Excerpt from : ” Broad Spearpoints and the Transitional Period Cultures in Pennsylvania by John Witthoft 1953.
Lithic material : Spearpoimts of this type are most often of Pennsylvania Jasper and rarely of other material. Rhyolite is the most frequent of the minority materials and rhyolite specimens are ordinarily found in the Schuylkill drainage whear the Jasper examples abound, rarely in the Susquehanna. The Jasper specimens are usually of very carefully selected material, of much better quality then the run of the mill stone at the quarries. Sometimes the Jasper used is a rare varient of the Pennsylvania stone, apparently a phase of the Jasper which was not used by other peoples or in other times. Actually, even chips of this stone are diagnostic of a site of this complex. This peculiar stone sometimes has a greyish white, variegation with opaque brown-red splotches, white opaque spots and dark gray areas. In other examples …