Well, I returned from my West Texas hiatus a few days ago, and have had time to process some of my finds. These were primarily found in the Terlingua area. Some ammonites - not sure if any prep work can expose more on these. Also some belemnitella, I think, and possibly a crab? Please let me know your thoughts.
I believe these came from the Boquillas formation, but I am not entirely certain. There is a LOT of rock in West Texas.