Rethinking the Antiquity of Bedrock Mortars on the Central California Coast
- Author(s): Jones, Terry L.;
- Lebow, Clayton G.
- et al.
Previous assessments of the age of bedrock mortars (BRMs) on the central California coast have limited them to post cal A.D. 1250 contexts. Recent investigations from a single-component late Middle Period site with associated bedrock mortars (CA-SLO-5) on the San Luis Obispo coast, and the stratigraphic position of a bedrock mortar cup beneath dated midden residues at Swordfish Cave (CA-SBA-503) in northern Santa Barbara County, indicate that these features were used as early as 1,385 cal B.C. and that their overall age encompasses the late Early, Middle, Middle-Late Transition, and Late/Early Historic periods in this region.