I think that is an old cannon ball. Do some research on Civil War era cannon balls. These were used in the Indian Wars as well as Civil War era and I am betting this is one that had been fired but didn't explode. Is there a crease around the middle of this?Found this walking a dried creek bed. First artifact Ive ever found. Anyone have an idea what it is? Axe head? Should I be looking around the area for more?