La Rinconada: Late/Upper Hemphillian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Proboscidea - Gomphotheriidae
? Rhynchotherium sp. Falconer 1868
compared to R. edensis
Mammalia - Lagomorpha - Leporidae
Notolagus velox Wilson 1937
Miller and Carranza-Castaneda 1998
Mammalia - Carnivora - Ursidae
Agriotherium cf. schneideri Sellards 1916
recombined as Huracan schneideri
described by Miller and Carranza 1996 (6 measurements)
Mammalia - Carnivora - Mustelidae
Taxidea sp. Waterhouse 1839
Carranza-Castaneda et al. 2013
Taxidea mexicana Drescher 1939
Carranza-Castaneda et al. 2013
Mammalia - Carnivora - Felidae
? Pseudaelurus intrepidus (Leidy 1858)
Carranza-Castaneda et al. 2013
Machairodus sp. Kaup 1833
(1 measurement)
    = Machairodus cf. coloradensis Cook 1922
Carranza-Castaneda and Miller 1996
    = Amphimachairodus alvarezi n. sp. Ruiz-Ramoni et al. 2019
Ruiz-Ramoni et al. 2019
IGM 6414 and 6415 - holotype
Mammalia - Carnivora - Canidae
Osteoborus cf. cyonoides (Martin 1928)
    = Borophagus secundus VanderHoof 1931
Alroy 2002
described by Miller and Carranza 1998a; confirmed by Wang et al. 1999
Mammalia - Antilocapridae
Texoceros sp. Frick 1937
Carranza-Castaneda et al. 2013
Antilocapridae indet. Gray 1866
    = Hexobelomeryx cf. fricki Furlong 1941
Miller and Carranza-Castaneda 1998
replaces ID of Miller and Carranza 1996
Mammalia - Tayassuidae
Prosthennops sp. Matthew and Gidley 1904
    = Tayassuinae indet. Palmer 1897
Alroy 2002
based on comparisons with Colbert 1939, no mention of D. Wright's work
Catagonus brachydontus (Dalquest and Mooser 1980)
Carranza-Castaneda et al. 2013
recombined as Protherohyus brachydontus
Mammalia - Camelidae
Megatylopus sp. (Matthew and Cook 1909)
    = Megatylopus cf. matthewi Webb 1965
Miller and Carranza-Castaneda 1998
Alforjas sp. Harrison 1979
Carranza-Castaneda et al. 2013
Hemiauchenia sp. Gervais and Ameghino 1880
    = Hemiauchenia vera Matthew 1909
Miller and Carranza-Castaneda 1998
recombined as Pleiolama vera
Mammalia - Perissodactyla - Equidae
Dinohippus mexicanus (Lance 1950)
original and current combination Pliohippus (Pliohippus) mexicanus
Astrohippus stockii (Lance 1950)
original and current combination Pliohippus (Astrohippus) stockii
Neohipparion eurystyle (Cope 1893)
Nannippus minor (Sellards 1916)
    = Nannippus aztecus Mooser 1968
Miller and Carranza-Castaneda 1998
Mammalia - Perissodactyla - Rhinocerotidae
Teleoceras fossiger (Cope 1878)
    = Teleoceras sp. Hatcher 1894
Miller and Carranza-Castaneda 1998
see common names

Geography
Country:Mexico State/province:Guanajuato
Coordinates: 21.1° North, 100.8° West (view map)
Paleocoordinates:21.4° North, 99.2° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
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:9.40000 - 4.70000 m.y. ago
Age estimate:4.4 ± 0.3 Ma (fission track)
* legacy (obsolete) database fields
Stratigraphy
Formation:Rancho Viejo Beds
Local section:La Rinconada Local bed:1
Stratigraphic resolution:group of beds
Stratigraphy comments: said to be late Hemphillian
most material is from a 2 m interval
immediately underlies a fission track on zircon date of 4.4 +/- 0.3 Ma (Flynn et al. 2005)
Lithology and environment
Primary lithology: not reported
Environment:fluvial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Also known as:GTO-43
Database number:18740
Authorizer:J. Alroy, P. Mannion Enterer:J. Alroy, P. Mannion
Modifier:P. Mannion Research group:vertebrate
Created:1997-04-12 00:00:00 Last modified:2020-08-11 08:08:29
Access level:the public Released:1997-04-12 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
1176.5% 54420O. Carranza-Castaneda. 1992. Una nueva localidad del henfiliano tardio en la mesa central de Mexico. Revista Mexicana de Ciencias Geologicas 10(2):179-196 [J. Alroy/J. Alroy/J. Alroy]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
51759 O. Carranza-Castaneda, J. J. Aranda-Gómez, X. Wang and A. Iriondo. 2013. The Early-Late Hemphillian (Hh2) Faunal Assemblage From Juchipila Basin, State of Zacatecas, Mexico, and Its Biochronologic Correlation with Other Hemphillian Faunas in Central Mexico. Contributions to Science, Natural History Museum of Los Angeles County 521:13-49 [J. Marcot/J. Marcot/P. Mannion]
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]
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]
73354 D. Ruiz-Ramoni, A. D. Rincón, and M. Montellano-Ballesteros. 2019. Taxonomic revision of a Machairodontinae (Felidae) from the Late Hemphillian of México. Historical Biology [P. Mannion/P. Mannion]