sviehweg Posted January 8, 2014 Share Posted January 8, 2014 Found this in the Grand Lake area of Northeastern Oklahoma in the roots of an uprooted tree along the shoreline of the Grand River. The Grand Lake is a man made lake built in 1940. The river is the lower section of the Neosho river. This area was covered by shallow seas during the Cambrian period. Is this find a fragment of a "tusk shell"? Link to comment Share on other sites More sharing options...
Missourian Posted January 8, 2014 Share Posted January 8, 2014 Welcome to the forum. That is a piece of a solitary rugose coral. http://en.wikipedia.org/wiki/Rugosa Context is critical. Link to comment Share on other sites More sharing options...
sviehweg Posted January 8, 2014 Author Share Posted January 8, 2014 Quick reply. Thanks. That explains the other type of coral I seem to find in the area. Link to comment Share on other sites More sharing options...
Herb Posted January 9, 2014 Share Posted January 9, 2014 (edited) There were no tusk shells in the Cambrian period, The majority started in the Devonian period. To me, that coral looks more recent especially since there were no rugose corals in the Cambrian either. Since you found it along the river, it may have washed in from some other area/and age. Edited January 10, 2014 by Herb "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...
fossilcrazy Posted January 9, 2014 Share Posted January 9, 2014 (edited) I'm going to say it's a Calamites cast. More than likely it's Pennsylvanian in age and the Neosho has that. Rugose is conical and long species can be cylindrical; but both would show septa. An example: Edited January 9, 2014 by fossilcrazy Link to comment Share on other sites More sharing options...
Herb Posted January 10, 2014 Share Posted January 10, 2014 not a bad guess also. "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...
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