Sandstone Shallow Basin Grinding Slab Use-Surface, Black Oak Acorn (Quercuskelloggii)
Tool Material: Quartz Arenite Sandstone, Pecked Surface Processed Material: Black Oak Acorn after Indian Ricegrass Processing Motions: Crushing, grinding, and pounding Use time: 2 hours of acorn processing after 6 hours of Indian Ricegrass seed processing