Working Groups

Click on the ages in the timeline below to go to Working Groups or GSSP pages.

Cretaceous
Late
Early
Maastrichtian
66.0
Campanian
72.1
Santonian
83.6
Coniacian
86.3
Turonian
89.8
Cenomanian
93.9
Albian
100
Aptian
113
Barremian
126
Hauterivian
131
Valanginian
134
Berriasian
139
145
Kilian Group