Silver Mound Plant

银丘是威斯康星州的一座砂岩山丘，美洲印第安人在那里开采石英岩作为石器。由Silver Mound的石英岩制成的工具早在肯塔基州就被发现。最古老的可以追溯到大约 11,000 年前，因此它们提供了有关威斯康星州第一批人的线索。银冢考古区于2006年被宣布为国家历史地标。

Streetside

鸟瞰图

附近

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