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Silver Mound Archeological District
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Silver Mound Archeological District : ウィキペディア英語版
Silver Mound Archeological District

Silver Mound is a sandstone hill in Wisconsin where American Indians quarried quartzite for stone tools. Tools made from Silver Mound's quartzite have been found as far away as Kentucky. The oldest have been dated to around 11,000 years ago, so they provide clues about the first people in Wisconsin.〔(【引用サイトリンク】url=http://www.uwlax.edu/mvac/specificsites/silvermound.htm )〕 Silver Mound Archeological District was declared a National Historic Landmark in 2006.〔
==Geography and Geology==

Silver Mound is in the town of Hixton, Jackson County, Wisconsin. Its sandstone was laid down long ago in the Cambrian Period, like many other bluffs in the area. But in this sandstone a layer of very hard stone called silicated quartzite or orthoquartzite formed. Stone like this is fairly uncommon. With simple tools it can be broken into pieces and shaped into points through a process called knapping. And this quartzite from Silver Mound can be distinguished by technical analyses from similar orthoquartzite from other locations.〔

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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