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Middle Ohio Valley people of the time were not known for building large earthworks, however; they did display a high regard for snakes as shown by the numerous copper serpentine pieces associated with them.

Historically, researchers first attributed the mound to the Adena culture (1000 BC - 1 AD).

When the team conducted carbon dating studies on the charcoal pieces, two yielded a date of ca.

1070 AD, with the third piece dating to the Late Archaic period some two thousand years earlier, specifically 2920 /-65 years BP (before the present). 2900 BP, was recovered from a core sample below cultural modification level.

three-foot-high prehistoric effigy mound on a plateau of the Serpent Mound crater along Ohio Brush Creek in Adams County, Ohio.

Maintained within a park by the Ohio History Connection, it has been designated a National Historic Landmark by the United States Department of Interior.

The Serpent Mound of Ohio was first reported from surveys by Ephraim Squire and Edwin Davis in their historic volume Ancient Monuments of the Mississippi Valley, published in 1848 by the newly founded Smithsonian Museum.

The earthwork had been built, however, by the early Hopewell culture (200 BC-500 AD) at least 1,000 years prior to the arrival of the Fort Ancient culture. Cameron (under the supervision of the Ohio Historical Society's Bradley T.The Fort Ancient culture was influenced by the contemporary Mississippian culture society based along the mid-Mississippi River valley with its North American center at Cahokia (in present-day Illinois).The Mississippian culture had regional chiefdoms as far south as present-day Louisiana and Mississippi, as well as extending to western North Carolina and north to the Great Lakes area.In addition, contemporary American Indians have an interest in the site.

Several attributions have been entered by academic, philosophic, and Native American concerns regarding all three of these unknown factors of when designed, when built, and by whom.Originally thought to be Adena in origin, a 1996 carbon dating study led scholars to believe the mound was built by members of the Fort Ancient culture around 1070 CE.Including all three parts, the Serpent Mound extends about 1,376 feet (419 m), and varies in height from less than a foot to more than three feet (30–100 cm).Recently the dating of the site has been brought into question.