| Primitive peoples who have used the mano and metate solve this problem in one of two ways. |
| A single metate of lava or malpais was excavated at Awatobi. |
| Clay is tempered with sandstone crushed on the metate, and built up by coiling. |
| Ubelaker has associated such joint modifications in the remains of prehistoric Ecuadorian women with corn-grinding using a two-handed mano and slab metate. |
| With stone roller on metate, she grinds the corn, then grinds again. |
| The grains were ground on a stone saddle quern, or metate. |
