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Fort Hill State Memorial is an Native American earthwork located in Highland County, Ohio, United States. Built by the Hopewell culture, it is maintained by the Arc of Appalachia Preserve System and the Ohio History Connection. The earthwork, built about 2,000 years ago, is a walled enclosure made of soil on top of a flat summit. It is higher than nearby portions of Ohio Brush Creek and 800 higher than the Ohio River. It was made by the Hopewell people. It is over 1½ miles in circumference, enclosing . Thirty-nine "man-made openings" occur throughout the enclosure: thirty-six that are verified as being made by Indians and three others still unknown as to how they were made. The wall is 6–15 feet high and its total length is . It is 30 feet wide at its base in most areas. Archaeologists believe it was not used as a fort, but instead as a religious site.〔 In 1846, it was excavated by Ephraim George Squier and Edwin Hamilton Davis. It was featured in their book ''Ancient Monuments of the Mississippi Valley'', which was published in 1848.〔 Fort Hill State Memorial contains excellent outcrops of Silurian, Devonian, and Mississippian sedimentary bedrock and a natural bridge. The site is also an example of glacial stream reversal. It was named a National Natural Landmark in 1974.〔(National Registry of Natural Landmarks (June 2009, p. 74. ) Retrieved 25 November 2014.〕 ==Gallery== File:Fort Hill State Memorial.JPG|Fort Hill viewed from a distance. File:FortHill1.JPG|Entrance to Fort Hill. File:FortHill2.JPG|Fort Hill museum. Constructed and dedicated in August 1968. File:FortHill3.JPG|Monument to Morten Carlisle for his large responsibility for the establishment of Fort Hill State Memorial. Erected on May 21, 1950. 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「Fort Hill State Memorial」の詳細全文を読む スポンサード リンク
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