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The modern Amazon lowlands date from the mid-Cenozoic, when the Andean orogeny defined an eastward, or northward draining basin of immense size. As the Andean orogeny continued throughout the Neogene and Quaternary periods, this system approached a steady state, with Andean flanks eroding to fill subsiding basins along the Andean foreland, followed by secondary erosion of sediments and transport in...
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