The Hornfels Quarry was discovered in 1974 by amateur archaeologists seeking the source for stone tools that had been found in some abundance at a variety of prehistoric archaeological sites in eastern Massachusetts. The stone materials in question were originally thought to be of volcanic origin (based on
basaltic sources). A site on a nearby river with a large quantity of this particular type of stone convinced researchers the source had to be nearby. The quarry was located while searching for prehistoric sites near a golf course construction project to the north of the
Blue Hills Reservation. The stone found at the quarry is not basaltic in origin, but a heavily metamorphized sedimentary
slate known as
hornfels, that has a significant amount of silica. This stone had the property of being extremely hard, a desirable property for the Native Americans seeking to produce tools. Finds at the site include
diabase stone disks, used either as preforms from which edged tools were manufactured, or in the quarrying operations to extract more usable stone. Materials from these quarries have been found as far away as
Rhode Island. ==See also==