Researchers continue to expand the case for the Younger Dryas Impact hypothesis.
The idea proposes that a fragmented comet smashed into the Earth's atmosphere 12,800 years ago, causing a widespread climatic shift that, among other things, led to the abrupt reversal of the Earth's warming trend and into an anomalous near-glacial period called the Younger Dryas.
The Earth is bombarded every day by tons of celestial debris, in the form of tiny dust particles. On the other end of the scale are the extremely rare and cataclysmic impacts like the Chicxulub event that 65 million years ago caused the extinction of dinosaurs and other species. Its 150-kilometer-wide impact crater can be found in the Yucatán Peninsula in Mexico.
"In the extreme form, such as when an asteroid hammers into the Earth's surface, all the fractures are very parallel," Kennett explained. In the realm of cosmic airbursts, different variables are present in the realm of cosmic airbursts."When you think about it, the pressures and temperatures that produce these fractures will vary depending on the density, entry angle, altitude of the impact and the impactor's size.
These lower-pressure shocked quartz grains join a growing suite of impact proxies that together make a case for a fragmented comet that not only caused widespread burning, but also abrupt climatic change that resulted in the extinctions of 35 genera of megafauna in North America, such as the mammoths and giant ground sloths, and led to the collapse of a flourishing human culture called Clovis, according to the researchers.
Comets And Meteors Cosmic Rays Astronomy Near-Earth Object Impacts Global Warming Atmosphere Early Climate Paleontology Fossils
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