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Contracting stem dart points are assigned to various named types and are considered Archaic temporal markers, but their dating and geographic distribution remain somewhat variable and uncertain. Bayesian chronological modeling indicates contracting stem dart points were in use in the Colorado Plateau and Great Basin from  2210 cal BC  through  710 cal BC.  Comparative dating indicates contracting stem dart points did not arrive with farmers from Mexico, but rather, the dates and geographic distribution of the contracting stem points indicate this hafting style diffused rapidly throughout the western US.

The Appearance of Contracting Stem Dart Points in the Western United States, Diffusion or Migration?