“…Several studies of archaeological sites demonstrate a relationship between phosphate concentrations found in the soil and areas of specific household activities (Barba et al, 1987;Cavanagh et al, 1988;Craddock et al, 1986;Dunning, 1993;Killion et al, 1989;Konrad et al, 1983;Manzanilla and Barba, 1990;Middleton and Price, 1996;Ortiz and Barba, 1993;Proudfoot, 1976;Robin, 1999;Sá nchez et al, 1996;Terry et al, 2000;Wells et al, 2000). Ethnographic studies also illustrate the relationship between phosphate concentration and domestic activities (Barba and Ortiz, 1992).…”