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Simpson point : ウィキペディア英語版 | Simpson point The Simpson point is a Paleo-Indian projectile point with a wide blade noted for exhibiting a narrowed 'waist' (middle section). It also features a concave base and eared basal corners. It was named in 1962 by Ripley P. Bullen. Points are mostly dated to 9000BC and are considered to be a typical example of the Middle Paleo-Indian subperiod (9000-8500 BC). ==References==
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「Simpson point」の詳細全文を読む
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