Thursday 25 April 2013
Geochronology
This is going to be a simple post for this week. Just an outline of the time periods, their names, ages and subdivisions. I hope to expand on this later but this will serve as an initial reference guide. All information is taken from the GeoWhen Database.
MYA = Million Years Ago, TYA = Thousand Years Ago
4567 MYA - Hadean
3800 MYA - Archean - Eoarchean
3600 MYA - - Paleoarchean
3200 MYA - - Mesoarchean
2800 MYA - - Neoarchean
2500 MYA - Proterozoic - Paleoproterozoic - Siderian
2300 MYA - - - Rhyacian
2050 MYA - - - Orosirian
1800 MYA - - - Statherian
1600 MYA - - Mesoproterozoic - Calymmian
1400 MYA - - - Ectasian
1200 MYA - - - Stenian
1000 MYA - - Neoproterozoic - Tonian
850 MYA - - - Cryogenian
630 MYA - - - Ediacaran
542 MYA - Phanerozoic - Paleozoic - Cambrian - Early Cambrian
513 MYA - - - - Middle Cambrian
501 MYA - - - - Late Cambrian
488 MYA - - - Ordovician - Early Ordovician - Tremadocian
478 MYA - - - - - Arenig
471 MYA - - - - Middle Ordovician - Ordovician III (No official name)
468 MYA - - - - - Darriwilian
460 MYA - - - - Late Ordovician - Ordovician V (No official name)
455 MYA - - - - - Ordovician VI (No official name)
445 MYA - - - - - Hirnantian
443 MYA - - - Silurian - Early Silurian - Llandovery - Rhuddanian
439 MYA - - - - - - Aeronian
436 MYA - - - - - - Telychian
428 MYA - - - - - Wenlock - Sheinwoodian
426 MYA - - - - - - Homerian
422 MYA - - - - Late Silurian - Ludlow - Gorstian
421 MYA - - - - - - Ludfordian
418 MYA - - - - - Pridoli
416 MYA - - - Devonian - Early Devonian - Lochkovian
411 MYA - - - - - Praghian
407 MYA - - - - - Emsian
397 MYA - - - - Middle Devonian - Eifelian
391 MYA - - - - - Givetian
385 MYA - - - - Late Devonian - Frasnian
374 MYA - - - - - Famennian
359 MYA - - - Carboniferous - Mississipian - Early Mississipian
345 MYA - - - - - Middle Mississipian
326 MYA - - - - - Late Mississipian
318 MYA - - - - Pennsylvanian - Early Pennsylvanian
311 MYA - - - - - Middle Pennsylvanian
306 MYA - - - - - Late Pennsylvanian - Kasimovian
303 MYA - - - - - - Gzhelian
299 MYA - - - Permian - Early Permian - Asselian
294 MYA - - - - - Sakmarian
284 MYA - - - - - Artinskian
275 MYA - - - - - Kungurian
270 MYA - - - - Middle Permian - Roadian
268 MYA - - - - - Wordian
265 MYA - - - - - Capitanian
260 MYA - - - - Late Permian - Wuchiapingian
253 MYA - - - - - Changhsingian
251 MYA - - Mesozoic - Triassic - Early Triassic - Induan
249 MYA - - - - - Olenekian
245 MYA - - - - Middle Triassic - Anisian
237 MYA - - - - - Ladinian
228 MYA - - - - Late Triassic - Carnian
216 MYA - - - - - Norian
203 MYA - - - - - Rhaetian
199 MYA - - - Jurassic - Early Jurrasic - Hettangian
196 MYA - - - - - Sinemurian
189 MYA - - - - - Pliensbachian
183 MYA - - - - - Toarcian
175 MYA - - - - Middle Jurassic - Aalenian
171 MYA - - - - - Bajocian
167 MYA - - - - - Bathonian
164 MYA - - - - - Callovian
161 MYA - - - - Late Jurassic - Oxfordian
155 MYA - - - - - Kimmeridgian
150 MYA - - - - - Tithonian
145 MYA - - - Cretaceous - Early Cretaceous - Berriasian
140 MYA - - - - - Valanginian
136 MYA - - - - - Hauterivian
130 MYA - - - - - Barremian
125 MYA - - - - - Aptian
112 MYA - - - - - Albian
99 MYA - - - - Late Cretaceous - Cenomanian
93 MYA - - - - - Turonian
89 MYA - - - - - Coniacian
85 MYA - - - - - Santonian
83 MYA - - - - - Campanian
70 MYA - - - - - Maastrichtian
65 MYA - - Cenozoic - Paleogene - Paleocene - Early Paleocene
61 MYA - - - - - Middle Paleocene
58 MYA - - - - - Late Paleocene
55 MYA - - - - Eocene - Early Eocene
48 MYA - - - - - Middle Eocene - Lutetian
40 MYA - - - - - - Bartonian
37 MYA - - - - - Late Eocene
33 MYA - - - - Oligocene - Early Oligocene
28 MYA - - - - - Late Oligocene
23 MYA - - - Neogene - Miocene - Early Miocene - Aquitanian
20 MYA - - - - - - Burdigalian
15 MYA - - - - - Middle Miocene - Langhian
13 MYA - - - - - - Serravallian
11 MYA - - - - - Late Miocene - Tortonian
7 MYA - - - - - - Messinian
5 MYA - - - - Pliocene - Early Pliocene
3 MYA - - - - - Late Pliocene - Piacenzian
2 MYA - - - - - - Gelasian
1 MYA - - - - Pleistocene - Early Pleistocene
781 TYA - - - - - Middle Pleistocene
126 TYA - - - - - Late Pleistocene
11 TYA - - - - Holocene
That's it. Hopefully, it will serve its purpose well. My next blog post on time periods will cover the Story of Life from the start to the Arrival of the Dinosaurs in the Late Triassic. But that won't be for a while yet. Next week will be an in-depth look into the movie that shaped my life, Jurassic Park. How much of it is science-fact and how much is science-fiction? Tune in next week to find out.
See also:
More dinosaurs
Life before the dinosaurs
Age of the Dinosaurs
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