Bridger Formation
Bridger Formation | |
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Stratigraphic range: Bridgerian - Uintan | |
Type | Formation |
Underlies | Bishop Conglomerate |
Overlies | Green River Formation |
Thickness | 215 feet (66 m) - 270 feet (82 m) |
Location | |
Region | Wyoming |
Country | United States |
Type section | |
Named for | Bridger Wilderness |
Named by | F.V. Hayden |
The Bridger Formation is a geologic formation in southwestern Wyoming. It preserves fossils dating back to the Bridgerian and Uintan stages of the Paleogene Period. The formation was named by American geologist Ferdinand Vandeveer Hayden for Fort Bridger, which had itself been named for mountain man Jim Bridger. The Bridger Wilderness covers much of the Bridger Formation's area.
History
Before colonization, the lands making up the Bridger Formation had been inhabited by the Apsáalooke, Bannock, Eastern Shoshone, Hinono'eino, Očhéthi Šakówiŋ, Só'taeo'o, Tsétsêhéstâhese, and Ute nations. European settlers began to settle the area around the Bridger Formation in the 19th century, beginning with the establishment of the Oregon Trail in 1830. Fort Bridger – for which the formation would later be named – was established in 1843 by Jim Bridger and Louis Vasquez. In 1868, the remaining Indigenous communities in the area were displaced by the Treaty of Fort Bridger, removing them to the Fort Hall Indian Reservation and Wind River Indian Reservation.
The first documented fossils to be recovered from the Bridger Formation were discovered on 11 August 1849 by Captain Howard Stansbury, who documented the discovery of fossilized shells and wood in his expedition report while scouting out the region for the United States Army Corps of Topographical Engineers. In the early-1860s, trapper Jack Robinson claimed to have discovered a number of sites along the base of the Uinta Mountains where grizzly bears had been turned to stone. When these claims were called into question by judge William A. Carter, Robinson brought Carter a bag filled with the fossils. One of the specimens recovered by Robinson was a well-preserved skull which resembled that of a grizzly bear. Judger Carter invited Louis Agassiz to observe the local strata, but Agassiz declined as the journey would have involved riding horseback to the site, a mode of transportation Agassiz abhorred. Carter's son-in-law, Dr. J. Van A. Carter, would go on to send a number of fossils to palaeontologist Joseph Leidy at the University of Pennsylvania in 1869. These fossils included the first Bridgerian fossil taxa, Omomys carteri; and the skull discovered by Robinson, which was described as Palaeosyops paludosus. Another researcher responsible for sending off specimens was Dr. Joseph K. Corson, a close friend of Leidy's who hosted him and his family on two three to Fort Bridger in 1872, 1873, and 1879.
The Bridger Formation was described and named in 1869 by H.V. Hayden while conducting a geological survey in the region on behalf of the United States Geological and Geographical Survey of the Territories. The famously fossiliferous Bridger Formation attracted a number of famed palaeontologists including Henry Fairfield Osborn, William Berryman Scott, and F. Speir, Jr. The Bridger Formation also became a battleground in the Bone Wars between Edward Drinker Cope and Othniel Charles Marsh.
The Bridger Formation did not see a proper scientific mission until 1903, when Walter W. Granger and William Diller Matthew initiated a three-year survey of the strata, during which time Matthew identified the Bridger Formation's distinct members by using local limestone layers as marker beds. Later expeditions brought other researchers to the region, including Charles Lewis Gazin.
Geology
The Bridger Formation overlies the Green River Formation and underlies the Bishop Conglomerate. The boundary with the former occurs in the mid-Eocene after the region completed a transition to a drier environment from a moist climate in the early Eocene. Limestone deposits like the Sage Creek Formation separate the three distinct members which make up the Bridger Formation: Blacks Fork (Bridger B), Twin Buttes (Bridger C & D), and Turtle Bluff (Bridger E). The limestone surrounding the Bridger Formation was deposited on the beds of lakes and ponds at the site during the Eocene. William Diller Matthew used this limestone as marker beds in his initial description of the Bridger Formation in 1909.
