erose Posted October 22, 2021 Share Posted October 22, 2021 This may be a very Texas-centric post. Hopefully my fellow Texans will be able to help. I am sorting out specimens from the Walnut Formation here in Austin. These particular fossils were collected from the Bee Cave Member. The Walnut is part of the Fredericksburg Group and the age is Albian (Lower Cretaceous). There are three species of the oyster Ceratostreon known from our local rocks: C. texanum (Roemer), C. weatherfordensis (Cragin) & C.hilli (Cragin). If anyone is more familiar with these and can confirm my tentative identification I would be grateful. So the QUESTION regards the ones I have labeled C. weatherfordensis. The others that are C. texanum I have no doubts about. Those are classic marker fossils for the Fredericksburg Group and are distinct. take a look at the pics... Link to comment Share on other sites More sharing options...
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