Many tools, such as scrappers, choppers, and hammers remained relatively unchanged in morphology and utility for large periods of time. Therefore, they are categorized as temporally undiagnostic artifacts. However, inexplicably, stone projective points changed in size and morphology numerous times throughout history. This has made them a useful tool in identifying distinctive cultures as well as reconstructing a chronologic timeline of these early people and the places they inhabited. The use of fine-grained cryptocrystalline cherts and quartzite, chalcedonies to make projectile points nonetheless, remain relatively consistent over time. Wear patterns show that it was common practice to repoint and resharpen these tools. Broken points were rarely discarded, but instead reworked into other tools, such as scrapers and drills.
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