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[QUOTE]Originally posted by DD'eDeN: [QB] http://www.dailymail.co.uk/sciencetech/article-3729748/The-origin-dirt-Plant-fossils-suggest-soil-began-covering-planet-20-million-years-earlier-believed.html Dirt began 400ma https://www.newscientist.com/article/2100364-some-of-the-earliest-plants-took-root-by-growing-up-not-down/ The environmental conditions in the area are the probable explanation, Xue says. Sediment often accumulates in floodplain settings, and Xue thinks the Drepanophycus plants in the area were constantly being swamped by sand and silt. They responded by growing ever-upwards to stay at the surface. In other words, the rhizomes didn’t grow down through 15 metres of sand and silt; they actually grew upwards by that amount as the land gradually rose. At any one time it was probably only the rhizomes in the top few centimetres that were alive, says Xue. Even so, the underground network of dead rhizomes would have helped stabilise the sediment – an important first step on the way to developing the first deep soils. “The importance of rhizomes in the early colonisation of terrestrial environments has been overlooked,” says Xue. “It’s a spectacular sequence of sediments,” says Paul Kenrick at the Natural History Museum in London. He points out that Drepanophycus doesn’t appear to have been making soils as we would recognise them today. “It’s not creating a structured soil profile, more of a stabilised sediment,” he says. But there is little evidence of those thick, organically stabilised sediments elsewhere in the world at the time. “It’s important in that respect,” he says. [/QB][/QUOTE]
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