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White River - Big Sand Draw Sandstone Lentil, Fremont County, Wyoming, USA

Formation	White River
Member	Big Sand Draw Sandstone Lentil
Age:	37.2 - 33.9 Ma Paleogene
Interval	Early Chadronian
Number of Collections	2
Number of Occurrences	9

Recorded Sample Locations

Location	Region	Stratigraphic Name
Ledge	Fremont County, Wyoming, USA	White River - Big Sand Draw Sandstone Lentil

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Arikaree	20.4 - 5.33 Ma Miocene	siliciclastic	278
Aycross	50.3 - 46.2 Ma Eocene	sandstone	146
Fort Union - Shotgun	56.8 - 55.8 Ma Paleogene		69
Indian Meadows	55.8 - 50.3 Ma Eocene		23
Lower Variegated Sequence - basal	55.8 - 50.3 Ma Eocene		7
Middle Variegated Sequence	55.8 - 50.3 Ma Eocene		6
Split Rock	16.0 - 5.33 Ma Miocene		11
Tepee Trail - Unit 24	46.2 - 40.4 Ma Eocene		32
Tepee Trail - Unit 30	46.2 - 40.4 Ma Eocene		1
top of Lower Variegated Sequence	55.8 - 50.3 Ma Eocene		3
Upper Variegated Sequence	55.8 - 50.3 Ma Eocene		8
Wagon Bed - Unit 3	50.3 - 46.2 Ma Eocene		3
Wagon Bed - Unit 5	46.2 - 40.4 Ma Eocene		7
Wagon Bed ("Tepee Trail") - Hendry Ranch	46.2 - 40.4 Ma Eocene		4
Wasatch	55.8 - 50.3 Ma Eocene		182
White River	30.8 - 20.4 Ma Cenozoic	mudstone, siltstone, sandstone	329
White River - Beaver Divide Conglomerate	37.2 - 33.9 Ma Paleogene		1
White River - upper	37.2 - 33.3 Ma Paleogene		21
Wiggins	46.2 - 40.4 Ma Eocene		35
Wind River	48.6 - 37.2 Ma Eocene		440
Wind River - Lost Cabin	50.3 - 46.2 Ma Eocene	mudstone	403
Wind River - Lysite	55.8 - 50.3 Ma Eocene		31

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Brachyhyops wyomingensis species	7	Animalia : Chordata : Mammalia : Artiodactyla : Entelodontidae : Brachyhyops : *Brachyhyops wyomingensis*	37.2 - 33.9 Ma Paleogene
Leptomerycidae family	5	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae	37.2 - 33.9 Ma Paleogene
Metamynodon planifrons species	7	Animalia : Chordata : Mammalia : Perissodactyla : Amynodontidae : Metamynodon : *Metamynodon planifrons*	37.2 - 33.9 Ma Paleogene
Brontotheriidae family	5	Animalia : Chordata : Mammalia : Perissodactyla : Brontotheriidae	37.2 - 33.9 Ma Paleogene
Megaceratops heloceras species	7	Animalia : Chordata : Mammalia : Perissodactyla : Brontotheriidae : Symborodon : *Megaceratops heloceras*	37.2 - 33.9 Ma Paleogene
Equidae family	5	Animalia : Chordata : Mammalia : Perissodactyla : Equidae	37.2 - 33.9 Ma Paleogene
Hyracodon priscidens species	7	Animalia : Chordata : Mammalia : Perissodactyla : Hyracodontidae : Hyracodon : *Hyracodon priscidens*	37.2 - 33.9 Ma Paleogene
Subhyracodon sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Rhinocerotidae : *Subhyracodon*	37.2 - 33.9 Ma Paleogene

References

Van Houten F. B. (1964) Tertiary geology of the Beaver Rim area, Fremont and Natrona Counties, Wyoming, United States Geological Survey Bulletin 1164, 1-99

Alroy J. (2002) Synonymies and reidentifications of North American fossil mammals

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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