No. 135: MAY-JUN 2001
The claims. In the authors' words:
Our research indicates that the entire Great Lakes region (and beyond) was subjected to particle bombardment and a catastrophic nuclear irradiation that produced secondary thermal neutrons from cosmic ray interactions. The neutrons produced unusually large quantities of 239Pu and substantially altered the natural uranium abundances (235U/238U) in artifacts and in other exposed materials including cherts, sediments, and the entire landscape. These neutrons necessarily transmuted residual nitrogen (14N) in the dated charcoals to radiocarbon, thus explaining anomalous dates.Some North American dates may in consequence be as much as 10,000 years too young. So, we are not dealing with a trivial phenomenon!
Supporting evidence. Four main categories of supporting evidence are claimed and presented in varying degrees of detail.
The authors claim that the burst of radiation from a nearby supernova, circa 12,500 years ago, not only reset radiocarbon clocks but also heated the planet's atmosphere, melted ice sheets, and led to biological extinctions.
If verified, the claimed phenomenon would also "reset" archeological models of the settlement of North and South America. To illustrate, we may have to add as many as 10,000 years to site dates in much of North America!
(Firestone, Richard B., and Topping, William; "Terrestrial Evidence of a Nuclear Catastrophe in Paleoindian Times," The Mammoth Trumpet, 16:9, March 2001. Cr. C. Davant III. This off-mainstream journal is published by the Center for the Study of the First Americans, 355 Weniger Hall, Oregon State University, Corvallis, OR 97331-6510.)
Comment. Thus we add another potential cause of an often-hypothesized, 12,500-BP catastrophe that is said to have changed the world's history. Competing theories involve asteroid impact, volcanism, a Venusian side-swipe, etc.
Sites discussed in the region purported to have been zapped by a burst of neutrons circa 12,500 B.P.
Other Sites of Interest