Very large things often have small beginnings. That certainly was true for brontotheres, the enormous, rhino-like herbivorous mammals that lumbered across North America and Asia during the Eocene ...
Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, No. 17 (April 26, 2022), pp. 1-9 (9 pages) The Eocene–Oligocene Transition (∼33.9 Ma) marks the largest step ...
Toward the end of the Eocene epoch 35 million years ago, temperatures plummeted and the Earth’s primitive inhabitants endured a cold spell that lasted 100,000 years. The length of that ordeal and what ...
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