CStewart Posted October 29, 2015 Share Posted October 29, 2015 (edited) Could these be oyster or crinoid cast / molds? The rock is around 15" in length. The two large impressions looked around 5" in diamaeter. Sorry no size indicator in photo. I decided to leave this big boy in the creek..long haul back to car Any help is appreciated! Chris Scientific Name: UNKNOWNFound: North Central Texas CreekDate Found: OCT 2015Formation: Ozan / Kau Size: Various Edited October 29, 2015 by CStewart Link to comment Share on other sites More sharing options...
Auspex Posted October 29, 2015 Share Posted October 29, 2015 They look like the "shells" of siderite concretions. "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...
Plax Posted October 29, 2015 Share Posted October 29, 2015 broken in half limonite (bog iron) concretions. roughly what Auspex said. the hollow ones sometimes have colorful mineral pigments in them Link to comment Share on other sites More sharing options...
Herb Posted October 29, 2015 Share Posted October 29, 2015 What Plax says "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...
CStewart Posted October 30, 2015 Author Share Posted October 30, 2015 (edited) Thanks guys. Glad I decided to leave it in the creek! Did find this nice tooth Edited October 30, 2015 by CStewart Link to comment Share on other sites More sharing options...
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