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
  • M. Kretzoi. 1942. Necroteuthis n. g. (Ceph. Dibr., Necroteuthidae N. F.) aus dem Oligozän von Budapest und das system der Dibranchiata. Földtani Közlöny 72:125-238 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 1827 collections

Show more time

Show linear time

International Chronostratigraphic TimescaleCambrian of North AmericaOrdovician of North AmericaCambrian of AustraliaCambrian of ChinaCambrian of West AvaloniaCambrian Epochs
OrdovicianLate OrdovicianHirnantianCincinnatianGamachian443.8
Katian445.2
Richmondian446 *
MaysvillianRocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian449.8 *
Edenian450.4 *
MohawkianChatfieldian451.1 *
Sandbian453
Turinian453.7 *
WhiterockianCanadian †Chazyan †/Marmor457 *
Middle OrdovicianDarriwilian458.4
Dapingian467.3
Rangerian469.1 *
Early OrdovicianFloianIbexianBlackhillsianJeffersonian †Cassinian †470
Tulean473.9 *
Tremadocian477.7
Stairsian480.3 *
SkullrockianDemingian †482 *
CambrianFurongianStage 10Franconian †/Dresbachian/MillardanDatsonianNiucheheanTaoyuanian †Late Cambrian485.4
Payntonian486.8 *
Sunwaptan487.5
JiangshanianIverianJiangshanian489.5
Steptoean493 *
PaibianIdameanPaibian494
Waergangian †/Youshuanian494.9 *
MiaolingianGuzhangianMarjumianAlbertian †MindyallanGuzhangianWangcunian †Middle Cambrian497
Arcadian498.4
Boomerangian499
DrumianUndillanDrumian500.5
Floran503
WuliuanTopazanTempletonianWuliuan/Taijangian504.5
Delamaran506.5
Ordian507.8 *
Series 2Stage 4Waucoban †DuyunianBranchianEarly Cambrian509
510.8 *
Dyeran511 *
Stage 3Nangaoian514
Montezuman514.8 *
Placentian517.1
Begadean519.9 *
TerreneuvianStage 2Meishucunian521
Fortunian529
Jinnigian530.7
538.8