In archaeology, ground stone is a category of stone tool formed by the grinding of a coarse-grained tool stone, either purposely or incidentally. Ground stone tools are usually made of basalt, rhyolite, granite, or other macrocrystalline igneous stones whose coarse structure makes them ideal for grinding other materials, including plants and other stones. In Europe the adoption of ground stone technology is associated closely with the Neolithic. In the Levant ground stones appear in Mesolithic 2 (Natufian).
Some ground stone tools are incidental, caused by use with other tools: manos, for example, are hand stones used in conjunction with metates and other grinding slabs (querns), and develop their ground surfaces through wear. Other ground stone tools include adzes, celts, and axes, which are manufactured using a labor-intensive, time-consuming method of repeated grinding against a harder stone or with sand, often using water as a lubricant. These tools are often made using durable finer-grained materials rather than coarse materials. In the North American arctic, tools made of ground slate were used by the Norton, Dorset, and Thule tool cultures. Common forms of these tools were projectile points and ulus.
Famous quotes containing the words ground and/or stone:
“Every act of the man inscribes itself in the memories of his fellows, and in his own manners and face. The air is full of sounds; the sky, of tokens; the ground is all memoranda and signatures; and every object covered over with hints, which speak to the intelligent.”
—Ralph Waldo Emerson (1803–1882)
“It is remarkable that the dead lie everywhere under stones.... Why should the monument be so much more enduring than the fame which it is designed to perpetuate,—a stone to a bone? “Here lies,”M”Here lies”;Mwhy do they not sometimes write, There rises? Is it a monument to the body only that is intended?”
—Henry David Thoreau (1817–1862)