Portions formerly considered to be part of the Bridger Formation have since been reassigned to the nearby Uinta Formation.
Palaeobiology
Dozens of Early Eocene (50.3 - 46.2 Ma) mammalian and invertebrate genera are known from the Bridger Formation.
Eutherians
Artiodactyls
Achaenodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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A. insolens |
Wyoming |
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A. robustus |
Wyoming |
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Helohyus |
H. lentus |
Sweetwater County, Wyoming | |||
H. milleri |
Sweetwater County, Wyoming | Bridger B & C | |||
H. plicodon |
southwestern Wyoming | Bridger B & C | |||
Parahyus |
P. vagus |
Wyoming |
|
Homacodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
Antiacodon |
A. pygmaeus |
southwestern Wyoming | Bridger C & D | ||
A. venustus |
Sweetwater County, Wyoming | Bridger D |
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Homacodon |
H. vagans |
southwestern Wyoming | Bridger C & D |
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Microsus |
M. cuspidatus |
southwestern Wyoming | Bridger B - D |
Carnivoramorphans
stem Carnivoramophans
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
O. herpestoides |
Uinta County, Wyoming |
|
Miacidae
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
Harpalodon |
H. sylvestris |
Washakie County, Wyoming | |||
M. bathygnathus |
Henry's Fork Hill, Sweetwater County, Wyoming | Bridger C | |||
M. edax |
Wyoming | ||||
M. parvivorus |
Lincoln and Uinta Counties, Wyoming | Bridger B & C | |||
M. vorax |
Wyoming | ||||
M. vulpinus |
Wyoming | ||||
M. major |
Blue Point Marker, Park County, Wyoming | ||||
U. jugulans |
Henry's Fork Hill, Sweetwater County, Wyoming | Bridger C | |||
V. ovatus |
Little Dry Creek, Uinta County, Wyoming | ||||
V. profectus |
Uinta County, Wyoming |
Viverravidae
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
V. nitidus |
Wyoming |
Carnivorans
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
P. meadi |
Twin Buttes, Sweetwater Counties, Wyoming |
Cimolestans
Apatemyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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A. bellus |
central and southern Wyoming | Bridger C |
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A. bellulus |
southwestern and central Wyoming | Bridger C |
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Esthonychidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Megalesthonyx |
M. hopsoni |
Wyoming | |||
Tillodon |
T. fodiens |
Millersville, Uinta County, Wyoming | |||
T. castoridens |
southwestern Wyoming | ||||
T. gazini |
Uinta County, Wyoming |
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T. hyracoides |
Granger Station, Sweetwater County, Wyoming | ||||
T. latidens |
Lincoln and Sweetwater counties, Wyoming | ||||
T. vetulus |
Lincoln and Sweetwater counties, Wyoming |
Pantolestidae
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
Pantolestes |
P. elegans |
Wyoming | |||
P. intermedius |
Wyoming | ||||
P. longieundus |
Wyoming | ||||
P. natans |
Wyoming | ||||
P. phocipes |
Wyoming |
Creodontans
Hyaenodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
---|---|---|---|---|---|
Didelphodus |
D. altidens |
southwestern Wyoming | |||
Entemodon |
E. comptus |
Honeycomb Buttes, Fremont County, Wyoming | |||
Iridodon |
I. datzae |
Cathedral Bluffs, Sweetwater County, Wyoming |
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L. cuspidens |
Ice Castle, Uinta County, Wyoming |
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L. medius |
Henry's Fork Hill, Uinta County, Wyoming | Bridger D | |||
L. velox |
southwestern Wyoming | ||||
L. verus |
Uinta County, Wyoming | Bridger C | |||
P. antiquus |
Sweetwater County, Wyoming | ||||
P. americana |
Wyoming | ||||
S. aculeatus |
Wyoming | ||||
S. agilis |
Uinta County, Wyoming | ||||
S. eximia |
Wyoming | ||||
S. grangeri |
Cottonwood Creek, Sublette County, Wyoming | ||||
S. insectivorus |
Cottonwood Creek, Sublette County, Wyoming | ||||
S. major |
southwestern Wyoming | ||||
S. minor |
Church Buttes, Uinta County, Wyoming | ||||
S. pungens |
Cottonwood Creek, Sublette County, Wyoming | ||||
S. rapax |
southwestern Wyoming | ||||
T. hians |
Wyoming | ||||
T. strenuus |
Davis Ranch, Johnson County, Wyoming |
Oxyaenidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Aelurotherium |
A. bicuspis |
Henry's Fork, Uinta County, Wyoming | |||
A. latidens |
Grizzly Butte, Uinta County, Wyoming | ||||
M. eothen |
Twin Buttes, Sweetwater County, Wyoming | ||||
