BudB Posted January 10, 2014 Share Posted January 10, 2014 (edited) I was in my kayak on the Brazos River last Saturday when I saw these fossils in a Volkswagen size boulder. The first photo shows most of the rock. The second is a full res closeup of the fossils. Any idea what they are? Edited January 10, 2014 by BudB Link to comment Share on other sites More sharing options...
Jersey Posted January 10, 2014 Share Posted January 10, 2014 (edited) They look like straight-shelled cephalopods. You can see the chambers. Edited January 10, 2014 by Jersey Link to comment Share on other sites More sharing options...
Tom Dill Posted January 10, 2014 Share Posted January 10, 2014 Looks like rudists to me. Giant, multi-chambered, irregularly curved, re-crystallized thick walls. If so, it might be a block of Edwards Limestone. Link to comment Share on other sites More sharing options...
Auspex Posted January 10, 2014 Share Posted January 10, 2014 Oh, those tricky rudists... "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...
Herb Posted January 10, 2014 Share Posted January 10, 2014 (edited) I think a rudist is likely also. Isn't most of the Brazos River area Eocene? If so,that would make a cephalopod unlikely. 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...
RyanNREMTP Posted January 10, 2014 Share Posted January 10, 2014 The Brazos pretty much runs through several different ages as it snakes it's way southward. Link to comment Share on other sites More sharing options...
Herb Posted January 10, 2014 Share Posted January 10, 2014 The Brazos pretty much runs through several different ages as it snakes it's way southward. Does it run through Paleozoic? "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...
JohnJ Posted January 10, 2014 Share Posted January 10, 2014 It will provide more clues if the general area along the Brazos was known. Up above Lake Granbury you can find Pennsylvanian aged deposits; along and below the lake, Cretaceous rocks dominate for miles. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
RyanNREMTP Posted January 10, 2014 Share Posted January 10, 2014 According to my maps the Brazos runs through Pennsylvanian and Permian. Link to comment Share on other sites More sharing options...
Auspex Posted January 10, 2014 Share Posted January 10, 2014 In one area, the Brazos exposes a strata that seems to be evidence of the tsunami created by the Chixulub meteorite impact. "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...
BudB Posted January 11, 2014 Author Share Posted January 11, 2014 (edited) This rock is on the Brazos just above Lake Whitney. Edited January 11, 2014 by BudB Link to comment Share on other sites More sharing options...
RyanNREMTP Posted January 11, 2014 Share Posted January 11, 2014 Cretaceous period then. Link to comment Share on other sites More sharing options...
Ludwigia Posted January 11, 2014 Share Posted January 11, 2014 Which then could point to rudists... Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
RyanNREMTP Posted January 11, 2014 Share Posted January 11, 2014 I would love to see some clearer pictures. Just so it would be easier to identify exactly what it is. Link to comment Share on other sites More sharing options...
Tom Dill Posted January 14, 2014 Share Posted January 14, 2014 I forwarded the photos to Dr. Robert Scott, who is an expert on rudists. He replied that these are caprinid rudists, with one specimen in longitudinal section and the other in an oblique section that shows tabulae formed at successive growth stages. They are common in the Lower Cretaceous Edwards Limestone, which is exposed in this area. Thanks, Bob! 2 Link to comment Share on other sites More sharing options...
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