Prufer, Pedde, and Meindl 2001:14 has dates for archaic periods Late, Middle, and Early that are in BP and correlate with a +50 yr pattern. This is citing Griffin 1967. Griffin's ending date for Late Archaic is placed at 1000 BC which is a 500 yr difference with what is stated in the handbook (Sturtevant 1978:19-27. Stothers and Abel 1993:29-30 discuss the debate of the Late Archaic/ Early Woodland transition, yet they still place the end of the Late Archaic at 1000 BC = 2950 BP. One of the solutions is a new model that inserts a transitional phase from 1000 BC - 600 BC, having the Early Woodland begin at 600 BC.

See: Sturtevant 1978:19-27; Griffin 1967:178; Stothers and Abel 1993:29-30