Wasatchian




The Wasatchian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 55,400,000 to 50,300,000 years BP lasting 5.1 million years.[1]


It is usually considered to be within the Eocene, more specifically the Early Eocene.


The Wasatchian is preceded by the Clarkforkian and followed by the Bridgerian NALMA stages.



Substages


The Wasatchian is considered to contain the following substages:




  • Sandcouleean: shares lower boundary with the beginning of the Wasatchian age and shares upper boundary with the base of the Graybullian.


  • Graybullian: shares lower boundary with the end of the Sandcouleean subage and upper boundary with the base of the Lysitean.


  • Lysitean: shares lower boundary with the end of the Graybullian subage and upper boundary with the base of the Lostcabinian.


  • Lostcabinian: shares lower boundary with the end of the Lysitean subage and upper boundary with the beginning of the Bridgerian.





References





  1. ^ Paleobiology Database, Wasatchian












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