Mysterious Black Mats on Earth Not From Outer Space
What seemed like evidence of prehistoric cosmic impacts might just be clumps of earthly dust, findings that shed light on the heated debate over whether these impacts triggered recent mass extinctions, researchers say.
A giant cosmic collision with Earth and an asteroid or comet is now the leading culprit behind the mass extinction that ended the Age of Dinosaurs about 65 million years ago. However, there is much controversy regarding whether a cosmic explosion, or something else, caused a more recent mass extinction — the one that wiped out most of the large mammals in North America as well as the so-called Clovis people about 12,900 years ago.
Link for the rest of the article: http://news.yahoo.com/mysterious-black- ... 01558.html
Younger Dryas impact hypothesis evidence disputed
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Younger Dryas impact hypothesis evidence disputed
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"Damn with faint praise, assent with civil leer, and, without sneering, teach the rest to sneer." ~ Alexander Pope