An FR thread with the same title:
Great Comets, Great FloodsAuthors Edith Kristan-Tollmann and Alexander Tollmann, both of the University of Vienna's Geological Institute in Austria, suggest that a cometary crash is the cause of the flood we usually associate with Noah... By combining historical record with geological clues, the Tollmanns picture several cometary fragments -- probably seven of them -- smacking into the earth about ten thousand years ago. The great splashdown took place near the autumnal equinox in the Northern Hemisphere, spring in the Southern, with the major fragments hitting the oceans over a span of days at most. (Oddly, the Tollmanns are less certain of the year than of the time of year; because of the many internal clues in the tales and commentaries worldwide, Mesopotamian and Scandinavian sources agree on the season.) ...The geologic evidence is--or should be--less arguable. The Tollmanns think they've found described in the scientific literature a worldwide array of tektites of the right age, for example. Tektites are rocks melted by an impact and splashed away as molten drops that then solidify again as they cool. Because they are inorganic, they are usually dated by stratigraphy -- the age of the layers within which they lie -- and that is an admittedly imperfect science.
by Carla Helfferich
Alaska Science Forum
July 13, 1994
There was a hiatus in Sumerian Culture around this time, I will be damed if I can remember the reference. It was noticed by people doing the early digs, correct me if I am wrong.