“…When mega-and macroscopic identifications are tested for accuracy, the results are often surprisingly poor (Calogero, 1992;Ives, 1984Ives, , 1986Luedtke, 1992Luedtke, , 1993Nance, 1984). The problem is not the use of qualitative traitsdsystematic studies of qualitative traits such as fluorescence under ultraviolet light, color, texture, and presence of inclusions may provide reasonably confident provenance assignments (e.g., Hofman et al, 1991;Luedtke 1992;Lyons et al, 2003;Malyk-Selivanova et al, 1998)dbut few such systematic studies have been undertaken. Rather, the problem arises from a conflation of extensionally derived descriptional ideational units, i.e., "types" of stone within a folk geological taxonomy, with empirical units, i.e., stone available from a specific locationda problem not unique to lithic-sourcing studies in archaeology (O'Brien and Lyman, 2002).…”