Forty-one implements are classified as choppers or hammerstones.
Seventy percent of these are of rock quartz, 20 percent of a
metamorphic rock, usually schist, and 10 percent of a grainy quartzite.
Due to the nature of the material it is extremely difficult to
determine whether such artifacts were used primarily as hammerstones
or choppers. There are no small round heavily battered specimens which
could be considered as hammerstones only. The pieces usually exhibit
one sharp edge and one or more blunt battered edges. The first two
lithic materials mentioned fracture rather easily, and the tools
were probably used and discarded at will. Rock quartz and various
metamorphic rocks are plentiful in the area, making such careless use
practical; quartzite and flinty materials are rather scarce, (see
below). The largest of these tools measures 5 × 5½ inches, the smallest
1¼ inches square.