I thought it might be from the west side of the state. thanks for confirming. It's enjoyable personally, learning about lithics, trying to accurately identify them, and having some concept of how far it traveled in it's life. Recently found some areas that are producing a large amount of worked "Del Rio" material. It's supposed to be some what rare and desirable from what i understand, coming from small and very localized outcroppings.
i'll keep my eyes peeled for chunks of horse creek for you CaptE. I'm a bit of a walk east from Hardin county, not nearly as far as some of the recorded distances of material being found from it's source tho.