Horsetail Creek (Eocene of the United States)
Also known as Horse Tail Creek
Where: Logan County, Colorado (40.8° N, 103.1° W: paleocoordinates 42.1° N, 94.6° W)
• coordinate based on political unit
When: Horsetail Creek Member (White River Formation), Chadronian (37.2 - 33.9 Ma)
Environment/lithology: terrestrial; lithology not reported
Size class: macrofossils
Primary reference: E. D. Cope. 1875. Report on the vertebrate paleontology of Colorado. Annual Report of the United States Geological and Geographical Survey of the Territories 1873:427-533 [M. Carrano/M. Carrano/M. Carrano]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 16977: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot, Terri Cleary and Evangelos Vlachos
Creative Commons license: CC BY (attribution)
Taxonomic list
• entire member is of reversed polarity: Prothero 1996c
"Cylindrodon fontis": Galbreath 1969 see discussion of this species by Emry and Korth 1996a; Molly and Mabel loc., Section 36 loc., and Shable Butte loc.
"Caenopus mitis" is of uncertain provenance
"Archaeotherium ramosus" and "A. potens" are of uncertain provenance
"Cylindrodon fontis": Galbreath 1969 see discussion of this species by Emry and Korth 1996a; Molly and Mabel loc., Section 36 loc., and Shable Butte loc.
"Caenopus mitis" is of uncertain provenance
"Archaeotherium ramosus" and "A. potens" are of uncertain provenance
•list excludes Trigonias Quarry (see)
Show authors, comments, and common names
| Mammalia | |
"Peratherium fugax" = Herpetotherium fugax5
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"Symborodon bucco n. sp." = Megacerops bucco1, Megacerops riggsi n. sp.13, "Megaceratops acer n. sp." = Megacerops acer2, "Megaceratops helocerus n. sp." = Menodus heloceras2, "Symborodon torvus n. gen. n. sp." = Menodus torvus2
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"Mesohippus proteulophus" = Mesohippus bairdi5
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"Aceratherium mite n. sp." = Subhyracodon mitis Cope 1875 rhinoceros | |
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Archaeotherium mortoni5, Archaeotherium crassum5, "Archaeotherium ramosus" = Pelonax ramosus5, "Archaeotherium potens" = Pelonax potens5
Archaeotherium mortoni5 Leidy 1850 even-toed ungulate includes "A. crassum"; latter is said by Troxell 1920c to be from "Probably Cedar Creek beds... near Gerry's Ranch"; assignment to Horsetail Creek by Galbreath based on co-occurrence with titanotheres
"Archaeotherium ramosus" = Pelonax ramosus5 Cope 1874 even-toed ungulate "Occurrence probably here rather than in the Cedar Creek member, but not yet demonstrated"
"Archaeotherium potens" = Pelonax potens5 Marsh 1893 even-toed ungulate "Occurrence probably here rather than in the Cedar Creek member, but not yet demonstrated"
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"Merycoidodon gracilis" = Miniochoerus gracilis5, "Merycoidodon culbertsoni" = Merycoidodon culbertsonii5, "Genetochoerus periculorum n. gen. n. sp." = Merycoidodon culbertsonii15
"Genetochoerus periculorum n. gen. n. sp." = Merycoidodon culbertsonii15 Leidy 1848 oreodont AM 6397 (holotype)
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"Parictis dakotensis" = Subparictis dakotensis5
"Parictis dakotensis" = Subparictis dakotensis5 Clark 1936 carnivoran confirmed by Baskin and Tedford 1996
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Brachyrhynchocyon sp.9 Scott and Jepsen 1936 bear-dog "Chadronian... Cedar Creek area, Logan/Weld Cos."
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"Pseudocynodictis paterculus" = Hesperocyon gregarius5
"Pseudocynodictis paterculus" = Hesperocyon gregarius5 Cope 1873 canid localities listed by Wang 1994 include Two Miles Creek, KU-CO-071; Peevy Ranch, George Creek, KU-CO-088
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Centimanomys major6, Centimanomys galbreathi12, Adjidaumo cf. minimus16, "Paradjidaumo trilophus" = Adjidaumo trilophus5
Adjidaumo cf. minimus16 Matthew 1903 rodent not A. minutus, contra Wood 1969: "A. small sp." of Galbreath; presumably "A. minutus" of Wahlert 1978 from "near Trigonias Quarry, Weld Co., Colorado, ?Chadronian"
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Eumys sp.11 Leidy 1856 mouse new specimen, provenance considered certain based on association with titanothere
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| Reptilia | |
Cremastosaurus rhambastes n. sp.7
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"Rhineura coloradoensis n. sp." = Rhineura hatcherii7
"Rhineura coloradoensis n. sp." = Rhineura hatcherii7 Baur 1893 worm lizard AMNH 1607 (holotype), three and a half articulated median dorsal vertebrae
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Testudo culbratus n. sp.2
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"Testudo ligonius n. sp." = Stylemys nebrascensis2, "Testudo amphithorax n. sp." = Stylemys nebrascensis2, "Testudo laticuneus n. sp." = Gopherus laticuneus2, Testudo quadratus n. sp.3
Testudo quadratus n. sp.3 Cope 1884 turtle AMNH 1149 (holotype), a fragmentary epiplastron and partial nuchal (Hay 1908, figs. 532, 533)
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