Myton Pocket (Eocene of the United States)
Also known as Protylopus Quarry
Where: Duchesne County, Utah (40.2° N, 109.9° W: paleocoordinates 43.0° N, 98.9° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: lower Myton Member (Uinta Formation), Uintan (46.2 - 39.7 Ma)
Environment/lithology: terrestrial; lithology not reported
Size class: macrofossils
Primary reference: J. L. Kay. 1957. The Eocene vertebrates of the Uinta Basin, Utah. Intermountain Association of Petroleum Geologists, Guidebook, 8th Annual Field Conference 110-114 [J. Alroy/J. Alroy]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 16607: authorized by John Alroy, entered by John Alroy on 12.04.1997
Creative Commons license: CC BY (attribution)
Taxonomic list
• according to Burke 1934b, Myton Pocket was not discovered until 1912, so earlier Uinta C records cannot belong to it
Kay's list is for all of Uinta C; I have removed records not tied to Myton Pocket by revised list of Prothero 1996a or other sources
Black and Sutton also list "Leptotomus grangeri"
Myton Pocket is 7 mi. E of Myton, Duchesne Co. (often said to be 6 mi E or SE of Myton) and is close to the base of Uinta C
Protylopus Quarry is within Myton Pocket
"Uintatherium sp." of Kay is probably erroneous, see Wheeler 1961
"Hyrachyus sp." could be Triplopus sensu Radinsky 1967a and no specimens are discussed in the literature
"Mesamynodon medius" of Kay is of unclear status because no material of this species or its sometime synonym "Hyracodon primus" has ever been attributed to the Uinta Fm. sensu stricto
"Hylomeryx simplicidens" of Kay appears to be a nomen nudum
"Achaenodon sp." is listed by Kay, but no other publication suggests that this genus is present above Uinta B
"Simimeryx minutus" is listed by Kay, but no specimen other than the type from Red Narrows is discussed in the literature
Kay's list is for all of Uinta C; I have removed records not tied to Myton Pocket by revised list of Prothero 1996a or other sources
Black and Sutton also list "Leptotomus grangeri"
Myton Pocket is 7 mi. E of Myton, Duchesne Co. (often said to be 6 mi E or SE of Myton) and is close to the base of Uinta C
Protylopus Quarry is within Myton Pocket
"Uintatherium sp." of Kay is probably erroneous, see Wheeler 1961
"Hyrachyus sp." could be Triplopus sensu Radinsky 1967a and no specimens are discussed in the literature
"Mesamynodon medius" of Kay is of unclear status because no material of this species or its sometime synonym "Hyracodon primus" has ever been attributed to the Uinta Fm. sensu stricto
"Hylomeryx simplicidens" of Kay appears to be a nomen nudum
"Achaenodon sp." is listed by Kay, but no other publication suggests that this genus is present above Uinta B
"Simimeryx minutus" is listed by Kay, but no specimen other than the type from Red Narrows is discussed in the literature
Show authors, comments, and common names
| Aves | |
Eonessa anaticula n. gen. n. sp.13
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| Reptilia | |
Procaimanoidea utahensis n. gen. n. sp.6
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| Mammalia | |
"Pleurocyon magnus n. gen. n. sp." = Simidectes magnus10
"Pleurocyon magnus n. gen. n. sp." = Simidectes magnus10 Peterson 1919 mesonychian 6 mi SE of Myton, near base of Myton Mbr. horizon C, and also possibly from horizon B; "Pleurocyon magnum"
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Harpagolestes leotensis11 Peterson 1931 condylarth Myton Pocket; presumably "Mesonyx uintensis" of Kay 1957; may include "Uinta C" record of West 1981
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Procynodictis vulpiceps3 Wortman and Matthew 1899 placental Uinta C, confirmed as Myton Pocket by Prothero 1996a; includes type and referred specimen of "Miacis gracilis" of Clark 1939 from "7 miles east and south of Myton": see also Wang and Tedford 1994
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Brontotheriidae indet.1 Marsh 1873 brontothere genus listed at Myton Pocket by Prothero 1996a; genus invalid according to Mader 2000; also "Brontotherium curtum": status unclear as Mader 1989 restricts Megacerops to the Chadronian
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Uintaceras radinskyi n. sp.7
Uintaceras radinskyi n. sp.7 Holbrook and Lucas 1997 rhinoceros Myton Pocket; "Forstercooperia sp." of Holbrook 1994
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Epitriplopus uintensis1 Peterson 1919 odd-toed ungulate from Myton Pocket (see Peterson 1919) and also "E. sp.": see Radinsky 1967a
Triplopus obliquidens1 Scott and Osborn 1887 odd-toed ungulate also "Triplopus sp.": former from Myton Pocket, see Peterson 1919
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Amynodon advenus11 Marsh 1875 odd-toed ungulate Myton Pocket; probably includes "A. intermedius" and "A. advenum?" of Wall 1982 from Uinta C
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"Isectolophus annectens n. sp." = Isectolophus annectens10, "Schizolophodon cuspidens n. gen. n. sp." = Isectolophus annectens10
"Isectolophus annectens n. sp." = Isectolophus annectens10 Scott and Osborn 1887 odd-toed ungulate Myton Pocket; not clear why this is omitted by Kay, who may have been confused by the unclear provenance of the type; also includes his "Parisectolophus sp."
