McCarty's Mountain: Chadronian, Montana
collected by Earl Douglass
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Anguidae
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Helodermoides tuberculatus
Douglass 1903
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Sullivan 1979 | 1 specimen | ||||||||
CM 9975, nearly complete skull and gular region, body osteoderms, vertebrae, and ribs | ||||||||||
Glyptosaurus montanus n. sp.
Douglass 1908
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Gilmore 1928 | 1 specimen | ||||||||
CM 1050 (holotype), nearly complete skull and lower jaws, partial limb and phalangeal bones. | ||||||||||
Reptilia
- Testudines
- Testudinidae
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Testudo peragrans n. sp.
Hay 1906
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Hay 1906 | |||||||||
CM 1101 (holotype), a skull and shell | ||||||||||
Mammalia
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Copedelphys cf. titanelix
(Matthew 1903)
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Tabrum et al. 1996 | |||||||||
"Peratherium" | ||||||||||
Herpetotherium valens
(Lambe 1908)
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Tabrum et al. 1996 | |||||||||
"Peratherium" | ||||||||||
Mammalia
- Micropternodontidae
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Micropternodus sp.
Matthew 1903
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Tabrum et al. 1996 | |||||||||
Cryptoryctes kayi
Reed 1954
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Reed and Turnbull 1965 | |||||||||
omitted by Tabrum et al. 1996, reasons unclear | ||||||||||
Mammalia
- Apternodontidae
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Apternodus informal sp.
Matthew 1903
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= Apternodus sp.
Matthew 1903
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Tabrum et al. 1996 | |||||||||
replaces ID of Novacek 1976 (had to put original in <> because this reID is a duplicate and it wouldn't let me leave the page otherwise - TJC) | ||||||||||
= Apternodus baladontus n. sp.
Asher et al. 2002
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Asher et al. 2002 | |||||||||
Mammalia
- Oromerycidae
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Montanatylopus matthewi n. sp.
Prothero 1986
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Prothero 1986 | |||||||||
DUPLICATE REF 2800 or 2815 (17 measurements) | ||||||||||
Mammalia
- Merycoidodontidae
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Merycoidodontidae indet.
Cook 1912
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Tabrum et al. 1996 | |||||||||
large; probably "M. macrorhinus" of Storer 1978 | ||||||||||
Limnenetes sp.
Douglass 1902
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= Limnenetes platyceps
Douglass 1902
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Schultz and Falkenbach 1956 | |||||||||
from Bed U; L. sp. in "upper layer of exposure Z" | ||||||||||
Oreonetes anceps
(Douglass 1902)
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Schultz and Falkenbach 1956 | |||||||||
Bathygenys cf. alpha
Douglass 1902
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Tabrum et al. 1996 | |||||||||
Mammalia
- Agriochoeridae
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Agriochoerus minimus
Douglass 1902
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probably includes Douglass' "Agriochoerus sp." | ||||||||||
Mammalia
- Leptomerycidae
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Leptomerycidae indet.
Zittel 1893
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Tabrum et al. 1996 | |||||||||
"Leptomeryx" said to be new | ||||||||||
"Leptomeryx" sp.
Leidy 1853
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= "Leptomeryx" aff. speciosus
Lambe 1908
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Tabrum et al. 1996 | |||||||||
replaces ID of Black 1978, and apparently "Hendromeryx | ||||||||||
Mammalia
- Perissodactyla
- Rhinocerotidae
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Rhinocerotidae indet.
Gray 1821
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Tabrum et al. 1996 | |||||||||
Penetrigonias dakotensis
(Peterson 1920)
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Prothero 2005 | |||||||||
Mammalia
- Perissodactyla
- Hyracodontidae
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Triplopides rieli n. sp.
Radinsky 1967
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Radinsky 1967 | |||||||||
Hyracodon sp.
Leidy 1856
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= Hyracodon priscidens
Lambe 1905
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Prothero 1996 | |||||||||
Mammalia
- Perissodactyla
- Tapiridae
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? Colodon cingulatus
Douglass 1902
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Radinsky 1963 | |||||||||
Mammalia
- Perissodactyla
- Equidae
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Mesohippus sp.
Marsh 1875
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confirmed by Tabrum et al. 1996 | ||||||||||
Mammalia
- Perissodactyla
- Brontotheriidae
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Brontotheriidae indet.
(Marsh 1873)
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"Titanotherium" | ||||||||||
Mammalia
- Carnivora
- Canidae
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Hesperocyon sp.
Scott 1890
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Tabrum et al. 1996 | |||||||||
Mammalia
- Carnivora
- Amphicyonidae
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cf. Daphoenictis sp.
Hunt 1974
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Tabrum et al. 1996 | |||||||||
Mammalia
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"Miacis" sp.
