Before revision: This is how a large number of groups of mammals appear at the beginning of the Eocene, about 56 million years ago: Artiodactyls; Perissodactyls; Primates; Hyaenodontidae... Analogies with current global warming Even if the hyperthermal events of the Paleogene appear extremely brutal on the geologic time scale (in a range of a few thousand years for an increase of the order of 5 °C), they remain very significantly longer than the durations envisaged in the current models of global warming of anthropogenic origin.
After revision: This is how a large number of groups of mammals appear at the beginning of the Eocene, about 56 million years ago: Artiodactyls; Perissodactyls; Primates; Hyaenodontidae... Analogies with current global warming Even if the hyperthermal events of the Paleogene appear extremely brutal on the geologic time scale (in a range of a few thousand years for an increase of the order of 5 °C), they remain significantly longer than the durations envisaged in the current models of global warming of anthropogenic origin.