Rancho El Ocote (Basal): Late/Upper Hemphillian, Mexico
collected by O. Carranza-Castañeda
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Lagomorpha
- Leporidae
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Notolagus velox
Wilson 1937
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Miller and Carranza-Castaneda 1998 | |||||||||
Mammalia
- Perissodactyla
- Rhinocerotidae
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Teleoceras ocotensis
Dalquest and Mooser 1980
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Dalquest and Mooser 1980 | |||||||||
(1 measurement) | ||||||||||
= Teleoceras fossiger
Cope 1878
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Carranza-Castaneda 1989 | |||||||||
= Teleoceras hicksi
Cook 1927
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Prothero 1998 | |||||||||
Mammalia
- Perissodactyla
- Equidae
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Nannippus minor
(Sellards 1916)
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= Nannippus aztecus
Mooser 1968
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Alroy 2002 | |||||||||
Neohipparion eurystyle
(Cope 1893)
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includes "N. otomii" in part; "N. monias" | ||||||||||
Neohipparion otomii n. sp.
Mooser 1959
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Mooser 1959 | |||||||||
synonym of Neohipparion eurystyle | ||||||||||
Neohipparion monias n. sp.
Mooser 1963
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Mooser 1963 | |||||||||
synonym of Neohipparion eurystyle | ||||||||||
Dinohippus mexicanus
(Lance 1950)
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original and current combination Pliohippus (Pliohippus) mexicanus | ||||||||||
includes "D. ocotensis" | ||||||||||
Protohippus muelleri n. sp.
Mooser 1964
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Mooser 1964 | |||||||||
synonym of Pliohippus (Pliohippus) mexicanus | ||||||||||
Hippotigris ocotensis n. sp.
Mooser 1958
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Mooser 1958 | |||||||||
synonym of Pliohippus (Pliohippus) mexicanus | ||||||||||
Astrohippus stockii
(Lance 1950)
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original and current combination Pliohippus (Astrohippus) stockii | ||||||||||
includes "A. albidens" | ||||||||||
Mammalia
- Tayassuidae
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Desmathyus brachydontus n. sp.
Dalquest and Mooser 1980
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Dalquest and Mooser 1980 | |||||||||
(3 measurements) | ||||||||||
= Catagonus brachydontus
Dalquest and Mooser 1980
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Alroy 2002 | |||||||||
recombined as Protherohyus brachydontus | ||||||||||
see Dalquest and Mooser 1980a; probably includes "Prosthennops sp." of Carranza 1989 and Miller and Carranza 1998a | ||||||||||
Mammalia
- Camelidae
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cf. Alforjas sp.
Harrison 1979
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see also Montellano 1989: presumably includes "Pliauchenia sp." | ||||||||||
Megatylopus cf. matthewi
Webb 1965
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Dalquest and Mooser 1980 | |||||||||
concurs with Montellano 1989 (1 measurement) | ||||||||||
Palaeolama guanajuatensis n. sp.
Dalquest and Mooser 1980
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Dalquest and Mooser 1980 | |||||||||
recombined as Hemiauchenia guanajuatensis | ||||||||||
Hemiauchenia vera
(Matthew 1909)
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Miller and Carranza-Castaneda 1998 | |||||||||
recombined as Pleiolama vera | ||||||||||
Mammalia
- Antilocapridae
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Hexobelomeryx sp.
Furlong 1941
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= Hexobelomeryx cf. fricki
Furlong 1941
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Miller and Carranza-Castaneda 1998 | |||||||||
Mammalia
- Carnivora
- Felidae
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Pseudaelurus ? intrepidus
(Leidy 1858)
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Carranza-Castaneda and Miller 1996 | |||||||||
"Rancho El Ocote" - probably this level because Carranza 1989 lists "P. sp." | ||||||||||
Mammalia
- Carnivora
- Ursidae
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Agriotherium schneideri
Sellards 1916
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Miller and Carranza-Castaneda 1998 | |||||||||
recombined as Huracan schneideri | ||||||||||
Mammalia
- Carnivora
- Canidae
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Canis ferox n. sp.
