Part 6: Green River Shale (Eocene, Wyoming/Utah/Colorado, USA)
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Q: What environment was the Green River Shale deposited in?
A: Subtropical lakes and ponds with varied salinity
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Q: What fossils are preserved here?
A: Fish (preserved in remarkable detail), stingrays, birds, bats, insects, palm leaves
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Q: Why is preservation so good?
A: Anoxic deep lake conditions prevented scavenging; cold periods helped fish sink quickly
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