M. simpsoni |
Davis Ranch, Johnson County, Wyoming | ||||
P. ferox |
central and southwestern Wyoming | ||||
P. ulta |
southwestern Wyoming |
Dinoceratans
Genus | Species | Location | Stratigraphic position | Material | Images |
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B. fissidens |
southwestern Wyoming | ||||
E. cornutus |
southwestern Wyoming | ||||
U. anceps |
southwestern Wyoming |
Eulipotyphlans
Erinaceomorpha
Genus | Species | Location | Stratigraphic position | Material | Images |
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Talpavus |
T. nitidus |
southwestern Wyoming | Bridger C |
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Geolabididae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Centetodon |
C. bacchanalis |
Hyopsodus Hill, Sublette County, Wyoming | |||
C. bembicophagus |
southwestern Wyoming | ||||
C. pulcher |
southwestern Wyoming | Bridger C & D | |||
Marsholestes |
M. dasypelix |
Uinta County, Wyoming |
Nyctitheriidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Nyctilestes |
N. serotinus |
Uinta County, Wyoming | |||
Nyctitherium |
N. gunnelli |
Uinta County, Wyoming |
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N. priscus |
Wyoming | ||||
N. serotinum |
central and southwestern Wyoming | ||||
N. velox |
Hyopsodus Hill, Sublette County, Wyoming |
Leptictidans
Genus | Species | Location | Stratigraphic position | Material | Images |
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Hypictops |
H. syntaphus |
Uinta County, Wyoming | Bridger D | ||
Palaeictops |
P. bridgeri |
central Wyoming |
Macroscelids
Genus | Species | Location | Stratigraphic position | Material | Images |
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Scenopagus |
S. curtidens |
western Wyoming | |||
S. edenensis |
southwestern Wyoming | ||||
S. priscus |
western Wyoming |
Mesonychids
Genus | Species | Location | Stratigraphic position | Material | Images |
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H. immanis |
southern Wyoming |
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H. macrocephalus |
Lincoln and Uinta counties, Wyoming | ||||
H. lanius |
Wyoming | ||||
H. obtusidens |
Uinta County, Wyoming | ||||
S. canius |
Bitter Creek, Sweetwater County, Wyoming |
Perissodactyls
Amynodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Orthocynodon |
O. antiquus |
Wyoming |
Brontotheriidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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E. borealis |
central Wyoming | ||||
P. fontinalis |
western Wyoming | ||||
P. paludosus |
central & southwestern Wyoming | ||||
P. robustus |
southwestern Wyoming | ||||
P. ultimus |
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T. validum |
Duncan Ranch, Fremont County, Wyoming | Bridger D | |||
T. validus |
Sweetwater County, Wyoming | Bridger D |
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M. megarhinus |
Duncan Ranch, Fremont County, Wyoming |
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Equidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Oligotomus |
O. cinctus |
Wyoming | |||
O. agilis |
Wyoming |
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O. ballardi |
Wyoming |
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O. major |
Millersville, Uinta County, Wyoming |
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O. osbornianus |
Blacks Fork, Uinta County, Wyoming | ||||
O. procyoninus |
Wyoming | ||||
O. progressus |
Wyoming |
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O. pumilus |
southwestern Wyoming | ||||
O. sylvaticus |
Uinta County, Wyoming | ||||
O. uintanus |
Wyoming |
Hyopsodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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H. minusculus |
southern and central Wyoming | Bridger B | |||
H. lepidus |
southwestern Wyoming | Bridger C | |||
H. paulus |
southwestern Wyoming | Bridger B - D | |||
H. pygmaeus |
Wyoming | ||||
H. tonski |
north and central Wyoming |
Hyrachyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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H. eximius |
southwestern Wyoming | ||||
H. minor |
southwestern Wyoming | ||||
H. paradoxus |
Wyoming |
Hyracodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Triplopus |
T. cubitalis |
Wyoming | |||
T. obliquidens |
Wyoming |
Isectolophidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Isectolophus |
I. latidens |
Lone Tree, Uinta County, Wyoming | Bridger D |
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I. radinskyi |
Lone Spring, Uinta County, Wyoming | Bridger D |
Tapiroidea
