“…A number of excellent locality and regional analyses of possible movement corridors or areas of initial settlement or activity also exist. These have emphasized biotic communities, major physiographic features such as coastal zones, river valleys and mountain ranges, or the locations of animal trails, salt licks, and lithic raw material sources (e.g., Anderson 1990;Dincauze 1993aDincauze , 1993bErlandson and Moss 1996;Frison 1991; Gillam 1996 a, b;Hoffecker et al 1993;Judge 1973;Spiess et al 1998;Tankersley 1985Tankersley ,1990Tankersley ,1991Tankersley ,1997. The co-occurrence of early sites along glacial and pluvial lake margins in the Midwest, Southwest, and Great Basin has been widely noted (Deller and Ellis 1988;Ellis 1994;Ellis and Deller 1998;Ellis et al 1998:155-158;Judge 1973;Shott 1986; Willig 1996;Willig et al 1989), for example, as has the occurrence of numerous early assemblages along the major river valleys of eastern North America (Anderson 1990;Dincauze 1993aDincauze , 1993bMason 1962;Williams and Stoltman 1965).…”