The Bettye Broyles "Amos" type site reports from WV included the Charleston, Palmer & Kirk corner notched types in the excavated sequence, and in that order from earliest to latest, if I remember correctly. The Amos points were placed at the earlier end of the early archaic, and saying they date to 8000 BC or 10,000 YBP would not be far from current accepted thought. We have what appear to be Amos points here on the Delmarva, and most local collectors/researchers seem to consider them to be
9000-10000 YBP.