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Additionally, two small blade-like flakes of quartz were found at 200-210 and 310-320 cm, but will likely prove to be percussive shatter or perhaps even geofacts (Fig. (5) Because the deep unit was sited directly beneath a heavily-polished knob of the outcrop, care must be taken to segregate possible geofacts and zoofacts from artifacts.
To this end, Glen Halverson, one of Tom Origer’s students and my volunteer, created a mechanical trampling experiment to replicate the effects of megamamal trampling on local chert cobbles.
The single deep excavation unit revealed quarry debris to 220 cm, and several possible hammerstone spalls were found at 200-220 cm.
The auger test made in the same unit recovered what may prove to be small pieces of quarry shatter to 340-350 cm.
Furthermore, by identifying these Pleistocene features, it may be possible to map the archaeological presence of the area’s first people.
Since the initial discovery of the Sonoma Coast rubbing rocks, a loose-knit team of researchers (including archaeologists, geologists, paleontologists, geomorphologists, pedologists, physicists, chemists, zoologists, botanists, and molecular biologists) have been working with me to confirm or deny the Rancholabrean Hypothesis.
An additional component (or perhaps components) exists from about 100-180 cm, a zone characterized by compacted yellow loam subsoil.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 spring and fall 2003, and spring 2004 archaeological field classes from Santa Rosa Junior College, under the direction of Thomas Origer, and a summer 2003 volunteer crew under my direction, have to date excavated approximately 30 cubic m of the site.In spring 2003, six 1x1 m units were excavated near the jasper outcrop.