For a long time, scientists debated whether the river flowed westward into the Pacific before reversing its course. Biodiversity and the Ancient Flow.
How the Andes Shaped the Amazon River's Ancient Course
Current evidence strongly supports the "Andean capture" theory. Determining how old is the Amazon River requires piecing together evidence from geology, paleontology, and hydrology.
Understanding its timeline helps us comprehend the biodiversity and ecological importance of the world’s largest river system. Period Time Frame (Millions of Years Ago) Relevance to the Amazon Cretaceous 145 – 66 Formation of the Andes; inland seas drain.
How the Andes Captured the Amazon River: Decoding the Ancient Relationship
As the mountains rose over the past 25 million years, they created a rain shadow and forced moisture-laden winds to release their precipitation into the basin. During the Ice Ages, sea levels dropped, and the Amazon Basin experienced extreme dry periods.
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