By 7500 B.C., Kentucky’s Indian culture changed. Large game
animals died out, and the Archaic Indians now depended on
fishing and efficient gathering of wild foods as well as
hunting. Stone tools, ground to the desired shape, appeared.
Artifacts such as grooved axes, conical and cylindrical
pestles, bone awls, and cannel coal beads also have been
found from this period. A unique feature of the Archaic
period was the “hominy hole,” a particular type of depression
worn in sandstone by grinding or pulverizing. Despite its
name, the hominy hole was probably used for grinding up
nuts or seed; corn (from which hominy is made) was not grown
in Kentucky until the Woodland period, about 1500 B.C.
(Information from KET.)

(Geologist's hammer is for size reference)