Forests retreated, and the river fragmented into isolated lakes and streams. The Prehistoric Waters Long before the Amazon River took its current form, the continent hosted a vast inland sea.
Amazon River Formation Milestones: Tracing the River's Ancient Origins
For a long time, scientists debated whether the river flowed westward into the Pacific before reversing its course. These climatic shifts caused the river to shrink and expand repeatedly.
Period Time Frame (Millions of Years Ago) Relevance to the Amazon Cretaceous 145 – 66 Formation of the Andes; inland seas drain. The Andes: Architect of the River The age of the Amazon is inseparable from the growth of the Andes.
The Andean Formation and River Genesis
Current evidence strongly supports the "Andean capture" theory. Determining how old is the Amazon River requires piecing together evidence from geology, paleontology, and hydrology.
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