ammonites

Gradstein Cambro-Ordovician Stages of Laurentia

Authorizer: J. Alroy   Enterer: J. Alroy

Continent: North America   Rank of each interval: age/stage

Basis of scale: paleontological  

Reference: F. M. Gradstein et al. 2004

Comments: Ordovician stages run only through the early Middle Ordovician; see also Late Cambrian of North America scale

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