The Earth sank twice, flooding the Western Amazon

The Earth sank twice, flooding the Western Amazon 05/10/2017 12:46 PM EDT A tiny shark tooth, part of a mantis shrimp and other microscopic marine organisms reveal that as the Andes mountains rose, the Western Amazon sank twice, each time for less than a million years. Full story at http://newsdesk.si.edu/releases/smithsonian-scientists-find-earth-sank-twice-flooding-western-amazon Source Smithsonian Tropical Research Institute This is an NSF News From the Field item.   Follow NSF:  This email was sent using GovDelivery, on behalf of: National Science Foundation Update · 4201 Wilson Boulevard · Arlington, VA 22230 · 703-292-5111