A huge 3-million-year-old canyon, thousands of feet deep in places, has been discovered buried under a major river in Tibet.
The canyon buried along the Yarlung Tsangpo (called the Brahmaputra in India) in south Tibet was discovered by a team of researchers from California Institute of Technology (Caltech) and the China Earthquake Administration.
The geologists say that the ancient canyon — thousands of feet deep in places — effectively rules out a popular model used to explain how the massive and picturesque gorges of the Himalayas became so steep, so fast.
Last year, civil engineers from the China Earthquake Administration collected cores by drilling into the valley floor at five locations along the Yarlung Tsangpo.
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