Genus | Species | Location | Stratigraphic position | Material | Images |
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H. nanus |
central & southwestern Wyoming |
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Palaeanodonta
Genus | Species | Location | Stratigraphic position | Material | Images |
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Brachianodon |
B. westorum |
southwestern Wyoming | |||
M. marshi |
southwestern Wyoming | Bridger C |
Pholidotans
Genus | Species | Location | Stratigraphic position | Material | Images |
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Tetrapassalus |
T. proius |
southwestern Wyoming |
Plesiadapiformes
Genus | Species | Location | Stratigraphic position | Material | Images |
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Alveojunctus |
A. minutus |
Vass Quarry, Hot Springs County, Wyoming |
Primates
Microsyopidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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M. angustidens |
Blackrock Meadows, Teton County, Wyoming | ||||
M. annectens |
Sublette County, Wyoming | ||||
M. elegans |
southwestern Wyoming |
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M. knightensis |
Honeycomb Buttes, Sweetwater County, Wyoming |
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M. scottianus |
southern Wyoming |
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U. parvulus |
southwestern Wyoming | Bridger D |
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Notharctidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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N. robinsoni |
southwestern Wyoming |
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N. robustior |
southwestern Wyoming | Bridger C & D |
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southwestern Wyoming | |||||
N. venticolus |
Sweetwater County, Wyoming |
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S. gracilis |
southwestern Wyoming |
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Omomyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Anaptomorphus |
A. aemulus |
southwestern Wyoming |
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A. westi |
southwestern Wyoming | ||||
Gazinius |
G. amplus |
central and southern Wyoming | |||
G. bowni |
Uinta County, Wyoming | ||||
Hemiacodon |
H. engardae |
Donna's Locality, Uinta County, Wyoming |
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H. gracilis |
Uinta County, Wyoming |
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Omomys |
O. carteri |
southwestern Wyoming | |||
Trogolemur |
T. myodes |
Sweetwater County, Wyoming |
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Washakius |
W. insignis |
southwestern Wyoming |
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Rodentia
Cylindrodontidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Mysops |
M. fraternus |
Green Locality, Sweetwater County, Wyoming | |||
M. minimus |
Grizzly Buttes, Uinta County, Wyoming | ||||
M. parvus |
Grizzly Buttes, Uinta County, Wyoming |
Ischyromyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Acritoparamys |
A. wyomingensis |
southern Wyoming | |||
Leptotomus |
L. parvus |
southwestern Wyoming | |||
Mytonomys |
M. coloradensis |
Van Houten's Locality, Park County, Wyoming | |||
P. delicatior |
southwestern Wyoming | ||||
P. delicatus |
southwestern Wyoming | ||||
P. hians |
Cottonwood Creek, Sublette County, Wyoming | ||||
P. horribilis |
Grizzly Buttes, Uinta County, Wyoming |
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P. robustus |
southwestern Wyoming | ||||
Quadratomus |
Q. grandis |
southwestern Wyoming | |||
Thisbemys |
T. corrugatus |
southern and central Wyoming | |||
T. perditus |
Sweetwater County, Wyoming |
Paramyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Franimys |
F. buccatus |
Wyoming |
Reithroparamyidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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R. delicatissimus |
western Wyoming | ||||
R. huerfanensis |
southern Wyoming |
Sciuravidae
Genus | Species | Location | Stratigraphic position | Material | Images |
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Knightomys |
K. cuspidatus |
Vass Quarry, Hot Springs County, Wyoming | |||
K. depressus |
central and southern Wyoming | ||||
K. huerfanensis |
central and southern Wyoming | ||||
K. senior |
central and southern Wyoming | ||||
Taxymys |
T. lucaris |
Sublette County, Wyoming | |||
Tillomys |
T. parvidens |
Grizzly Buttes, Uinta County, Wyoming | |||
T. senex |
Sublette County, Wyoming |
Metatherians
