Gregg F. Gunnell (editor). Eocene Biodiversity: Unusual Occurrences and Rarely Sampled Habitats. 2001. Kluwer Academic/Plenum Publishers, New York, 432 p.

The early-middle Eocene was the final episode of warm “greenhouse” climates on Earth, when the climate was warmer from the tropics to the poles (alligators could live above the Arctic Circle). Every study shows that the warm early Eocene and early middle Eocene were the highest periods of diversity in the entire Cenozoic. As the planet cooled during the middle and late Eocene, the diverse, warm-adapted fauna began to decline and die out, culminating in a much lower diversity when...

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