|'Iipay Aa Name||hapiichaa|
A whole hand-held grinding stone, also known as a mano in Southern California archaeology. This stone is bifacial and shaped. It is circular in shape. The stone material is an igneous rhyolite with possibly muscovite mica. It is coarse grained.
This grinding or milling stone ventral side appears to have a heavier grinding area with a small area of polished cortex. This grinding stone dorsal side has lighter grinding with most of the cortex of the stone intact. Striations appearing on the surface suggest that this mano was used in an undulating or back and forth movement (rotary may also have been used). Wear marks on the perimeter sides suggest all edges were used in grinding and one area in particular is more heavily worn. Construction of the stone appears to be pecked on the edges and ventral surface; pecking increases the grinding surface for greater traction.
Length - 4.645", Width - 4.015", Height - 2.125", Weight - 2.24 lbs.
|Provenance||This artifact was found within the local San Diego County region, collected 1910-1950.|
|Date||Late Prehistoric (1300-800 YA)|
|Culture||Kumeyaay / Diegueño|
|Place of Origin||San Diego County|
|Caption||Mano, rhyolite: ventral view, side A (polished , pecked working surface).|