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Projectile point
In archaeological terms, a projectile point is an object that was hafted to a projectile, such as a spear, dart, or arrow, or perhaps used as a knife.
Stone tools, including projectile points, can survive for long periods, were often lost or discarded, and are relatively plentiful, providing useful clues to the human past, including prehistoric trade. Scientific techniques exist to track the specific kinds of rock or minerals that used to make stone tools in various regions back to their original sources. Occasionally, projectile points made of worked bone or ivory are found at archaeological sites. In regions where metallurgy had emerged, projectile points were made from copper, bronze, or iron. In North America, some late prehistoric points were fashioned from copper that was mined in the Lake Superior region and elsewhere.
== History ==
A large variety of prehistoric arrowheads, dart points, and spear points have been discovered. Flint, obsidian, quartz and many other rocks and minerals were commonly used to make points in North America. The oldest projectile points found in North America were long thought to date from about 13,000 years ago, during the Paleo-Indian period, however recent evidence suggests that North American projectile points may date to as old as 15,500 years. Some of the more famous Paleo-Indian types include Clovis, Folsom and Dalton points.〔(Authentic Artefacts Collectors Association )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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