I'm not sure that is an arrowhead. Looks a bit off balance to fly straight. It looks serrated on purpose. "Maybe" a little double edged knife? They didn't like to waste anything from a kill. Could be an arrowhead though. I'm curious too. Nice find anyway.
Your piece shows many "Dalton" like characteristics. Although you found it west of the normal distribution area and the fact that it would be an unusually small example, it looks very much like a Greenbrier Dalton, early Archaic point...