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EARTH SCIENCE

Platte Canyon High School
Bailey, Colorado

Time Scale

GEOLOGIC TIME SCALE

Cretaceous

after Harland et al., 1982

  =========================================================
Period Epoch Age Ma age Comments
      65  
Cretaceous Senonian
K2
Maastrichtian 73  
Campanian 83  
Santonian 87.5  
Coniacian 88.5  
K2 / K1 Turonian 91  
Cenomanian 97.5  
Albian 113  
Aptian 119  
Barrenian 125  
Neocomian
K1
Hauterivian 131  
Valanginian 138  
Berriasian 144  
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