This is a tooth? I found over fifty years ago and I don’t remember where. Picked up all kinds of things then..
I lived close to Palo Duro canyon in Texas at the time but often looked for fossils and rocks in Az, Nm, Co,Ut. On summer trips.
the length of the item is 8.5-9”, diameter 2.5”. Insides possibly looks like dentin.
New to forum so please excuse any mistakes I make, and thank you.