Kenneth Barnett

Clube V, Napier B. The Cosmic Serpent: A Catastrophist View of Earth History. Universe Books. New York: 1982 Burke JG. Cosmic Debris: Meteorites in History. University of California Press. Berkley: 1986 Firestone RB, West A, Kennett JP, Becker L, Bunch TE, Revay ZS, Schultz PH, Belgya T, Kennett DJ, Erlandson JM, et al.. Evidence for an Extraterrestrial Impact 12,900 Years Ago that Contributed to the Megafaunal Extinctions and the Younger Dryas Cooling. Proc. Natl. Acad. Sci. 2007. Vol. 104(41):16016–16021.

Abstract Meteorites, Fe and Si-rich microspherules, positive Ir and Pt anomalies, and burned charcoal-rich Hopewell habitation surfaces demonstrate that a cosmic airburst event occurred over the Ohio River valley during the late Holocene. A comet-shaped earthwork was constructed near the airburst epicenter. Twenty-nine radiocarbon ages establish that the event occurred between 252 and 383 CE, a time when 69 near-Earth comets were documented.