Most of the evidence of life forms in this epoch are derived from the study of terrestrial rock deposits, as marine rocks from this period are relatively rare. The Paleocene Epoch spans the interval between 66 million and 56 million years ago. Those events saw the fall of reptilian dinosaurs and many of the other species that had dominated life on Earth in the Creataceous Period. Below, we look at the eight epochs to have occurred since the Late Cretaceous Extinction events. Multiple Epochs constitute Periods, which in turn constitute Eras, which in turn constitute Eons.
In the geological time scale, Epochs are periods of measurement.
