Period Time Frame (Millions of Years Ago) Relevance to the Amazon Cretaceous 145 – 66 Formation of the Andes; inland seas drain. Miocene 23 – 5 Established river system flowing to the Atlantic.
Amazon River Deep History Revealed: Tracing the Ancient Flow of Prehistoric Waters
These climatic shifts caused the river to shrink and expand repeatedly. Forests retreated, and the river fragmented into isolated lakes and streams.
During the Ice Ages, sea levels dropped, and the Amazon Basin experienced extreme dry periods. The current Amazonian rainforest is relatively young, but the riverbed itself is much older, acting as a stable corridor for life through these volatile environmental changes.
Amazon River Deep History Revealed: Tracing Ancient Flows and Climate Shifts
The Prehistoric Waters Long before the Amazon River took its current form, the continent hosted a vast inland sea. Climate Cycles and Evolution Answering how old is the Amazon River isn't just about a single date; it's about understanding a dynamic system.
More About How old is the amazon river
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