I think it was likly worn around the neck with a corded Buffalo skin. If you had one the women would know you could start a fire. Where did you find it?
My driveway here in Texas is very long and is an oilfield road to the pumpjack pad. They bring in river gravel every now and then to spread on the driveway. The rock is from that gravel that was put on the driveway. Since it is from a river gravel pit, most likely was an indian campsite dug up somewhere. Pit operator is not going to report that.