Some awesome finds you are digging up! Most all the ones I have found and seen in my area come from one small area here in York County. Found only a few others around York and Chester county over the years. Always had been told they were Morrow Mountains till Dr, Goodyear looked at them. We were digging up a lot of pottery with them and I always thought they were associated. Here's a few of them
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This is my North Carolina tray from my states collection and the only Stemmed Point in t.here that looks similar to yours is right in the middle.