Besides the most evident cosmic catastrophes ca. 2200 BC and 2345 BC there are other events during the Holocene that are so widely global and difficult to explain by only the Earth's own mechanisms that a cosmic explanation must evidently be taken into account. Posted on 01/03/2003 by ckilmer
Recent findings about interactions of the Earth with extraterrestrial bodies, particularly comets and Apollo-like objects, are reviewed, with special attention to climatological effects. We discuss the hypothesis that the last glaciation was started by a collision over a continent and was terminated by a collision over an ocean. Posted on 04/19/2002 by vannrox
The book Worlds in Collision is based upon the hypothesis that the events of clearly catastrophic nature described in ancient literature, particularly in the Bible, are phenomena that really happened, whose explanation cannot be given in a purely terrestrial context and must therefore be found in interactions between Earth and extraterrestrial bodies. Emilio Spedicato
Walk around weird, wildflower-covered hillocks in southwest Washington, by Beth Geiger
Mima Mounds Prairie is a geologically unique area consisting of large unexplained mounds that are either round or elliptical in shape, standing from one-half meter to about two meters in height, and having a diameter from two and one-half meters to three meters.
paper at Lunar and Planetary Science XXXVII (2006)
Discussion on Amorphous Silica glass found in the Egyptian Desert, New Scientist
Dr Benny Peiser discusses: There is no shortage of physical factors that can produce natural disasters and social deterioration. These could include catastrophes due to asteroid and comet impact, the failure of global agriculture due to volcanic super-eruptions, the reappearance of a new ice age, epidemic diseases, etc.
Clube and Napier suggested that the outer planets occasionally divert giant comets (more than 50 kilometers in diameter) into the inner solar system into short-period orbits.
At present scientists have identified nearly two hundred terrestrial impact craters. Three to four more craters are located each year. Most of these have only been discovered since 1950. Fewer visible craters appears on the Earth's surface as compared with most other solar system bodies because the Earth is so active geologically.
Underlying memories of an event that may have occurred many years ago
Space.Com article discussing possible role of cometary impacts in Human civilization
Big asteroids can be extra deadly when they strike the ocean, carving aquatic craters and sending huge waves in all directions.
In the most wide-ranging scenarios, the year 536 is seen as a watershed moment between the ancient and modern worlds, bringing about economic decline, population movements, political unrest, and ultimately the collapse of civilizations.
Compendium of correspondence, CCNet Editor: Benny Peiser
These scientists have been researching on-shore geological structures which may have been created by large cometary impact-driven tsunamis. The interesting article linked here describes their work is available at the New York Times.
In these videos, scientists answer questions and discuss their analysis of a buried layer at sites from California to Belgium which reveals materials including metallic microspherules, carbon spherules, nanodiamonds, fullerenes, charcoal, and soot. The layer's composition may indicate that a massive body, possibly a comet, exploded in the atmosphere over the Laurentide Ice Sheet 12,900 years ago.
3-Part Article By Diane Tennant in The Virginian-Pilot, September 7, 2008
Controversy as to the origin of the Carolina Bays has centered on terrestrial versus extraterrestrial theories. Meteoritic impact has been considered the primary causal mechanism in extraterrestrial models, but alternatives such as comets and asteroids have not been adequately considered. Comets may explode during fall and produce depressions which would conform to the morphology of the Bays. Only a comet appears to satisfy the constraints imposed both by extraterrestrial requirements and observed terrestrial characteristics.
Description of Landforms, Drainage Patterns, and Geologic Processes
The cometary theory of the origin of the Bays, on the other hand, popular among earth scientists of the 1930s and 40's, is that the Bays are the result of an encounter between North America and a low density comet exploding above or impacting with the Laurentide Ice Sheet ~12,900 years ago [4]. Supporting evidence includes the failure of "wind and wave" theories to satisfactorily account for a number of the peculiar features of Carolina Bays, including the recent identification of markers suggestive of an extraterrestrial connection, the alignment of bays with points over the Great Lakes, and their tendency to overlap one another from east to west. Extraterrestrial markers include microspherules, magnetic grains with extraterrestrial chemistry, carbon spherules suffused with nanodiamonds, and levels of iridium sixty times background levels.
Oblique impact resolves the mystery of one of the most bizarre crater pairs on the Moon. South of Mare Crisium in Mare Fecunditatis are two small craters with unique parallel rays streaming from one of them.
Metro Magazine interview with George Howard, by Liza Roberts, January 2009
During the recent years great progress has been made in the study of the processes of energy accumulation and transformation in the minerals used as palaeodosimeters, in clarification of the characteristics of especially deep “dosimetric” traps and in deciphering the mechanism of their photoionization, as well as in measuring techniques and development of new apparatus used for dating. In spite of that further basic studies, justification and specification of concrete dating protocols are needed. New measuring methods (including new dose-sensitive characteristics) are to be searched for. Sensitive methods for dating very “young” samples, but also extending the time range of datings to the region of great ages (t > 105 years) are especially necessary.
More than 350 bibliographic entries have been identified here, most of which pertain directly to Carolina Bays.
There is now compelling evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth-crossing orbit some time in the Upper Palaeolithic, and underwent a series of fragmentations. During this disintegration the Earth was probably subjected to occasional episodes of intense bombardment. Such an episode might constitute a sensible astronomical framework for understanding the postulated catastrophe at 12,900 BP.
A carbon-rich black layer, dating to 12.9 ka, has been previously identified at 50 Clovis-age sites across North America and appears contemporaneous with the abrupt onset of Younger Dryas (YD) cooling. The in situ bones of extinct Pleistocene megafauna, along with Clovis tool assemblages, occur below this black layer but not within or above it. Causes for the extinctions, YD cooling, and termination of Clovis culture have long been controversial. In this paper, we provide evidence for an extraterrestrial (ET) impact event at 12.9 ka, which we hypothesize caused abrupt environmental changes that contributed to YD cooling, major ecological reorganization, broad-scale extinctions, and rapid human behavioral shifts at the end of the Clovis Period
While most of us know about rings around Saturn and Jupiter, some scientists believe there once were rings of rock debris around our own planet. Two scientists — Peter J. Fawcett, of the University of New Mexico, and Mark B.E. Boslough, of the U.S. Department of Energy’s Sandia National Laboratories — have suggested that a geologically “recent” collision (about 35 million years ago) may have caused such a temporary debris ring.
Kehew, A. E. & Kozlowski, A. L. 2007. USA. Applied Quaternary research in the central part of glaciated terrain. Geological Survey of Fin- land, Special Paper 46, 69–78, 10 figures.