Cambrian of North America

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

  • F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 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
  • F. M. Gradstein, J. G. Ogg, and A. G. Smith. 2004. A Geologic Time Scale 2004 1-589 view

There are 12 timescales which overlap this one. show

Interval boundaries marked with * have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

Interval names marked with † are no longer in current use.

This timescale is used in the definition of 1828 collections

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International Chronostratigraphic TimescaleCambrian of North AmericaCambrian of AustraliaCambrian of KazakhstanCambrian of West Avalonia
OrdovicianEarly OrdovicianTremadocianUngurian477.7
CambrianFurongianStage 10Franconian †/Dresbachian/MillardanDatsonianBatyrbaian485.4
Payntonian486.8 *
Sunwaptan487.5
JiangshanianIverian489.5
Aksaian490.7 *
Sakian492.2 *
Steptoean493 *
PaibianIdamean494
MiaolingianGuzhangianMarjumianAlbertian †MindyallanAyusokkanian497
Arcadian498.4
Boomerangian499
499.5
DrumianUndillanZhanaarykian500.5
FloranTuesaian503
WuliuanTopazanTempletonian504.5
505.3
Delamaran506.5
Ordian507.8 *
Series 2Stage 4Waucoban †Branchian509
Toyonian510 *
510.8 *
Dyeran511 *
Botomian512.5 *
Stage 3514
Montezuman514.8 *
Atdabanian515.6 *
Placentian517.1
Begadean519.9 *
TerreneuvianStage 2Tommotian521
525.5
Fortunian529
538.8