Miller and Carranza-Castaneda 1998
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Miller and Carranza-Castaneda 1998 | |||||||||
recombined as Eucyon ferox | ||||||||||
Rancho San Martin, 2 km NE of Rancho Viejo, lower Rancho Viejo beds | ||||||||||
cf. Osteoborus cyonoides
(Martin 1928)
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Dalquest and Mooser 1980 | |||||||||
= Borophagus secundus
VanderHoof 1931
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Miller and Carranza-Castaneda 1998 | |||||||||
"O. sp."; confirmed by Wang et al. 1999 DUPLICATE REF 2596 or 2597 | ||||||||||
Mammalia
- Megalonychidae
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Megalonyx sp.
Harlan 1825
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Dalquest and Mooser 1980 | |||||||||
Mammalia
- Mylodontidae
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Paramylodon sp.
Brown 1903
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= Mylodontidae indet.
Ameghino 1889
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Carranza-Castaneda et al. 2000 | |||||||||
status unclear in light of Glossotherium vs. Paramylodon taxonomy problem | ||||||||||
Mammalia
- Proboscidea
- Gomphotheriidae
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Rhynchotherium sp.
Falconer 1868
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Dalquest and Mooser 1980 | |||||||||
see common names |
Geography
Country: | Mexico | State/province: | Guanajuato |
Coordinates: | 21.1° North, 100.7° West (view map) | ||
Paleocoordinates: | 21.4° North, 99.1° West | ||
Basis of coordinate: | based on nearby landmark | ||
Altitude: | 2000 meters | ||
Geographic resolution: | outcrop |
Time
Period: | Neogene | ||
10 m.y. bin: | Cenozoic 6 | ||
*Period: | Tertiary | *Epoch: | Miocene | *Local age/stage: | Late/Upper Hemphillian |
Key time interval: | Late/Upper Hemphillian | ||
Age range of interval: | 10.30000 - 4.90000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Rancho Viejo Beds | ||||
Local section: | Ocote | Local bed: | 1 | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: apparently includes the Rhino Layer of Flynn et al. 2005, and therefore also the underlying Proboscidean layer; they report a fission track date of 4.8 +/- 0.2 Ma beneath the Proboscidean layer, and the GMPTS chron C3n.4n/C3n.3r transition falls in between the two layers
from the "lower unit, 2-4 m thick" (Carranza-Castañeda and Walton 1992) |
Lithology and environment
Primary lithology: | green conglomeratic claystone |
Secondary lithology: | coarse sandstone |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: Arellano (1951): "Bone-bed about 2m thick, of white to light green or yellowish silty sand with coarser detritus disseminated, or in pockets or lenses" Carranza-Castañeda and Walton 1992: "green swelling clay. Pockets of gravel lag consist of subangular to rounded rhyolite and basalt clasts of 3-6 cm (maximum 10 cm) diameter"; macrofossils at GTO 2b are from this "basal clay" and those at GTO 2c are from a "sand and gravel zone (probably a local channel)" | |
Environment: | fluvial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Disassociated minor elements: | some |
Collection methods and comments
Collection excludes: | some genera |
Collection methods: | selective quarrying |
Reason for describing collection: | general faunal/floral analysis |
Collectors: | O. Carranza-Castañeda |
Collection method comments: collected by "trenching" (Carranza-Castañeda and Walton 1992) | |
Taxonomic list comments:Rancho El Ocote in general spans several meters and three faunal zones: list of Miller and Carranza 1984 is a composite, and that of Dalquest and Mooser 1980a appears to span the lower two zones