Cope 1872
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Tabrum et al. 1996 | |||||||||
said to be new | ||||||||||
Mammalia
- Creodonta
- Hyaenodontidae
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Hyaenodon sp.
Laizer and Parieu 1838
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Mammalia
- Epoicotheriidae
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Xenotherium unicum n. sp.
Douglass 1905
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Mammalia
- Lagomorpha
- Leporidae
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? Megalagus sp.
Walker 1931
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Tabrum et al. 1996 | |||||||||
said to be new | ||||||||||
Palaeolagus sp.
Leidy 1856
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confirmed by Tabrum et al. 1996 | ||||||||||
Mammalia
- Rodentia
- Eomyidae
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Paradjidaumo sp.
Burke 1934
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Tabrum et al. 1996 | |||||||||
said to be new | ||||||||||
Paradjidaumo cf. trilophus
(Cope 1873)
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Tabrum et al. 1996 | |||||||||
Mammalia
- Rodentia
- Heliscomyidae
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Heliscomys cf. ostranderi
Korth et al. 1991
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Tabrum et al. 1996 | |||||||||
Mammalia
- Rodentia
- Cylindrodontidae
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Cylindrodon fontis
Douglass 1902
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= Cylindrodon sp.
Douglass 1902
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Wood 1980 | |||||||||
see discussion of this species by Emry and Korth 1996a | ||||||||||
Ardynomys occidentalis n. sp.
Burke 1936
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Burke 1936 | |||||||||
Pseudocylindrodon medius n. sp.
Burke 1938
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Wood 1980 | |||||||||
Mammalia
- Rodentia
- Ischyromyidae
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Ischyromys douglassi n. sp.
Black 1968
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Black 1968 | |||||||||
DUPLICATE REF 1085 or 1086 | ||||||||||
Mammalia
- Leptictidae
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Ictops magnus
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Ictops montanus
Douglass 1905
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Leptictis montanus
(Douglass 1905)
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see common names |
Geography
Country: | United States | State/province: | Montana | County: | Madison |
Coordinates: | 45.5° North, 112.6° West (view map) | ||||
Paleocoordinates: | 47.3° North, 103.8° West | ||||
Basis of coordinate: | stated in text |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
*Period: | Tertiary | ||
Key time interval: | Chadronian | ||
Age range of interval: | 37 - 33.9 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Geological group: | White River | Formation: | Chadron | ||
Stratigraphy comments: "Titanotherium beds, Lower White River formation" - Gilmore 1928.
Lower White River/Titanotherium beds = Chadron Fm (Hoganson et al., 1998) |
Lithology and environment
Primary lithology: | fine,quartzose,gray tuff |
Lithology description: The tuff is composed primarily of partially altered shards of volcanic glass with quartz grains, plagioclase, calcite and iron oxides in a clay matrix. The clay matrix, identified by Mr. T. Mowatt using x-ray diffraction, is montmorilionite. The color of the sedimentary tuff, which is due largely to the clays, varies from light buff to light gray. (Riel 1963) | |
Environment: | wet floodplain |
Geology comments: McCarty's Mountain Lower Oligocene sediments were deposited on a floodplain,
The water table must have been very near and in places above the surface providing conditions too moist for large trees, but suitable for shrubs and other low vegetation. Frequent and widespread flooding of the floodplain by sluggish streams took place. The flooding could be the result of rainfall or could be caused by faulting and/or plugging of the watercourses by lava and ash from the widespread volcanic activity in the area as postulated by Pardee (1950), Freeman, Ruppel, and Klepper (1958), and Mann (1954). The lower and upper beds in the measured section were deposited at the basin margin as indicated by the very large boulders of andesite brought into the sediment by swift-flowing small tributary streams. The lack of channels in the middle beds could indicate that the margin of the basin had shifted and the area of deposition was no longer at the edge of the basin. Renewed faulting might explain the re-occurrence of tributary channels in the upper beds. However, the lock of any unconformity within the sequence argues against this interpretation. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
