Wasatchian

Short description: North American faunal stage

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.

## Contents

* 1 Definition
* 2 Substages
* 3 Wasatchian correlations
* 4 References

## Definition

The age is named after the Wasatch Formation, a highly fossiliferous stratigraphic unit stretching across six of the United States from Idaho and Montana in the north through Utah and Wyoming to Colorado and New Mexico in the south.

## 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.

## Wasatchian correlations

Wasatchian correlations in North America Basin | Powder River
Uinta
Piceance
Colorado Plateau
Wind River
Green River
Bighorn | Piceance

Colorado Plateau

Wind River

Green River

Bighorn | Williston | Okanagan | Princeton | Buck Creek | Nechako | Sverdrup | Potomac | GoM | Laguna Salada | Rio Grande | North Park | Raton | Galisteo | San Juan |

Wasatchian (North America)

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Country |  United States |  Canada |  United States |  Mexico |  United States
Copelemur | 14px | 14px |  |  |  |  | 14px |  |  |  |  |  |  |  |  |  |  |  |  |  | 14px
Coryphodon | 14px | 14px |  | 14px |  |  | 14px | 14px |  |  |  |  | 14px |  | 14px |  | 14px |  |  | 14px | 14px
Diacodexis | 14px | 14px |  |  | 14px |  | 14px | 14px |  |  |  |  |  |  |  | 14px |  |  |  |  | 14px
Homogalax | 14px | 14px |  | 14px |  |  | 14px | 14px |  |  |  |  |  | 14px |  |  |  |  |  | 14px |
Oxyaena | 14px | 14px |  |  |  |  | 14px |  |  |  |  |  |  |  |  | 14px |  |  |  |  | 14px
Paramys | 14px | 14px |  | 14px | 14px |  | 14px | 14px |  |  |  |  | 14px |  |  |  | 14px |  |  |  | 14px
Primates | 10px |  |  | 10px |  |  | 10px |  |  |  |  |  | 10px |  |  |  | 10px |  |  | 10px | 10px
Birds | 10px |  |  |  |  |  |  |  | 10px | 10px |  |  | 10px | 10px |  |  |  |  |  |  |
Reptiles | 10px |  | 10px |  |  |  |  | 10px |  |  |  |  | 10px | 10px |  | 10px |  |  |  |  | 10px
Fish | 10px |  | 10px |  |  |  |  | 10px |  | 10px |  |  | 10px | 10px |  | 10px |  |  |  |  |
Insects |  |  |  |  |  |  |  | 10px | 10px | 10px | 10px | 10px |  |  |  |  |  | 10px |  |  |
Flora | 10px |  |  |  |  | 10px | 10px | 10px | 10px | 10px |  |  |  | 10px |  | 10px |  | 10px |  |  |
Environments | Alluvial-fluvio-lacustrine | Fluvial |  |  |  | Fluvial | Fluvio-lacustrine | Fluvial | Lacustrine | Fluvio-lacustrine | Deltaic-paludal | Shallow marine | Fluvial | Shallow marine | Fluvial |  | Fluvial |

Wasatchian volcanoclastics

8px Wasatchian fauna

Wasatchian flora

Volcanic | Yes | No | Yes | No | Yes | No | Yes | No | Yes | No

## References

1. ↑ Paleobiology Database, Wasatchian

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