A PETROGRAPHIC STUDY OF PALEO-AMERICAN TOOL MATERIALS, DEERFIELD, MASSACHUSETTS
Of the 42,000 knapping waste flakes, 26 were prepared in thin section for petrographic identification. Eight were rhyolite, five of which are spherulitic and resemble the rhyolite from Mt. Jasper, Berlin, New Hamp[shire. The remainder of the flakes consist of Hudson Valley chert, Clough and other metamorphic quartzites, basalt from both the entablature and collonade of the Holyoke flow, pegmatite, and a few rocks that are too fine grained to identify.
These few thin sections provide evidence of the resourcefulness of the ancient tool knappers and their willingness to use a variety of different materials. It also indicates that they obtained rock by direct procurement or exchange from a considerable distance, more than 200 km to the northeast.