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

• 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
• 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

There are 5 timescales which overlap this one. show

• Obsolete Names for ICS Units
• Ten Million Year Bins
• Mesozoic Subages
• Cretaceous North American Land-Mammal Ages
• Cretaceous-Cenozoic of New Zealand

This timescale is used in the definition of 232 collections