List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Fictovichnus sciuttoi
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3 specimens | |||||||||
| UMPLIC 004 to UMPLIC 006, three moulds. | ||||||||||
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Mammalia
- Carnivora
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Caniformia informal sp. 1
Kretzoi 1943
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Caniformia informal sp. 2
Kretzoi 1943
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Mammalia
- Carnivora
- Amphicyonidae
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Mammacyon sp.
Loomis 1936
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Ortiz-Caballero et al. 2020 | |||||||||
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Mammalia
- Carnivora
- Canidae
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Cormocyon sp.
Wang and Tedford 1992
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Ortiz-Caballero et al. 2020 | |||||||||
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Mammalia
- Camelidae
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Poebrotherium sp.
Leidy 1847
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1 specimen | |||||||||
| UMPE 0037, mandible fragment with m1em3 | ||||||||||
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Mammalia
- Merycoidodontidae
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Oreodontoides sp.
(Thorpe 1921)
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Ortiz-Caballero et al. 2020 | |||||||||
| original and current combination Eporeodon (Oreodontoides) | ||||||||||
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Merycoidodon sp.
Leidy 1848
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1 specimen | |||||||||
| UMPE 0610, skull fragment | ||||||||||
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Mammalia
- Leptochoeridae
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Leptochoerus sp.
Leidy 1856
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2 specimens | |||||||||
| UMPE 0175 M1eM2; UMPE 0570 mandible fragment with p3-m3. | ||||||||||
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Mammalia
- Tayassuidae
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Perchoerus probus
(Leidy 1856)
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2 specimens | |||||||||
| UMPE 0031, mandible fragment with m2em3. UMPE 0442, upper canine. | ||||||||||
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Mammalia
- Hypertragulidae
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Nanotragulus sp.
Lull 1922
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3 specimens | |||||||||
| UMPE 0609, mandible fragment with p4-m3; UMPE 192, M3; UMPE 0086, astragalus | ||||||||||
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Mammalia
- Protoceratidae
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Protoceratidae indet.
Marsh 1891
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1 specimen | |||||||||
| UMPE 0283, P4-M2. | ||||||||||
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Mammalia
- Perissodactyla
- Chalicotheriidae
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Chalicotheriidae indet.
Gill 1872
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1 specimen | |||||||||
| UMPE 0042, mandible fragment with dp3 and dp4 talonid. | ||||||||||
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Mammalia
- Perissodactyla
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Tapiroidea indet.
Gill 1872
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Mammalia
- Perissodactyla
- Rhinocerotidae
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Subhyracodon sp.
Wood 1927
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Ortiz-Caballero et al. 2020 | |||||||||
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Trigonias sp.
Lucas 1900
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1 specimen | |||||||||
| UMPE 0624, left m2 and m3. | ||||||||||
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Mammalia
- Perissodactyla
- Amynodontidae
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cf. Amynodontopsis sp.
Stock 1933
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1 specimen | |||||||||
| UMPE 0623, mandible fragment with p4 and roots of m1em3. | ||||||||||
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Mammalia
- Perissodactyla
- Equidae
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Miohippus assinoboiensis
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1 specimen | |||||||||
| UMPE 0612, mandible fragment with p4-m3. | ||||||||||
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Mammalia
- Erinaceidae
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Dzavui landeri n. gen., n. sp.
Jiménez-Hidalgo et al. 2022
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Jiménez-Hidalgo et al. 2022 | |||||||||
| Holotype: UMPE 945, left dentary fragment preserving the alveolus of the p3, and the p4 and m1 | ||||||||||
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Mammalia
- Lagomorpha
- Leporidae
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Archaeolagus sp.
Dice 1917
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Ortiz-Caballero et al. 2020 | |||||||||
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Mammalia
- Rodentia
- Geomyidae
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Geomyinae indet.
Bonaparte 1845
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1 specimen | |||||||||
| UMPE 0116, mandible fragment with dp4-m1. | ||||||||||
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Mammalia
- Rodentia
- Sciuridae
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Sciuridae indet.
Gray 1821
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Mammalia
- Rodentia
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aff. Jimomys sp.
Wahlert 1976
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1 specimen | |||||||||
| "Aff. Jimomys nov." UMPE 0316, mandible fragment with p3 alveolus and p4-m2. | ||||||||||
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Mammalia
- Rodentia
- Entoptychidae
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Gregorymys sp.
Wood 1936
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2 specimens | |||||||||
| UMPE 0156, skull fragment with P4-M3. UMPE 0178, mandible fragment with p4-m3. | ||||||||||
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= Gregorymys veloxikua n. sp.
Jimenez-Hidalgo et al. 2018
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Jimenez-Hidalgo et al. 2018 | |||||||||
| UMPE 626 - holotype (almost complete skull with an associated mandible with teeth) | ||||||||||
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Gregorymys mixtecorum n. sp.
Ortiz-Caballero et al. 2020
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Ortiz-Caballero et al. 2020 | |||||||||
| UMPE 260 - type | ||||||||||
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Reptilia
- Rhineuridae
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Rhineura sp.
Cope 1861
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1 specimen | |||||||||
| UMPE 0281, partial skull | ||||||||||
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Reptilia
- Testudines
- Testudinidae
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Stylemys sp.
Leidy 1851
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1 specimen | |||||||||
| UMPE 0341, several plastron elements | ||||||||||
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= aff. Stylemys gisellae n. sp.
