Yes, and thats an amazing find from an old wall. Here in Arizona, old time settlers built homes and so forth with adobe from the local streams and as a result artifacts like pottery sherds or even arrowheads can be found washing out of the old adobe walls, as they melt away. In other cases, settlers used Indian grinding stones (manos and metates) in fireplaces and stone walls and so forth. Ive seen pottery and lithic debris and metates and manos in old walls before, but never heard of an awesome piece like this coming out of a wall. Thats really incredible. It probably came from wherever the rest of the stone in the house came from, which is likely close by.