User:Alumnum/tests2

The following scale represents the geologic supereons, eons, eras, periods and epochs. The information in parentheses shows how many years ago each of them happened (bi = billions, mi = millions, k = thousand).


 * Precambrian Supereon (previously called Azoic Age, pre-1950)
 * Hadean Eon (4 bi 540 mi — 4 bi)
 * Archean Eon
 * Eoarchean Era (4 bi — 3 bi 600 mi) {abiogenesis — life emerges} {prokaryotes emerge}
 * Palaeoarchean Era (3 bi 600 mi — 3 bi 200 mi) {possible formation of Vaalbara}
 * Mesoarchean Era (3 bi 200 mi — 2 bi 800 mi) {possible formation of Ur}
 * Neoarchean Era (2 bi 800 mi — 2 bi 500 mi)
 * Proterozoic Eon
 * Paleoproterozoic Era (2 bi 500 mi — 1 bi 600 mi) {eukaryotes emerge} {possible Snowball Earth(s)}
 * Mesoproterozoic Era (1 bi 600 mi — 1 bi) {plants emerge}
 * Neoproterozoic Era (1 bi — 541 mi) {animals emerge} {protists emerge} {sponges and cnidarians emerge} {possible Snowball Earth(s)} {possible Pannotia and Rodinia}


 * [Unnamed Supereon]
 * Phanerozoic Eon
 * Paleozoic Era
 * Cambrian Period (541 mi — 485 mi 400 k) {chordates emerge} {molluscs and anthropods emerge} {vertebrates emerge} {fish emerge}
 * Ordovician Period (485 mi 400 k — 443 mi 400 k) {embryophytes emerge} {annelids emerge}
 * Silurian Period (443 mi 400 k — 419 mi 200 k) {early land plants}
 * Devonian Period (419 mi 200 k — 358 mi 900 k) {more abundant land plants} {fungi emerge} {amphibians emerge} {insects emerge}
 * Carboniferous Period {reptiles emerge} {Pangaea is formed}
 * Mississippian Epoch (358 mi 900 k — 323 mi 200 k)
 * Pennsylvanian Epoch (323 mi 200 k — 298 mi 900 k)
 * Permian Period (298 mi 900 k — 252 mi 170 k)
 * Mesozoic Era
 * Triassic Period
 * Lower Triassic Epoch (252 mi 170 k — 247 mi 200 k)
 * Middle Triassic Epoch (247 mi 200 k — 237 mi)
 * Upper Triassic Epoch (237 mi — 201 mi 300 k) {dinosaurs emerge} {early forms of mammals emerge}
 * Jurassic Period
 * Lower Jurassic Epoch (201 mi 300 k — 174 mi 100 k) {Laurasia and Gondwana separate from each other}
 * Middle Jurassic Epoch (174 mi 100 k — 163 mi 500 k) {more familar mammals emerge}
 * Upper Jurassic Epoch (163 mi 500 k — 145 mi)
 * Cretaceous Period
 * Lower Cretaceous Epoch (145 mi — 100 mi 500 k)
 * Upper Cretaceous Epoch (100 mi 500 k — 66 mi) {dinosaurs, except birds, are extinct} {birds emerge}
 * Cenozoic Era
 * Paleogene Period
 * Paleocene Epoch (66 mi — 56 mi)
 * Eocene Epoch (56 mi — 33 mi 900 k) {primate, equids, bears and canids emerge}
 * Oligocene Epoch (33 mi 900 k — 23 mi 30 k) {felids and suids emerge}
 * Neogene Period
 * Miocene Epoch (23 mi 30 k — 5 mi 333 k) {hominids, bovids and felines emerge}
 * Pliocene Epoch (5 mi 333 k — 2 mi 588 k) {elephantids emerge} {early humans emerge}
 * Quaternary Period
 * Pleistocene Epoch (2 mi 588 k — 11 k 700) {modern humans emerge} {last glacial period}
 * Holocene Epoch (11 k 700 — present)