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The Mesozoic timeline



Period                  Subperiod               Stage            Age (Ma)
                                                         (date for upper 
boundary)
Cretaceous              Late Cretaceous         Maastrichtian   65.0
                                                  Campanian       74.0
                                                  Santonian       83.0
                                                  Coniacian       86.6
                                                  Turonian        88.5
                                                  Cenomanian      90.4
                         Early Cretaceous         Albian         97.0
                                                   Aptian        112.0
                                                  Barremian      124.5
                                                  Hauterivian    131.8
                                                  Valanginian    135.0
                                                  Berriasian     140.7
Jurassic                Late Jurassic            Tithonian       145.6
                                                  Kimmeridgian   152.1
                                                  Oxfordian      154.7
                        Middle Jurassic          Callovian       157.1
                                                  Bathonian       161.3
                                                  Bajocian        166.1
                                                  Aalenian        173.5
                        Early Jurassic            Toarcian        178.0
                                                  Pliensbachian   187.0
                                                  Sinemurian       194.5
                                                  Hettangian       203.5
Triassic                Late Triassic            Rhaetian         208.0
                                                  Norian           209.5
                                                  Carnian          223.4
                        Middle Triassic          Ladinian         235.0
                                                  Anisian          239.5
                        Early Triassic            Spathian        241.1
                                                  Nammalian        241.9
                                                  Griesbachian     243.4

and the Permo-Triassic (=Changxingian-Griesbachian) boundary is at 245.0

Source: A Geologic Time Scale 1989 (Harland et al., 1990, Cambridge Univ.
Press)
                                     
Thomas R. Holtz, Jr.                            tholtz@geochange.er.usgs.gov
Vertebrate Paleontologist in Exile              Phone:          703-648-5280
U.S. Geological Survey                          FAX:            703-648-5420
Branch of Paleontology & Stratigraphy
MS 970 National Center
Reston, VA  22092
U.S.A.