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The Rupes Nigra ("Black Rock"), a phantom island, was believed to be a black rock located at the Magnetic North Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
Inventio Fortunata (also Inventio Fortunate, Inventio Fortunat or Inventio Fortunatae), "Fortunate, or fortune-making, discovery", is a lost book, probably dating from the 14th century, containing a description of the North Pole as a magnetic island (the Rupes Nigra) surrounded by a giant whirlpool and four continents.
The 5-acre site is located on a bluff above the Little Miami River about 5 miles upstream from the Ohio River. While occupied over hundreds of years, it was settled most intensively in the late sixteenth and early seventeenth centuries, and is the most excavated Fort Ancient site of this time period. [ 3 ]
The mound today stands 30 feet (9.1 m) in height and is the sole intact feature of the earthworks. [2] The ditch surrounding the mound is 15 feet (4.6 m) in width and 4 feet (1.2 m) deep, with its surrounding embankment measuring 20 feet (6.1 m) across its base and 585 feet (178 m) in circumference.
This list of the prehistoric life of Ohio contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Ohio.
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The Fort Ancient earthworks were built in at least three stages over an estimated 400-year period. The shoulder blades of deer, split elk antlers, clam shell hoes, and digging sticks were used to loosen the dirt, and baskets holding 35 to 40 pounds were used to carry and distribute the soils in building the earthworks.
However, Barnesville shares many similarities with other petroglyph sites in western Pennsylvania, northern West Virginia, and other parts of eastern Ohio; as a result, petroglyph specialist James L. Swauger concluded that it was the work of the people that also created such sites as the Indian God Rock, the Sugar Grove Petroglyphs, and the ...