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A 2023 paper in American Antiquity re-dated the six largest Hopewell earthwork sites in Ohio with 424 radiocarbon dates and a strict screen for contaminated samples. The result: the whole Ohio Hopewell complex, the geometric enclosures, the mounds, the copper and obsidian, the wooden circles, went up in about 250 years, not the 700 the textbooks allowed. Randall reads the paper on camera, then asks the question the authors do not: who builds on that scale, that fast, with shared measurement and sky alignment, and why does archaeology still call it a cult?
Randall walks through the study by Mark F. Seeman of Kent State and Kevin C. Nolan of Ball State: the six sites, the Hopewell Mound Group, Liberty, Mound City, Seip, Tremper and Turner, the chronometric hygiene that threw out weak dates, and the new span that puts the peak of Hopewell building about 2,000 years ago, right as the vernal equinox crossed from Aries into Pisces. He reads the authors' own list of what defines Hopewell: large geometric earthworks, submound buildings, puddled clay altars, Ross barbed spears, copper breastplates and headplates, effigy boatstones, a common set of measurements, and celestial observation not seen in any earlier culture, plus the massive circular wooden enclosures that geophysics has now added to the list. A woodhenge, in Ohio.
Then the Turner Group in Hamilton County: a long enclosure nearly half a mile long, a great enclosure 1,500 feet by 950, an elevated circle 600 feet across, surveyed in 1887 and bulldozed for gravel after World War II. Randall's argument: the Hopewell were not a local cult with a vague ceremonial purpose. The geometry, measurement and astronomy tie these sites to the same template found across the ancient world, and that template is technological, and by implication scientific. Accepting it overturns ancient history as we have been taught it.
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IN THIS EPISODE
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- 424 radiocarbon dates from six Ohio Hopewell sites, and what chronometric hygiene means
- 700 years becomes 250: the Hopewell built almost three times faster than believed
- The peak of Hopewell construction and the dawn of the Age of Pisces
- Why the authors' "socio-religious movement" explains nothing
- Ross barbed spears, copper headplates, effigy boatstones, puddled clay altars
- Ohio's woodhenges and the timber circles of the British Isles
- The Turner Group survey of 1887, and the gravel quarry that erased it
- Why the Hopewell phenomenon is technological, and what that does to ancient history
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CHAPTERS
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00:00 The Hopewell phenomenon and a new paper
00:43 Seeman and Nolan: 424 radiocarbon dates, six Ohio sites
02:56 A climax 2,000 years ago and the Piscean Age
03:56 Broad distribution, short duration: 700 years becomes 250
05:51 What "agental" means
06:31 A socio-religious movement? What the authors leave unexplained
09:06 The Hopewell toolkit: earthworks, altars, spears, copper, woodhenges
11:26 One template across the ancient world
12:01 The Turner Group: the 1887 survey and the site quarried away
13:18 Technological, not primitive: why archaeology will not see it
14:36 The paper
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THE PAPER
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Seeman, Mark F., and Kevin C. Nolan. 2023. Building the Ohio Hopewell Chronology: An Incremental Approach to Historical Reckoning. American Antiquity 88(2):144-162. Open access.
https://doi.org/10.1017/aaq.2023.6