"Schizolophodon cuspidens n. gen. n. sp." = Isectolophus annectens10 Scott and Osborn 1887 odd-toed ungulate | |
"Bunomeryx elegans" = Bunomeryx montanus, Hylomeryx quadricuspis10, Mytonomeryx scotti n. sp.4, Pentacemylus progressus4, Auxontodon pattersoni5
"Bunomeryx elegans" = Bunomeryx montanus Wortman 1898 even-toed ungulate at Myton Pocket: Prothero 1996a
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Poebrodon kayi n. sp.4
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Leptotragulus medius n. sp. Peterson 1919 protoceratid at Myton Pocket, including 23 specimens from Protylopus Quarry, and type is from "Uinta C, 6 miles east of Myton," which appears to be the same locality: see Gazin 1955
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Agriochoeridae indet., "Agriochoerus matthewi" = Diplobunops matthewi10, Protoreodon petersoni n. sp.4, "Protoreodon pumilus" = Protoreodon pumilus, "Protoreodon medius n. sp." = Protoreodon pumilus10
Agriochoeridae indet. Leidy 1869 agriochoerid
"Agriochoerus matthewi" = Diplobunops matthewi10 Peterson 1919 agriochoerid Myton Pocket; see also Peterson 1931c, Black 1978
"Protoreodon pumilus" = Protoreodon pumilus Marsh 1875 agriochoerid see Gazin 1955: includes "Protagriochoerus annectens" from Myton Pocket, see Gazin 1955
"Protoreodon medius n. sp." = Protoreodon pumilus10 Marsh 1875 agriochoerid Peterson 1919 very clearly lists type of "P. medius" from Myton Pocket, but no Uinta C material is indicated by Prothero 1996a
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Talpavus duplus n. sp.8
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Mytonolagus petersoni n. sp.
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Pareumys milleri n. sp.10
Pareumys milleri n. sp.10 Peterson 1919 rodent Myton Pocket; said by Prothero 1996a to be from White River Pocket
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Janimus rhinophilus n. sp.2
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Thisbemys medius1, Paramys compressidens n. sp., "Prosciurus robustus n. sp." = Mytonomys robustus10, Pseudotomus eugenei1
Thisbemys medius1 Peterson 1919 rodent from Myton Pocket according to Peterson 1919, but from "three miles west of Chipeta Wall" according to Wood 1962 (this locality is not discussed by any other author)
"Prosciurus robustus n. sp." = Mytonomys robustus10 Peterson 1919 rodent from "Horizon C... six miles east of Myton"
Pseudotomus eugenei1 Burke 1935 rodent referred specimen is from Myton Pocket, but type is from Myton Mbr. at "Head of west fork of Antelope Draw, beneath the rim of Deadman Bench, Uinta County": Burke 1935a; I cannot locate Antelope Draw, but Kay 1934 shows Deadman Bench as running most of the way between Ouray and Kennedy's Hole north of the White River, so this may be in Uinta C in the Wagonhound Canyon section
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