Geological Timescale


 Era

Period

Epoch

Age

 Cenozoic

 Neogene
 Holocene  0.0114
 Pleistocene  1.8
 Pliocene  5.3
 Miocene  23

 Palaeogene
 Oligocene  33.9
 Eocene  55.8
 Palaeocene  65.5

Mesozoic

   Cretaceous
 Upper  99.6
 Lower 145.5

Jurassic
 Upper  161.2
 Middle  175.6
 Lower  199.6

   Triassic
 Upper  228
 Middle  245
 Lower  251

Palaeozoic

Permian
 Lopingian  260.4
 Guadalupian  270.6
 Cisuralian  299

Carboniferous
 Upper  306.5
 Middle  311.7
 Lower  359.2

Devonian
 Upper  385.3
 Middle  397.5
 Lower  416

Silurian
 Pridoli  418.7
 Ludlow  422.9
 Wenlock  428.2
 Llandovery  443.7

Ordovician
 Upper  460.9
 Middle  471.8
 Lower  488.3

Cambrian
 Upper  501
 Middle  513
 Lower  542

Proterozoic
 Neoproterozoic  Ediacaran  630
 Cryogenian  850
 Tonian  1000
 Mesoproterozoic  Stenian  1200
 Ectasian  1400
 Calymmian  1600
 Palaeoproterozoic  Statherian  1800
 Orosirian  2050
 Rhyacian  2300
 Siderian  2500

Archaean
 Neoarchaean    2800
 Mesoarchaean    3200
 Palaeoarchaean    3600
 Eoarchaean    3800

Hadean
 Lower Imbrian    c.3850
 Nectarian    c.3920
 Basin Groups    c.4150
 Cryptic    c.4570

 



Author: Sarah Vinnell
Last updated: 21/11/05
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Websites produced by students on the MSc Palaeobiology programme in the Department of Earth Sciences at the University of Bristol for academic year 2005-6Class Trilobita: Order Phacopida: Fossil Groups: SciComms 05-06: Earth Sciences