Fullerenes found in Carolinas and that is maybe same area the Clovis-like spear points are found in French caves.
..."We propose that the YD event resulted from multiple ET airbursts along with surface impacts. We further suggest that the catastrophic effects of this ET event and associated biomass burning led to abrupt YD cooling, contributed to the late Pleistocene megafaunal extinction,
promoted human cultural changes, and led to immediate decline in some post-Clovis human populations (
19)."....
..."In the 1990s, W. Topping (
14) discovered magnetic microspherules and other possible ET evidence in sediment at the Gainey PaleoAmerican site in Michigan (see also ref.
15), and Lougheed (
16) and Bi (
17) reported that late Pleistocene glacial drift contained similar
cosmic spherules. We now report substantial additional data from multiple, well dated stratigraphic sections across North America supporting a major ET airburst or collision near 12.9 ka. Directly beneath the black mat, where present, we found a thin, sedimentary layer (usually <5 cm) containing high concentrations of magnetic
microspherules and grains, nanodiamonds, iridium (Ir) at above background levels, and fullerenes containing ET helium. These indicators are associated with charcoal, soot,
carbon spherules, and
glass-like carbon, all of which suggest intense wildfires. Most of these markers are associated with previously recorded impacts, but a few are atypical of impact events. We identify this layer as the YD boundary (YDB), and we refer to this incident as the YD event.
....At the sites studied, independent radiocarbon (
1) and optically stimulated luminescence dates that tend to cluster near 13 ka were used to establish the age of the YDB. For example, the end-Clovis stratum (the YDB) is well dated at Murray Springs, AZ, (eight dates averaging 10,890 14C yr or calendar 12.92 ka) and the nearby Lehner site (12 dates averaging 10,940 14C yr or 12.93 calendar ka). Haynes (
2) correlated the base of the black mat (the YDB) with the onset of YD cooling, dated to 12.9 ka in the GISP2 ice core, Greenland (see GISP2 chronology in
SI Fig. 6) (
18). Therefore, we have adopted a calendar age of 12.9 ± 0.1 ka for the YD event.
http://www.pnas.org/content/104/41/16016.full