Reason for describing collection: | general faunal/floral analysis |
Collectors: | Earl Douglass |
Taxonomic list comments:placement of Douglass' "Ictops" species, following Novacek 1976: montanus valid, but not Leptictis sensu stricto intermedius syn. of montanus tenuis syn. of montanus major nomen dubium - listed by Tabrum et al. 1996, reason not stated "Ischyromys typus" is NOT present, this material is "Titanotheriomys": Wood 1980 |
Metadata
Also known as: | North of Big Hole River; South side of McCarty's Mountain; McCartney Mountain; MV 5813; MV 5908; MV 6201; MV 6202 | ||
Database number: | 16990 | ||
Authorizer: | J. Alroy, G. Liggett, P. Barrett, E. Vlachos, J. Marcot | Enterer: | J. Alroy, G. Liggett, T. Cleary, J. Marcot, E. Vlachos |
Modifier: | T. Cleary | Research group: | vertebrate |
Created: | 2002-05-15 00:00:00 | Last modified: | 2016-09-20 05:31:07 |
Access level: | the public | Released: | 2002-05-15 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1383. | E. Douglass. 1905. The Tertiary of Montana. Memoirs of the Carnegie Museum 2(5):203-221 [J. Alroy/J. Alroy/J. Marcot] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
1085 | C. C. Black. 1968. The Oligocene rodent Ischyromys and discussion of the family Ischyromyidae. Annals of Carnegie Museum 39(18) [J. Alroy/J. Alroy/J. Ju] | |
6278 | J. J. Burke. 1936. Ardynomys and Desmatolagus in the North American Oligocene. Annals of Carnegie Museum 25:133-154 [J. Alroy/J. Alroy/J. Alroy] | |
14538 | C. W. Gilmore. 1928. Fossil lizards of North America. Memoirs of the National Academy of Sciences 22(3):1-201 [J. Head/J. Head/M. Carrano] | |
38866 | G. Hahn and R. Hahn. 1992. Neue Multituberculaten-Zähne aus der Unter-Kreide (Barremium) von Spanien (Galve un Uña). Geologica et Palaeontologica 26:143-162 [R. Benson/R. Benson/R. Benson] | |
64739 | O. P. Hay. 1906. Descriptions of new species of turtles of the genus Testudo, collected from the Miocene by the Carnegie Museum; together with a description of the skull of Stylemys nebrascensis. Annals of Carnegie Museum 4:15-20 [E. Vlachos/E. Vlachos] | |
1924 | J. W. Hoganson, E. C. Murphy, and N. F. Forsman. 1998. Chadron, Brule, and Arikaree Formations, North Dakota. In D. O. Terry, H. E. LaGarry, R. M. Hunt Jr. (eds.), Geological Society of America Special Paper: Depositional Environments, Lithostratigraphy, and Biostratigraphy of the White River and Arikaree Groups (Late Eocene to Early Miocene, North America) 325:185-196 [J. Alroy/J. Alroy/T. Cleary] | |
2800 | D. R. Prothero. 1986. A New Oromerycid (Mammalia, Artiodactyla) from the Early Oligocene of Montana. Journal of Paleontology 60(2):458-465 [J. Alroy/J. Alroy/J. Ju] | |
6272 | D. R. Prothero. 1996. Hyracodontidae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 652-663 [J. Alroy/J. Alroy/J. Alroy] | |
51726 | D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot] | |
2818 | L. B. Radinsky. 1963. Origin and Early Evolution of North American Tapiroidea. Peabody Museum of Natural History Bulletin 17:1-118 [J. Alroy/J. Alroy/J. Marcot] | |
2824 | L. B. Radinsky. 1967. A Review of the Rhinocerotoid Family Hyracodontidae (Perissodactyla). Bulletin of the American Museum of Natural History 136(1):1-46 [J. Alroy/J. Alroy/J. Marcot] | |
2847 | C. A. Reed and W. D. Turnbull. 1965. The Mammalian Genera Arctoryctes and Cryptoryctes From the Oligocene and Miocene of North America. Fieldiana 15(2) [J. Alroy/J. Alroy/J. Ju] | |
60394 | S. J. Riel. 1963. A basal Oligocene local fauna from McCarty's Mountain southwestern Montana. University of Montana Theses, Dissertations, Professional Papers 7142:1-90 [P. Barrett/T. Cleary] | |
3068 | C. B. Schultz and C. H. Falkenbach. 1956. Miniochoerinae and Oreonetinae two new subfamilies of oreodonts. Bulletin of the American Museum of Natural History 109(4):373-482 [J. Alroy/J. Alroy/J. Marcot] | |
9065 | 5% 49760 | G. G. Simpson. 1927. A North American Oligocene edentate. Annals of Carnegie Museum 17(2):283-299 [J. Alroy/J. Alroy/J. Alroy] |
60385 | R. M. Sullivan. 1979. Revision of the Paleogene genus Glyptosaurus (Reptilia, Anguidae). Bulletin of the American Museum of Natural History 163(1):1-72 [P. Barrett/T. Cleary] | |
3359 | A. R. Tabrum, D. R. Prothero, and D. Garcia. 1996. Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 278-311 [J. Alroy/J. Alroy/J. Alroy] | |
3661 | J. A. Wilson. 1971. Early Tertiary vertebrate faunas, Vieja Group. Trans-Pecos Texas: Agriochoeridae and Merycoidodontidae. Texas Memorial Museum Bulletin 18:1-83 [J. Alroy/J. Alroy/J. Alroy] | |
3737 | A. E. Wood. 1980. The Oligocene Rodents of North America. Transactions of the American Philosophical Society 70(5):1-68 [J. Alroy/J. Alroy/J. Ju] |