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[QUOTE]Originally posted by DD'eDeN: [QB] 4ka flood in China - Yellow River dammed Geologists have found evidence for an ancient megaflood which they say is a good match for the mythical deluge at the dawn of China's first dynasty. The legend of Emperor Yu states that he tamed the flooded Yellow River by dredging and redirecting its channels, thereby laying the foundations for the Xia dynasty and Chinese civilisation. Previously, no scientific evidence had been found for a corresponding flood. But now a Chinese-led team has placed just such an event at about 1,900BC. Writing in Science Magazine, the researchers describe a cataclysmic event in which a huge dam, dumped across the Jishi Gorge by a landslide, blocked the Yellow River for six to nine months. The sediments from this outburst flood are up to 20m thick and up to 50m higher than the Yellow River - indicating an unprecedented, devastating flood Dr Wu Qinglong, Nanjing State University When the dam burst, up to 16 cubic kilometres of water inundated the lowlands downstream. The evidence for this sequence of events comes from sediments left by the dammed lake, high up the sides of Jishi Gorge, as well as deposits left kilometres downstream by the subsequent flood. Lead author Dr Wu Qinglong, from Nanjing Normal University, said he and colleagues stumbled on sediments from the ancient dam during fieldwork in 2007. "It inspired us to connect the next possible outburst flood with the abandonment of the prehistoric Lajia site 25km downstream," he told journalists in a teleconference. "But at that time we had no idea what the evidence of a catastrophic outburst flood should be." The Lajia site, famously home to the world's oldest noodles, is known as China's Pompeii; its cave dwellings and many cultural artefacts were buried by a major earthquake. The Yellow River near the Lajia siteImage copyright Wu Qinglong Image caption Researchers found tell-tale flood deposits around the Guanting basin, near the Lajia site "In July 2008 I suddenly realised that the so-called black sand previously revealed by archaeologists at the Lajia site could be, in fact, the deposits from our outburst flood," Dr Wu said. It's among the largest known floods to have happened on Earth during the past 10,000 years Dr Darryl Granger, Purdue University "The subsequent investigation confirmed this speculation and showed that the sediments from this outburst flood are up to 20m thick, and up to 50m higher than the Yellow River - indicating an unprecedented, devastating flood." [/QB][/QUOTE]
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