About 5 million years ago
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PLIOCENEAbout 5 million years ago
ICEAGEAbout a million years ago.
STONEAGEIt started about 2 1-2 million years ago
permiannoting or pertaining to a period of the Paleozoic Era occurring from about 280 to 230 million years ago and characterized by a profusion of amphibian species
NEOCENEAGERoughly forty million years ago.
STONEAGECirca 12 million years ago.
EOCENEEpoch 50 million years ago
CAMBRIANTime period, 500 million years ago.
PANGAEASupercontinent of 200 million years ago
EOCENEEpoch of 50 million years ago
PANGAEASupercontinent of 200+ million years ago
EOCENEOccurring 40 to 55 million years ago
PLIOCENEEpoch from 10 to 2 million years ago
PLIOCENEEpoch from two to five million years ago
cenozoicnoting or pertaining to the present era, beginning 65 million years ago and characterized by the ascendancy of mammals
miocenenoting or pertaining to an epoch of the Tertiary Period, occurring from 25 to 10 million years ago, when grazing mammals became widespread
eocenenoting or pertaining to an epoch of the Tertiary Period, occurring from 55 to 40 million years ago and characterized by the advent of the modern mammalian orders
devoniannoting or pertaining to a period of the Paleozoic Era, 405 to 345 million years ago, characterized by the dominance of fishes and the advent of amphibians and ammonites
mesozoicnoting or pertaining to an era occurring between 230 and 65 million years ago, characterized by the appearance of flowering plants and by the appearance and extinction of dinosaurs
siluriannoting or pertaining to a period of the Paleozoic Era, occurring from 425 to 405 million years ago, notable for the advent of air-breathing animals and terrestrial plants
jurassicnoting or pertaining to a period of the Mesozoic Epoch, occurring from 190 to 140 million years ago and characterized by an abundance of dinosaurs and the advent of birds and mammals
pliocenenoting or pertaining to an epoch of the Tertiary Period, occurring from 10 to 2 million years ago, and characterized by increased size and numbers of mammals, by the growth of mountains, and by global climatic cooling
paleogenenoting or pertaining to the earlier part of the Cenozoic Era, in the system adopted by some geologists, occurring from 65 to 25 million years ago and including the Oligocene, Eocene, and Paleocene epochs: corresponds to the earlier part of the Tertiary Pe