Text #9356"Tollmann's Hypothetical Bolide", in .
Alexander Tollmann’s bolide, proposed by Kristan-Tollmann and Tollmann in 1994, is a hypothesis presented by Austrian geologist Alexander Tollmann, suggesting that one or several bolides (asteroids or comets) struck the Earth at 7640 BCE (±200), with a much smaller one at 3150 BCE (±200). If true, this hypothesis explains early Holocene extinctions and possibly legends of the Universal Deluge.
The claimed evidence for the event includes stratigraphic studies of tektites, dendrochronology, and ice cores (from Camp Century, Greenland) containing hydrochloric acid and sulfuric acid (indicating an energetic ocean strike) as well as nitric acids (caused by extreme heating of air).
Kristan-Tollmann, E. and A. Tollmann, 1994, “The youngest big impact on Earth deduced from geological and historical evidence”. Terra Nova. v. 6, no. 2, pp. 209–217.
Glass, B.P., 1978, “Australasian Microtektites and the Stratigraphic Age of the Australites”. Bulletin of the Geological Society of America. v. 89, no. 10, pp. 1455–1458.
Izokh, E.P., 1988, “Age-paradox and the Origin of Tektites” in J. Konta, ed., 2nd international conference on natural glasses Abstracts – International Conference on Natural Glasses-Prague, Czechoslovakia, 1988. v. 2, pp. 379–384.
Prasad, N.S. and P.S. Rao, 1990, “Tektites Far and Wide”. Nature. v. 347, no. 6291, pp. 340.