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Broecker and his colleagues accepted presence of these much lower dates and suggested that whole matter was complicated by fact that there had been an estimated 200-year resurgence of glacial conditions, known as Valders re-advance, around mid-ninth millenium BC. They therefore acknowledged that their own findings might in fact relate to recession of ice fields after this time, bringing dates of their suggested 'major fluctuation in climate' and 'sharp change in oceanic conditions' down to well below c. 9000 BC. (13)
THE EVIDENCE OF POLLEN SPECTRA
Further evidence that dramatic changes accompanied transition from glacial to post-glacial ages came from work of Herbert E. Wright Jnr, of School of Earth Sciences at University of Minnesota, Minneapolis, (14) and J Gordon Ogden III of Department of Botany and Bacteriology at Ohio Wesleyan University, Delaware. (15) Both examined pollen spectra range from sediment cores taken from various lake sites in Great Lakes area and found they provided clear evidence of an abrupt shift in flora at end of glaciation. The spruce forests that had thrived in cold harsh climate for many thousands of years were supplanted swiftly, first by pine and then by mixed hardwood forests, such as birch and oak. Deciduous trees, as we know, only thrive in a warmer climate.
The significance of these findings is acceleration at which this transition took place. In an article for journal 'Quaternary Paleoecology' in 1967, Ogden pointed out that some pollen spectra samples showed a 50 per cent replacement from spruce to pine occurring in just 10 centimetres of sediment. (16) In one sample taken from a site named Glacial Lake Aitken in Minnesota, transition from 55 per cent to 18 per cent spruce pollen occurred in only 7.6 centimetres of sediment, re- presenting a deposition corresponding to just 170 years. (17) The problem here is that conventional geologists and paleoecologists consider that transition from glacial to post-glacial ages occurred over several 'thousand' years, not just a few hundred {The time it takes for one or two trees to live and die.} years.
These findings so baffled Ogden that he was led to comment: 'The only mechanism sufficient to produce a change of kind described here would therefore appear to be a rapid and dramatic change in temperature and/or precipitation approximately 10,000 years ago.’ (18)
What kind of climatic 'event' might have been responsible for this 'rapid and dramatic change in temperature’ {Could this relate to buttercups found frozen and undigested in Mammoth mouths of Arctic?} in American Midwest, sometime around c. 8000 BC? Had it been a consequence of proposed cometary impact that devastated western hemisphere during this same epoch?
The knowledge that some 65 million years ago Cretaceous period had been abruptly brought to a close by just such an impact has softened most stubborn of minds concerning such a possibility. Broecker himself, in an article written for 'Scientific American' in 1983, now accepted that asteroid or comet impacts might be responsible for instigation and termination of glacial ages. (19)
This is indeed what Emilio Spedicato has suggested as mechanism behind revolution in climate and ocean temperature experienced during this period…” (20)
We will return to implications related to this and work of Mr. Collins throughout this encyclopedia as we develop real history from actual facts rather than Bible Narrative. It should be evident that these climate changes had significant impacts on society and created a loss of culture and technology in certain areas of world. There were probably people who took advantage of these spiritual and other perceptions that resulted as well.
Author of Diverse Druids World-Mysteries.com guest 'expert' Columnist for The ES Press Magazine