Herpetotheriidae
Herpetotheriids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
H. innominatum |
western Wyoming | |||||
H. knighti |
western Wyoming | |||||
P. comstocki |
central Wyoming | |||||
P. marsupium |
southwestern Wyoming |
Peradectidae
Peradectids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
Armintodelphys |
A. blacki |
Lightning Butte, Sweetwater County, Wyoming | ||||
P. chesteri |
southwestern Wyoming |
Birds
Gruiformes
Gruiformes reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
Aletornis |
A. bellus |
Grizzly Buttes, Uinta County, Wyoming | ||||
A. gracilis |
Henry's Fork, Sweetwater County, Wyoming | |||||
A. nobilis |
Grizzly Buttes, Uinta County, Wyoming | |||||
A. pernix |
Henry's Fork, Sweetwater County, Wyoming | |||||
A. venustus |
Henry's Fork, Sweetwater County, Wyoming |
Strigiformes
Owls reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
M. leptosteus |
Grizzly Buttes, Uinta County, Wyoming |
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M. saurodosis |
Lodge-Pole Trail, Uinta County, Wyoming |
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Fish
Amiidae
Amiids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
A. depressus |
Wyoming | |||||
A. newberrianus |
Wyoming |
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Hypamia |
H. elegans |
Dry Creek, Uinta County, Wyoming |
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Pappichthys |
P. cornsonii |
Wyoming |
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P. laevis |
Wyoming |
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A. plicatus |
Wyoming |
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A. sclerops |
Wyoming |
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Protamia |
P. gracilis |
Dry Creek, Uinta County, Wyoming |
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P. media |
Dry Creek, Uinta County, Wyoming |
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P. uintaensis |
Dry Creek, Uinta County, Wyoming |
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Ariidae
Ariids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
Rhineastes |
R. peltatus |
Wyoming | ||||
R. smithii |
Wyoming |
Lepisosteidae
Lepisosteids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
L. atrox |
Wyoming | |||||
L. simplex |
Wyoming |
Osteoglossidae
Osteoglossids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
P. encaustus |
Wyoming | |||||
P. testis |
Wyoming |
Reptiles
Crocodilia
Crocodilians reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
C. elliottii |
Wyoming | |||||
C. grypus |
Wyoming | |||||
C. parvus |
Wyoming | |||||
C. sulciferus |
Wyoming | |||||
Boverisuchus | B. vorax | Wyoming | ||||
Borealosuchus | B. wilsoni | Wyoming | ||||
Allognathosuchus | A. polyodon | Wyoming | ||||
Brachyuranochampsa | B. zangerli | Wyoming |
Squamates
Anguidae
Anguids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
G. sphenodon |
Henry's Fork, Sweetwater County, Wyoming |
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G. sylvestris |
Big Horn and Uinta counties, Wyoming |
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Paraglyptosaurus |
P. princeps |
southwestern Wyoming |
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Xestops |
X. vagans |
southwestern Wyoming |
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Boidae
Boas reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
B. brevis |
Grizzly Buttes, Uinta County, Wyoming |
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B. occidentalis |
Grizzly Buttes, Uinta County, Wyoming |
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Lithophis |
L. sargenti |
Grizzly Buttes, Uinta County, Wyoming |
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Protagras |
P. lacustris |
Cottonwood Creek, Sublette County, Wyoming |
Chamaeleonidae
Chameleons reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
Tinosaurus |
T. pristinus |
Uinta County, Wyoming |
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T. stenodon |
Henry's Fork Hill, Sweetwater County, Wyoming |
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Rhineuridae
Rhineurids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
Lestophis |
L. anceps |
Grizzly Buttes, Uinta County, Wyoming |
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L. crassus |
Marsh Creek, Uinta County, Wyoming |
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S. fossorium |
Twin Buttes, Sweetwater County, Wyoming | Bridger B |
Teiidae
Teiids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
Iguanavus |
I. exilis |
Henry's Fork, Sweetwater County, Wyoming |
