OP 15362-769

(Documentary Artifact): One b/w photographic print of a view of several mortar holes in a slab of bedrock in Doane Valley.

Notes on verso of print:
OP 15362-769/ 86:15900-1761/IN REF BOOK/ Deep Indian mortar/ holes in bedrock-/ Doane Valley-/ [Stamped:] ED. H. DAVIS/ Mesa Grande, Calif.

According to additional information provided on 9/2011 by a member of the E.H. Davis Project Scholar Advisory Committee: Bedrock outcroppings of granite were the site for the grinding of acorns by local Indians. Typically two areas are found in these outcroppings: deep mortar holes for pounding and mashing the acorn meats and smooth flat surfaces, called metates areas or grinding slicks in archaeology (based on the Mexican usage and word). These were used for more finely grinding the acorn meal. Handstones or manos were used for the metate areas and pestles were used to pound in the holes.