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Researchers also uncovered celts, or ax heads, made from shell and stone, including some made from basalt that likely came from the distant Appalachians.

On June 4, during a break from working on the structure, he held a celt - a polished, cylindrical, foot-long piece of stone used as a woodworking tool by prehistoric native Americans.

“A celt is a kind of battle-axe,” said Arthur, surprising the magician with this piece of information more than he had been surprised for several generations.

The primitive celt, which was hardly more than a wedge, has been differentiated into three modern hand tools, the chisel, see above, p.

They indicate some practical knowledge of the cleavage of silicious rocks, but they show no power of producing even such finish as the celts frequently exhibit.