Varanidae
Varanids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
S. ensidens |
southern Wyoming |
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S. major |
Lodge-Pole Trail, Uinta County, Wyoming |
Testudines
Baenidae
Baenids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
B. arenosa |
Uinta County, Wyoming |
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C. hebraicum |
Cottonwood Creek, Sublette County, Wyoming | Bridger B |
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C. undatum |
Uinta County, Wyoming |
Carettochelyidae
Carettochelyids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
A. ornata |
southwestern Wyoming | |||||
A. radulina |
Ham's Fork, Lincoln County, Wyoming |
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Dermatemydidae
Dermatemydids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
Baptemys |
B. wyomingensis |
Natrona and Uinta Counties, Wyoming |
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Emydidae
Emydids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
E. jaensi |
Sweetwater County, Wyoming |
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E. latilabiatus |
Blacks Fork, Uinta County, Wyoming | |||||
E. stevensonianus |
Fort Bridger, Uinta County, Wyoming |
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E. wyomingensis |
Fort Bridger, Uinta County, Wyoming |
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Hybemys |
H. arenarius |
Little Sandy Creek, Sublette County, Wyoming |
Geoemydidae
Geoemydids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
E. haydeni |
Levett Creek Quarry, Uinta County, Wyoming |
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E. septaria |
Uinta County, Wyoming | |||||
E. wyomingensis |
Uinta County, Wyoming |
Testudinidae
Testudinids reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
H. allabiatus |
Cottonwood Creek, Sublette County, Wyoming | Bridger B | ||||
H. corsoni |
Cottonwood Creek, Sublette County, Wyoming | Bridger B |
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H. octonaria |
Cottonwood Creek, Sublette County, Wyoming | Bridger B | ||||
H. quadratus |
Cottonwood Creek, Sublette County, Wyoming | Bridger B |
Trionychidae
Trionychids reported from the Bridger Formation | ||||||
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Genus | Species | Location | Stratigraphic position | Material | Images | |
A. extensa |
Grizzly Buttes, Uinta County, Wyoming |
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A. heteroglypta |
Wyoming | |||||
A. postera |
Uinta County, Wyoming | Bridger C |
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A. trionychoides |
Cottonwood Creek, Sublette County, Wyoming |
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A. byssina |
Blacks Fork, Sweetwater County, Wyoming |
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A. cerevisia |
Opal, Lincoln County, Wyoming |
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A. salebrosa |
Dry Creek, Uinta County, Wyoming | Bridger C |
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A. uintaensis |
Little Dry Creek, Uinta County, Wyoming | |||||
Hummelichelys |
H. annae |
Sweetwater County, Wyoming |
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H. ellipticus |
Grizzly Buttes, Uinta County, Wyoming |
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H. grangeri |
Cottonwood Creek, Sublette County, Wyoming |
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H. guttatus |
Uinta County, Wyoming | |||||
Plastomenus |
P. molopinus |
Grizzly Buttes, Uinta County, Wyoming |
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P. oedemius |
Sublette and Uinta Counties, Wyoming | Bridger B |
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P. tantillus |
Cottonwood Creek, Sublette County, Wyoming | Bridger B |
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P. thomasi |
Sublette and Uinta Counties, Wyoming |
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P. visendus |
Rattlesnake Hills, Fremont County, Wyoming |
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Platypeltis |
P. serialis |
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P. trepida |
Grizzly Buttes, Uinta County, Wyoming |
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T. concentricus |
Cottonwood Creek, Sublette County, Wyoming |
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Incertae sedis
Reptiles of uncertain placement reported from the Bridger Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Images | |
Naocephalus |
N. porrectus |
Cottonwood Creek, Sublette County, Wyoming | Bridger B |