Recently obtained radiocarbon analyses of the charred parts of pinyon pine cones and seeds from the Sherwin Grade site. Mono County, California, (CA-Mno-584) are of significance to the controversy concerning the proposition that regular use of pinyon resources initiated in the Owens Valley region between A.D. 600 and A.D. 1000 (Bettinger 1976, 1977a, 19776; McGuire and Garfinkel 1976; Garfinkel and Cook 1979).