Ok, this fossil has me puzzled. It was found in Bois D Arc creek in Bonham; Fannin Co. Texas. Forgive me for not knowing much of the geological info on Fannin Co. Texas, but I think it's in the Austin Group, Late Cretaceous.
This piece looks like skin. Veining in sections, and a complex structure all the way through.
About 1 1/4" long.