If someone at there wants to PM me there mailing address I will send some hard photos of what have.
Reviewing Terry Baxters book which show photo's and descriptions, the SW metate's which I have are as described. Mine for the most part are rocks that are 12" to 14" , flat with a large warn flat area in the middle of the rock which appears to have been made with a mano. Out side of the large rock TN posted a photo of which is a large flat rock with a warn spot on the middle, the other rocks look much different.