Evidence for considerable prehistoric use of the Buffalo Hills glass is common and obsidian artifacts from numerous sites in northeastern California and northwestern Nevada (primarily in Plumas, Nevada, and Washoe counties) have been correlated with the source. Artifacts of Buffalo Hills obsidian also commonly co-occur with the visually similar South Warners source (northeastern California) and the initial name of South Warners 2 was used as an alternate source name until recently. A few artifacts of Buffalo Hills obsidian have also been found at southeastern Oregon sites.