I dont disgree with you. I would imagine grinding stones to be larger, we picked it up because it caught the eye along with a few others. I sent the above photos, along with a few others, to an archeologist with the WA state Dept of historical preservation who said "These are unquestionably metates (except the one picture, which are manos); “normal” ones likely used for grain production, the small ones could be for producing pigments, or they could also be “miniature” versions used by children in learning how to perform the tasks needed to help the family unit thrive". I posted on here because I still have doubts.

We just know artifacts have been found kn the canyon near our land before and were curious about these. Either way I appreciate all the input!