Understanding ancient ocean temperatures—particularly from the Cenozoic era (the past 66 million years), in which Earth ...

During the Oligocene epoch about 33.9 to 23 million years ago, most mammals remained small, but one giant, Paraceratherium, ...

3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs ... dominated the land, and had taken to the air. The cooling and drying trend began in earnest following ...