Geological Time Scale


 * Precambrian era
 * Azoic era
 * Archeozoic ear
 * Proterozoic era
 * Paleozoic era
 * Cambrian period
 * Ordovician period
 * Silurian period
 * Devonian period
 * Carboniferous period
 * Mississippian period
 * Pennsylvanian period
 * Permian period
 * Mesozoic era
 * Triassic period
 * Jurassic period
 * Cretaceous period
 * Cenozoic era
 * Tertiary period
 * Paleocene epoch
 * Eocene epoch
 * Oligocene epoch
 * Miocene epoch
 * Pliocene epoch
 * Quaternary period
 * Pleistocene epoch
 * Holocene epoch