This chronology is under construction, and incomplete.
Northwestern Plains Projectile Point Type Chronology
The following sources were used as a reference to create this chronology:
Frison, G. C. 1978 Prehistoric Hunters of the High Plains. Academic Press, New York.
Greiser, Sally T. 1984 Projectile Point Chronologies of Southwestern Montana. Archaeology in Montana Volume 25, Number 1 : pp 35-48.