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Bird stones are prehistoric, abstract stone carvings made by Native Americans. The artifacts were a common inclusion in graves and thought to have ceremonial importance. They are noted for their distinctive simplicity and beauty. The exact purpose of these artifacts is not known, but most have a small hole drilled at the base of the neck and another at the aft end, presumably for mounting. Some theories suggest they were part of an atlatl (a short rod to hurl spears), in addition to their ceremonial uses (). Bird stones were mostly made east of the Mississippi, and the thousands in existence have been found primarily in New York, Ohio, Michigan and Wisconsin.〔''Encyclopædia Britannica'', Micropædia, Vol II at p36〕 The stones range in length from 3 to 6 inches, and have unique variations in style. Most are ground from grayish green, banded slate (). ==See also== *List of Stone Age art *Prehistoric art 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bird stone」の詳細全文を読む スポンサード リンク
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