Tollmann's bolide hypothesis

Christopher Knight and Robert Lomas in their book, Uriel's Machine, argue that the 7640 BCE evidence is consistent with the dates of formation of a number of extant salt flats and lakes in dry areas of North America and Asia.

This process has led to submerging substantial portions of coastal areas adjacent to continental ice sheets and resulted in the accumulations of marine sediments and fossils within them.

[19] Thus, the change from freshwater to salty water and eventually salt flats started over 2,400 to 6,400 years before the oldest of the impacts hypothesized by the Tollmann bolide hypothesis occurred.

Thousands of paleoenvironmental records constructed from the study of lakes, bogs, mires, and river valleys all over the world by palynologists have not shown the existence of such a megatsunami.

These records do not recognise indications of either a resulting catastrophic environmental devastation or layers of tsunami deposits, which the mega-tsunamis postulated by Tollmann's bolide hypothesis would have created.

Grimm et al. in a paper published in Science in 1993,[25] documented a 50,000-year-long record of environmental change by the analysis of pollen from an 18.5 m (61 ft) core from Lake Tulane in Highland county, Florida.

[1] Despite its location, both the core and the pollen record recovered from Lake Tulane lacks any indication of an abrupt, catastrophic environmental disruption,[25] which the mega-tsunamis proposed by Tollmann's bolide hypothesis would have caused.

The cataclysmic scale of physical and ecological destruction that a megatsunami, like the one proposed by Kristan-Tollmann and Tollmann,[1] would have caused, has not been recognised within the majority of long-term environmental records.

Other megatsunamis have been shown in coastal sediments analysed by geologists and palynologists and point to tsunamis locally caused by either earthquake, volcanic eruptions, or submarine slides.