Hi Jim Chandler,
Yes, I am familiar with the woostergeologist blog and I have read the post on the permian productid brachiopods collected from Texas. Those he writes about are a little younger. With brachiopods knowing the age of the formation where they were collected is really important. But there are a huge variety of brachiopods forming a confusing hay stack of almost look a likes. Ages and locations narrow the possibilities.
Thank for you advice.
David.