Drew (1979) has outlined theoretical and geomorphic considerations for locating pre-Clovis sites in the continental United States. Drew considers archaeological sites in loess, cave, and alluvial sediments to be unacceptable for identification of pre-Clovis occupations. Sites in depressions or playas, common to the High Plains, are concluded to be ideally suited for containing and preserving pre-Clovis sites. However, loess, cave, and alluvial deposits possess attributes conducive to site preservation and interpretation whereas the genesis, stratigraphy, and mineralogy of many High Plains playas pose serious problems for geoarchaeological interpretation. Drew's proposal for prospecting for pre-Clovis sites by machine-testing numerous playas is considered to be physically and financially impractical.