following records are of uncertain provenance: ? Indarctos sp. Dalquest and Mooser 1980a Neohipparion gidleyi MacFadden 1984b: "N. otomii" in part not clear what "Nannippus hesperides" of Dalquest and Mooser 1980a is, but the holotype is clearly a large form of Nannippus: JA pers. obs. 12.1.93; looks more like a medium-sized Neohipparion, especially the referred lower tooth; JA 9.6.96 Machairodus sp. - not described by Carranza and Miller 1996, and record probably pertains to either Arroyo Tepalcates or Rinconada (see); however, M. cf. coloradensis is implied to be present by Miller and Carranza 1998a |
Metadata
Also known as: | GTO-2; TMM 41685; Arroyo de la Carreta; Rhino layer | ||
Database number: | 18737 | ||
Authorizer: | J. Alroy, J. Marcot | Enterer: | J. Alroy, J. Marcot, J. Wertheim |
Modifier: | P. Mannion | Research group: | vertebrate |
Created: | 1995-03-26 00:00:00 | Last modified: | 2020-08-11 08:55:05 |
Access level: | the public | Released: | 1995-03-26 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1175. | O. Carranza-Castaneda. 1989. Rinocerontes de la fauna local Rancho el Ocote, Mioceno Tardio (Hemfiliano tardio) de estado de Guanajuato. Universidad Nacional Autónoma de México, Instituto de Geológia, Revista, Publicación Especial 8(1):88-99 [J. Alroy/J. Alroy/M. Uhen] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
1179 | O. Carranza-Castaneda and W. E. Miller. 1996. Hemphillian and Blancan felids from central Mexico. Journal of Paleontology 70(3):509-518 [J. Alroy/J. Alroy/J. Marcot] | |
1182 | O. Carranza-Castaneda, W. E. Miller, and B. J. Kowallis. 2000. Recent discoveries of South America immigrants in faunas from central Mexico with radiometric dates. Journal of Vertebrate Paleontology 20(3):34A [J. Alroy/J. Alroy/J. Ju] | |
25387 | O. Carranza-Castañeda and A. H. Walton. 1992. Cricetid rodents from the Rancho El Ocote fauna, late Hemphillian (Pliocene), State of Guanajuato. Universidad Nacional Autónoma de México, Instituto de Geologia, Revista 10(1):71-93 [J. Alroy/J. Alroy] | |
1323 | 5% 32840 | W. W. Dalquest and O. Mooser. 1980. Late Hemphillian mammals of the Ocote local fauna, Guanajuato, Mexico. Pearce-Sellards Series 32:1-25 [J. Alroy/J. Alroy/J. Alroy] |
1324 | W. W. Dalquest and O. Mooser. 1980. Arctodus pristinus Leidy in the Pleistocene of Aguascalientes, Mexico. Journal of Mammalogy 61(4):724-725 [J. Alroy/J. Alroy/J. Alroy] | |
23536 | J. J. Flynn, B. J. Kowallis, C. Nuñez, O. Carranza-Castañeda, W. E. Miller, C. C. Swisher, III, and E. Lindsay. 2005. Geochronology of Hemphillian-Blancan aged strata, Guanajuato, Mexico, and implications for the timing of the Great American Biotic Interchange. Journal of Geology 113:287-307 [J. Alroy/J. Alroy/M. Uhen] | |
2596 | W. E. Miller and O. Carranza-Castaneda. 1998. Late Tertiary Canids from Central Mexico. Journal of Paleontology 72(3):546-556 [J. Alroy/J. Alroy/J. Marcot] | |
57305 | O. Mooser. 1958. Una zebra fosil de la Mesa Central de Mexico. Universidad Nacional Autónoma de México, Instituto de Biología, Anales 28:359-363 [J. Marcot/J. Marcot] | |
57306 | O. Mooser. 1959. Un equido fosil del genero Neohipparion de la Mesa Central de Mexico. Universidad Nacional Autónoma de México, Instituto de Biología, Anales 30:375-388 [J. Marcot/J. Marcot] | |
57307 | O. Mooser. 1963. Neohipparion monias n. sp. equido fosil del Plioceno de la Mesa Central de Mexico. Universidad Nacional Autónoma de México, Instituto de Biología, Anales 34:393-396 [J. Marcot/J. Marcot] | |
57311 | O. Mooser. 1964. Una Nueva Especie De Equido Del Genero Protohippus Del Plioceno Medio De La Mesa Central De Mexico. Universidad Nacional Autónoma de México, Instituto de Biología, Anales 35:157-158 [J. Marcot/J. Marcot] | |
6218 | D. R. Prothero. 1998. Rhinocerotidae. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary mammals of North America 595-605 [J. Alroy/J. Alroy/J. Alroy] | |
23543 | D. R. Ruez, Jr. 2005. Earliest record of Palaeolama (Mammalia, Camelidae) with comments on "Palaeolama" guanajuatensis. Journal of Vertebrate Paleontology 25(3):741-744 [J. Alroy/J. Alroy] |