Okay, I have been a little off on the scoledont identifications recently but this one I am pretty sure of. It is the only jet black fossil I found have viewing tablespoon after tablespoon of gravel. It is from the Kope Formation of Carroll County, Kentucky. This creature existed in the Ordovician Period.
Looking through all the Kope Formation material I did find over 15 Cornulites tubes. I will post images of the smaller ones soon.
The jaw appears to be broken off at both ends. Image taken with microscope set to 40x.