Unfortunately, much of the debate between these two positions is characterized by preliminary research reports, hasty examinations of sites, a near absence of published data, and unsystematic and incomplete analyses. This is particularly true when the debate is over claims for early occupation in southern California, a region that has produced more purportedly early material than any other part of North America (cf. Moratto 1984). The purpose of this paper is to present recent data bearing on one of these claims, the Manix Lake Industry (Simpson 1958, 1960, 1964).