Tio Gregorio: Late Miocene, Venezuela

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Caiman brevirostris Souza Filho 1987
Scheyer et al. 2013
AMU-CURS-105 (cranium) and AMU-CURS-106 (mandible)
    = Caimaninae indet. Brochu 1999
Scheyer and Delfino 2016
Purussaurus mirandai Aguilera et al. 2006
Aguilera et al. 2006
MCC URU-157-72V (dentary), AMU-CURS-33 (isolated posterior tooth)
Purussaurus cf. mirandai Aguilera et al. 2006
Scheyer and Delfino 2016
AMU-CURS-57 (mandible)
Mourasuchus sp. Price 1964
Scheyer et al. 2013
AMU-CURS-073 (right mandible and incomplete rostrum and postcranial material) and AMU-CURS-695
Gryposuchus croizati Riff and Aguilera 2008
Riff and Aguilera 2008
AMU-CURS-58 (isolated skull)
Ikanogavialis gameroi n. gen., n. sp. Sill 1970
Sill 1970
UCV-VF-1165 & 1166 - holotype (cranium and mandible); referred material: MCN-URU-2002-143 (cranium and mandible)
Reptilia - Testudines - Podocnemididae
Bairdemys sanchezi n. sp. Gaffney et al. 2008
Gaffney et al. 2008
AMU-CURS 186, Skull, jaws, and anterior plastral fragment
Mammalia - Rodentia - Neoepiblemidae
Horovitz et al. 2006
UNEFM-VF-020. Body mass estimates of 741Kg using the Femur.
Phoberomys cf. pattersoni Bondesio and Bocquentin Villanueva 1988
Horovitz et al. 2006
UNEFM-VF-026
Actinopteri - Siluriformes - Pimelodidae
Phractocephalus nassi Lundberg and Aguilera 2003
UNEFM-PF-0365 (paratype); UNEFM-PF-0366 (non-type); MCC-URU-2002-141, UNEFM-PF-0159 (non-types)
see common names

Geography
Country:Venezuela State/province:Falcon
Coordinates: 11.2° North, 70.3° West (view map)
Paleocoordinates:11.0° North, 68.9° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 6
Key time interval: Late Miocene
Age range of interval: 11.63 - 5.333 m.y. ago
Stratigraphy
Formation:Urumaco Member:Upper
Stratigraphic resolution:member
Stratigraphy comments: The geological units from which the specimens were obtained are the middle and upper members of the Urumaco Formation of Venezuela. These units have been recently summarized in the Léxico estratigráfico de Venezuela (1997).

Horovitz, et al. 2006: with strata located at the top of the Urumaco sequence and close stratigraphically to the overlying Codore Formation
Lithology and environment
Primary lithology:brown,gray claystone
Includes fossils?Y
Lithology description: The upper member of the Urumaco Formation also comprises gray to brown often limey claystone with thin intercalated and locally conchiferous sandstones. The uppermost layer is referred to as the “capa de tortugas” because of its abundant remains of the turtle Bairdemys Gaffney & Wood. Several localities and levels have concentra- tions of vertebrate fossils. The vertebrate fauna includes marine, estuarine and freshwater fishes, terrestrial, freshwater and marine turtles and crocodilians, and terrestrial and aquatic/semiaquatic mammals (Sánchez-Villagra et al., 2003).
Environment:fluvial-deltaic indet.
Geology comments: The paleoenvironments were tropical near shore marine to low coastal savannas with freshwater rivers.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Also known as:Urumaco
Database number:136776
Authorizer:C. Jaramillo, P. Mannion, E. Vlachos Enterer:G. Ballen, M. Kouvari, E. Vlachos, P. Mannion, J. Carrillo
Modifier:M. Kouvari Research group:vertebrate
Created:2012-12-04 10:51:46 Last modified:2019-08-29 03:20:27
Access level:the public Released:2012-12-04 10:51:46
Creative Commons license:CC BY
Reference information

Primary reference:
43734. J. G. Lundberg and O. A. Aguilera. 2003. The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species. Neotropical Ichthyology 1(2):97-109 [C. Jaramillo/G. Ballen]

Secondary references:

46438 O. A. Aguilera, D. Riff, and J. Bocquentin-Villanueva. 2006. A new giant Purussaurus (Crocodyliformes, Alligatoridae) from the Upper Miocene Urumaco Formation, Venezuela. Journal of Systematic Palaeontology 4(3):221-232 [P. Mannion/P. Mannion]
64062 E. S. Gaffney, T. M. Scheyer, K. G. Johnson, J. Bocquetin, and O. A. Aguilera. 2008. Two new species of the side necked turtle genus, Bairdemys (Pleurodira, Podocnemididae), from the Miocene of Venezuela. Palaeontologische Zeitschrift 82(2):209-229 [E. Vlachos/E. Vlachos]
69912 I. Horovitz, M. R. Sánchez-Villagra, T. Martin and O. A. Aguilera. 2006. The fossil record of Phoberomys pattersoni Mones 1980 (Mammalia, Rodentia) from Urumaco (Late Miocene, Venezuela), with an analysis of its phylogenetic relationships. Journal of Systematic Palaeontology 4(3):293-306 [P. Mannion/M. Kouvari]
46508 D. Riff and O. A. Aguilera. 2008. The world's largest gharials Gryposuchus: description of G. croizati n. sp. (Crocodylia, Gavialidae) from the Upper Miocene Urumaco Formation, Venezuela. Paläontologische Zeitschrift 82(2):178-195 [P. Mannion/P. Mannion]
46999 M. R. Sanchez-Villagra, O. Aguilera, and I. Horovitz. 2003. The anatomy of the world's largest extinct rodent. Science 301(5640):1708-1710 [C. Jaramillo/C. Suarez-Gomez]
47517 T. M. Scheyer, O. A. Aguilera, M. Delfino, D. C. Fortier, A. A. Carlini, R. Sánchez, J. D. Carrillo-Briceño, L. Quiroz, and M. R. Sánchez-Villagra. 2013. Crocodylian diversity peak and extinction in the late Cenozoic of the northern Neotropics. Nature Communications 4:1907:1-9 [P. Mannion/P. Mannion/P. Mannion]
61076 T. M. Scheyer and M. Delfino. 2016. The late Miocene caimanine fauna (Crocodylia: Alligatoroidea) of the Urumaco Formation, Venezuela. Palaeontologia Electronica 19(3):48A:1-57 [P. Mannion/P. Mannion]
47637 W. D. Sill. 1970. Nota preliminar sobre un nuevo gavial del Plioceno de Venezuela y una discusion de los gaviales Sudamericanos. Ameghiniana 7(2):151-159 [P. Mannion/P. Mannion]