First Fossil-bearing Amber Discovered In Western Amazonian Basin By American Museum Of Natural History Paleontologist And Colleagues | AMNH https://www.amnh.org/research/science-news/2006/first-fossil-bearing-amber-discovered-in-western-amazonian-basin-by-american-museum-of-natural-history-paleontologist-and-colleagues
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upper lignite level at the amber locality, western Amazon