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Carbon dating of samples of fossil tufas, a type of limestone which is deposited in the presence of high groundwater levels, has revealed that there have historically been two periods when the Eastern Desert was significantly wetter than it is today. These occurred in the late Pleistocene age, around 100,000 years ago, and the mid Holocene age, around 6,000 years ago. The most recent wet period is known to have been a result of summer monsoonal

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