Carbon 1213 dating
The other two loci are smaller blueschist boulders (4 and 5 m tall).
To date, I have located six sites consisting of one or more rubbing rocks, all within an area about 4 km in diameter.Jasper Rock: A, midsection of an obsidian serrated projectile point; B, obsidian corner-notched serrated projectile point; C, chert burin-like end scraper with blade scars on dorsal surface; D, chert backed bladelet; E, quartz blade-like flake (? ); G, chert backed bladelet; H, obsidian backed bladelet; I, chert backed bladelet.CA-SON-1719: J, chert blade-like flake; K, chert blade-like flake; O, chert side scraper; P, obsidian burin spall (? SCSB-03-2: L, quartz thumbnail scraper; M, chalcedony side scraper (has polish on edge at bottom of image). CA-NAP-58: Q, obsidian microblade; R, obsidian microblade; S, obsidian microblade, 35 mm long.The results of that experiment are currently being analyzed.However, some of the mechanically-produced “zoofacts” appear to closely resemble cultural debitage.