know how long. Here is one found in my area: Bactritid.jpg This one was labeled as 'Bactrites? wintersetensis'. Along with the position of the siphuncle the relative spacing of the sutures in relation to the diameter is diagnostic. The individual chambers are too long for Mooreoceras or Pseudorthoceras. Possibly Michelinoceras? which I found an image of in a publication from Ohio. I don't have any literature with "Bactrites? wintersetensis, but Missourian does have a similar image. Edited October 10, 2013 by erose Link to comment Share on other sites More sharing options...
Missourian Posted October 10, 2013 Share Posted October 10, 2013 I don't have any literature with "Bactrites? wintersetensis, but Missourian does have a similar image. It's from this publication: http://kuscholarworks.ku.edu/dspace/handle/1808/3777 Context is critical. Link to comment Share on other sites More sharing options...
rwise Posted October 10, 2013 Author Share Posted October 10, 2013 Thanks to all for the help. Thanks for your help in advance. Link to comment Share on other sites More sharing options...
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