The rock types and the patination/surface modification that's developed are the best ways to distinguish them. They even used some identical shapes; the Perdiz, Maud, Starr, and a few other Texas point types have identical counterparts from the Sahara, only much earlier. The materials can really fool a person if you aren't real familiar with it as well. Most of the arrow points in central TX are made from Edwards Plateau Chert, and some the Saharan agates can be a dead-ringer for it.I assume one of the few ways would be rock types., use geology. I’m probably wrong but I’d guess their are just a few shapes one can make, and techniques one can use to break rocks
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