Hohokam

I beleave this to be a Hohokam hand diging tool.They lived in my area which is part of the Sonoran Desert.They were a prehistoric group of people who lived in the Sonoran Desert.
The Pioneer/Formative Period(AD 1-750)

The Colonial /Preclassic Period(AD 750=1150

The Classic Period (AD 1050-1450)

As you van see by the pictures-one can place their thumb in the square like hole and use this stone to dig with.There is a slant to the stone and it is smooth on the bottom. There were two area near where I live that tools and pottery have been found, I found this one in a wash near my home. Of course this is my thinking,Would like your input on this subject.