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 {{Mya|55.4-50.3|million years}}.[https://paleodb.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=231 Paleobiology Database, Wasatchian]

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.

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

class="wikitable" style="font-size: 60%"

|+ Wasatchian correlations in North America

Formation{{big|Wasatch}}DeBequeClaronIndian MeadowsPass PeakTatmanWillwoodGolden ValleyColdwaterAllenbyKamloopsOotsa LakeMargaretNanjemoyHatchetigbeeTetas de CabraHannold HillCoalmontCucharaGalisteoSan JoseYpresian (IUCS) • Itaboraian (SALMA)
Bumbanian (ALMA) • Mangaorapan (NZ)
BasinPowder River
Uinta
Piceance
Colorado Plateau
Wind River
Green River
Bighorn
Piceance




Colorado Plateau





Wind River





Green River
colspan=2 |





Bighorn
WillistonOkanaganPrincetonBuck CreekNechakoSverdrupPotomacGoMLaguna SaladaRio GrandeNorth ParkRatonGalisteoSan Juanalign=center rowspan=14 | {{Location map+ | North America

| relief = 1

| width = 220

| float = center

| places =

{{Location map~ | North America

| lat_deg = 50.1

| lon_deg = -120.5

| mark = Pink ff0080 pog.svg

| marksize = 10

| link = Coldwater Beds

}}

{{Location map~ | North America

| lat_deg = 78.7

| lon_deg = -81.9

| mark = Pink ff0080 pog.svg

| marksize = 10

| link = Margaret Formation

}}

{{Location map~ | North America

| lat_deg = 50.8

| lon_deg = -121.1

| mark = Pink ff0080 pog.svg

| marksize = 10

| link = Kamloops Group

}}

{{Location map~ | North America

| lat_deg = 35.4

| lon_deg = -106.0

| mark = Pink ff0080 pog.svg

| marksize = 10

| link = Galisteo Formation

}}

{{Location map~ | North America

| lat_deg = 44.2

| lon_deg = -108.6

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Tatman Formation

}}

{{Location map~ | North America

| lat_deg = 44.5

| lon_deg = -108.0

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Willwood Formation

}}

{{Location map~ | North America

| lat_deg = 48.5

| lon_deg = -102.7

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Golden Valley Formation

}}

{{Location map~ | North America

| lat_deg = 38.8

| lon_deg = -76.7

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Nanjemoy Formation

}}

{{Location map~ | North America

| lat_deg = 28.7

| lon_deg = -114.1

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Las Tetas de Cabra Formation

}}

{{Location map~ | North America

| lat_deg = 40.4

| lon_deg = -106.5

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Coalmont Formation

}}

{{Location map~ | North America

| lat_deg = 49.376667

| lon_deg = -120.546667

| mark = Dark Green 004040 pog.svg

| marksize = 10

| link = Allenby Formation

}}

{{Location map~ | North America

| lat_deg = 40.0

| lon_deg = -107.9

| mark = Orange pog.svg

| marksize = 10

| link = DeBeque Formation

}}

{{Location map~ | North America

| lat_deg = 37.8

| lon_deg = -112.0

| mark = Orange pog.svg

| marksize = 10

| link = Claron Formation

}}

{{Location map~ | North America

| lat_deg = 43.2

| lon_deg = -108.2

| mark = Orange pog.svg

| marksize = 10

| link = Indian Meadows Formation

}}

{{Location map~ | North America

| lat_deg = 42.7

| lon_deg = -110.1

| mark = Orange pog.svg

| marksize = 10

| link = Pass Peak Formation

}}

{{Location map~ | North America

| lat_deg = 31.3

| lon_deg = -86.1

| mark = Orange pog.svg

| marksize = 10

| link = Hatchetigbee Bluff Formation

}}

{{Location map~ | North America

| lat_deg = 29.4

| lon_deg = -103.1

| mark = Orange pog.svg

| marksize = 10

| link = Hannold Hill Formation

}}

{{Location map~ | North America

| lat_deg = 37.8

| lon_deg = -105.1

| mark = Orange pog.svg

| marksize = 10

| link = Cuchara Formation

}}

{{Location map~ | North America

| lat_deg = 36.5

| lon_deg = -107.1

| mark = Orange pog.svg

| marksize = 10

| link = San Jose Formation

}}

{{Location map~ | North America

| lat_deg = 54.8

| lon_deg = -127.0

| mark = Orange pog.svg

| marksize = 10

| link = Ootsa Lake Group

}}

{{Location map~ | North America

| lat_deg = 41.9

| lon_deg = -111.0

| mark = Pink ff0080 pog.svg

| marksize = 12

| link = Wasatch Formation

}}

}}

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EnvironmentsAlluvial-fluvio-lacustrineFluvialFluvialFluvio-lacustrineFluvialcolspan=2 | Lacustrinecolspan=2 | Fluvio-lacustrineDeltaic-paludalcolspan=2 | Shallow marineFluvialShallow marineFluvialcolspan=2 | Fluvialrowspan=2 align=left | {{left|8px Wasatchian volcanoclastics}}
{{left|8px Wasatchian fauna}}
{{left|8px Wasatchian flora}}
VolcanicYescolspan=7 | NoYesNoYesNoYescolspan=6 | NoYesNo

References