First, thanks to all that chimed in on this post. But now the verdict is in on the beads. Since there was an Native American village nearby and as the archeologist thought that the construction was 1800's, I'm going with this:
A pot smoking, hippy, belly dancer from Pakistan lost these on a beach in India in the 1800's. A visiting fur trader from America was checking his traps along the beach and stumbled across them, put them in his possibles bag and returned to Pennsylvania. As it was a long, hot trip back across the ocean, the first thing he did when he returned was to go to his favorite spring for a drink of cool water. unbeknownst to him, a chipmunk saw his bag laying on the ground and mistook the beads for a string of nuts, and thus scampered off with them. As they were extremely hard to eat, he buried them, hoping that by winter they would be much more palatable. The poor fellow got run over by a drunken, horse and carriage driver and never returned to retrieve them. In 2016 I found them and the provenance is now complete!!