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At high and in diameter, the Grave Creek Mound in the Ohio River Valley in West Virginia is one of the largest conical-type burial mounds in the United States. The builders of the site, members of the Adena culture, moved more than 60,000 tons of dirt to create it about 250–150 BC. The earthwork mound is located in present-day Moundsville near the banks of the Ohio River. The first recorded excavation of the mound took place in 1838, and was conducted by local amateurs. The largest surviving mound among those built by the Adena, it has been designated a National Historic Landmark. In 1978 the state opened the Delf Norona Museum at the site. It displays numerous artifacts and interprets the ancient Adena Culture. In 2010, under an agreement with the state, the US Army Corps of Engineers gave nearly 450,000 artifacts to the museum for archival. These were recovered in archeological excavations at the site of the Marmet Lock, and represent 10,000 years of indigenous habitation. ==Description== Grave Creek Mound is the largest conical type of any of the mound builder structures. Construction of the mound took place in successive stages from about 250–150 B.C., as indicated by the multiple burials at different levels within the structures. In 1838, road engineers measured its height at and its base as . Originally a moat of about in width and five feet in depth, with one causeway across it, encircled the mound. Inside the mound, archaeological researchers have discovered Adena Hopewell remains and ornaments, along with a small sandstone tablet. The authenticity of the tablet and the meaning of its inscription is quite controversial. 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「Grave Creek Mound」の詳細全文を読む スポンサード リンク
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