Carbot-Chanona et al. 2022
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Carbot-Chanona et al. 2022 | |||||||||
| UMPE 443, an almost complete carapace with a relatively good preservation and a poorly preserved plastron. | ||||||||||
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Reptilia
- Testudines
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aff. Hadrianus sp.
Cope 1872
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Celliformidae
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Celliforma curvata
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3 specimens | |||||||||
| UMPLIC 001 to UMPLIC 003, three internal moulds | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Oaxaca |
| Coordinates: | 17.5° North, 97.6° West (view map) | ||
| Paleocoordinates: | 18.4° North, 91.1° West | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | local area |
Stratigraphy
| Formation: | Yolomécatl | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Originally thought to be middle or late Eocene and described as the Yolomécatl Formation (Ferrusquia-Villafranca et al. 2018), a new U-Pb zircon maximum depositional age of 30.6 ± 0.77 Ma for a sandstone bed that is within the fossiliferous beds indicates an Arikareean 1 North American Land Mammal Age (NALMA) and it has been assigned to the Chilapa Formation instead (Guerrero-Arenas et al., 2020; see Ortiz-Caballero et al. 2020). However, Ferrusquía-Villafranca and Wang (2021) have argued that it is the Yolomécatl Formation, providing a 40Ar-39Ar age of 40.3 ± 1.0 Ma (latest Uintan-earliest Duchesnean NALMA)
A corrected Ar–Ar age of 27.829 ± 0.716 Ma for the San Marcos Andesite, which overlies the Chilapa/Yolomécatl Formation close to the Yolomécatl fossiliferous beds, indicate an early Oligocene age for the formation (Guerrero-Arenas et al. 2020; Jiménez-Hidalgo et al. 2021). | |||||
Lithology and environment
| Primary lithology: | mudstone |
| Secondary lithology: | chert |
| Includes fossils? | Y |
| Lithology description: " ... a sequence of about 200 m in thickness of thinly to thickly bedded mudstones with occasional coarse lenses and some beds of volcanic and limestone pebble, cobble and some boulder clasts, and unlike the Yanhuitlan Formation in all other areas, paleosols horizons are abundant. Some thinly bedded chert layers are also intercalated with the fine-grained strata. The beds of the Yolomecatl unit are much thicker (around 1 m or more) than those of the typical Yanhuitlan, showing a bimodal grain-size distribution, with minor pebble content." | |
| Environment: | fluvial-lacustrine indet. |
Taphonomy
| Modes of preservation: | body,trace |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: Specimens reposited in the Coleccion Científica del Laboratorio de Paleobiología, campus Puerto Escondido, Universidad del Mar under the acronyms UMPE for vertebrates and UMPLIC for ichnofossils. | |
Metadata
| Also known as: | Yolomécatl, Inyoo, Tortugota | ||
| Database number: | 166797 | ||
| Authorizer: | P. Holroyd, P. Mannion, C. Boyd, E. Vlachos | Enterer: | P. Holroyd, P. Mannion, E. Vlachos, C. Boyd, G. Varnham |
| Modifier: | E. Vlachos | Research group: | vertebrate |
| Created: | 2015-02-26 17:16:25 | Last modified: | 2022-09-04 11:09:49 |
| Access level: | the public | Released: | 2015-02-26 17:16:25 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 54482. | E. Jiménez-Hidalgo, K. T. Smith, R. Guerrero-Arenas and J. Alvarado-Ortega. 2015. The first Late Eocene continental faunal assemblage from tropical North America. Journal of South American Earth Sciences 57:39-48 [P. Holroyd/P. Holroyd/P. Mannion] |
Secondary references:
| 82535 | G. Carbot-Chanona, E. Jiménez-Hidalgo, J. A. Díaz-Cruz, G. Rivera-Velázquez, and V. H. Reynoso. 2022. A new large tortoise from the early Oligocene (Arikareean NALMA) of Oaxaca, southern Mexico and its phylogenetic position within Pan-Testudinidae. Historical Biology 1-14 [E. Vlachos/E. Vlachos] | |
| 67358 | I. Ferrusquia-Villafranca, L. J. Flynn, J. E. Ruiz-Gonzalez, J. R. Torres-Hernandez, and E. Martinez-Hernandez. 2018. New Eocene rodents from Northwestern Oaxaca, Southeastern Mexico, and their paleobiological significance. Journal of Vertebrate Paleontology e1514615 [P. Mannion/P. Mannion] | |
| 75872 | I. Ferrusquía-Villafranca and X. Wang. 2021. The first Paleogene mustelid (mammalia, Carnivora) from southern North America and its paleontologic significance. Journal of South American Earth Sciences 103236 [P. Mannion/P. Mannion] | |
| 67880 | E. Jimenez-Hidalgo, R. Guerrero-Arenas, and K. T. Smith. 2018. Gregorymys veloxikua, the oldest pocket gopher (Rodentia: Geomyidae), and the early diversification of Geomyoidea . Journal of Mammalian Evolution 25:427-439 [C. Boyd/C. Boyd] | |
| 81726 | E. Jiménez-Hidalgo, R. Guerrero-Arenas, and V. D. Crespo. 2022. First galericine erinaceid (Mammalia: Eulipotyphla) from the early Oligocene of tropical North America. Historical Biology [P. Mannion/G. Varnham] | |
| 73784 | E. Ortiz-Caballero, E. Jiménez-Hidalgo, and V. M. Bravo-Cuevas. 2020. A new species of the gopher Gregorymys (Rodentia, Geomyidae) from the early Oligocene (Arikareean 1) of southern Mexico. Journal of Paleontology [P. Mannion/P. Mannion] |