During the recent reanalysis of the flaked stone artifacts from the 1951-1961 excavations of the Rose Spring site (CA-INY-372; Fig. 1), an unusual bifacially worked artifact was noted in the collection. This specimen (1-186965), collected from the surface of the site by Francis Riddell in June of 1956, had been catalogued as a broken biface. However, upon closer scrutiny, the specimen proved to be a pressure-flaked, late-stage proximal fragment of an obsidian point with large channel flakes removed from each side of the artifact.

The Archaeology of Pinyon House, Two Eagles, and Crater Middens: Three Residential Sites in Owens Valley, Eastern California. Robert L. Bettinger. New York: American Museum of Natural History Anthropological Paper No. 67, 1989, 355pp., 98 figs.,102 tables, $38.00, (paper).

A review of previous data sets and recent research indicates that Humboldt Basal-notched biface forms are characterized by distinctive temporal spans within the prehistoric record of the southwestern Great Basin. Contrary to previous conclusions, we believe that the biface forms had two distinct periods of use, an early (4000 to 500 B.C.) and a late (500 B.C. to A.D. 800) manifestation. Humboldt Basal-notched bifaces from these two periods can be differentiated typologically and perhaps functionally.