The interval definitions in this timescale are derived from the following sources:

• J. A. Lillegraven and M. C. McKenna. 1986. Fossil mammals from the "Mesaverde" Formation (Late Cretaceous, Judithian) of the Bighorn and Wind River basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal "Ages". American Museum Novitates 2840:1-68 view
• W. B. Harland, R. L. Armstrong, A. V. Cox, L. E. Craig, A. G. Smith and D. G. Smith. 1990. A Geologic Time Scale 1989. view

There are 5 timescales which overlap this one. show

• Obsolete Names for ICS Units
• Ten Million Year Bins
• Mesozoic Subages
• Cretaceous Subepochs
• Cretaceous-Cenozoic of New Zealand

This timescale is used in the definition of 508 collections