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Time Line (NC)
Period Epoch Stage top of stage date (Ma)
---------------------------------------------------------------------------------------------------
Cretaceous Gulf (K2) Maastrichtian 65
Campanian 74
Santonian 83
Coniacian 86.6
Turonian 88.5
Cenomanian 90.4
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Early Cretaceous Albian 97
(K1) Aptian 112
Barremian 124.5
Hauterivian 131.8
Valanginian 135
Berriasian 140.7
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Jurassic Malm Tithonian 145.6
(J3) Kimmeridgian 152.1
Oxfordian 154.7
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Dogger Callovian 157.1
(J2) Bathonian 161.3
Bajocian 166.1
Aalenian 173.5
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Lias Toarcian 178
(J1) Pliensbachian 187
Sinemurian 194.5
Hettangian 203.5
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Triassic Late Triassic Rhaetian 208
(Tr3) Norian 209.5
Carnian 223.4
----------------------------------------------------------------------------------
Mid Triassic Ladinian 235
(Tr2) Anisian ?239.5
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Scythian Spathian 241.1
(Tr1) Nammalian ?
Griesbachian ?
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Permian 245
Based on Harland et al. 1989 *A Geologic Time Scale* p174-5
Neil Clark
Curator of Palaeontology
Hunterian Museum
University of Glasgow
email: NCLARK@museum.gla.ac.uk
Some large dinosaurs had three horns and were called
triceps, others had two horns and were called biceps.
(Geological Howlers - ed. WDI Rolfe)