Those are crinoid stems, like a sea fern but from a few hundred million years ago. Unfortunately the first one is natural limestone, there would be no way for those crinoids to be cemented to the rock. Cool bifaces, man some ancient one did some mighty crafting. Kentucky is full of crinoid fossils, when i grew up down there we called them indian money, someone way back when might have worn them as wampum. Now that you said central ky, I'm leaning towards modified Adena the o e in black flint, second one looks Shawnee, found some of those myself. Limestone one looks worked yes.