Also known as Pajchapata
Where: Cochabamba, Bolivia (17.7° S, 65.9° W: paleocoordinates 20.2° S, 52.0° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Lower Member (El Molino Formation), Late/Upper Maastrichtian (70.6 - 66.0 Ma)
• The fossils described in this paper occur about 30 m above the base of the El Molino Formation. This is in the base of the upper part of the Lower Member of the El Molino Formation
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•Based on a detailed study of the magnetostratigraphy of the El Molino Formation at the La Palca stratotype section near Potosı́, and applying sequence stratigraphic methods for correlating with the Pajcha Pata section, the fossil bed is ≈68.4 Ma (Sempere et al., 1997, following the time scale of [Cande and Kent, 1992] and [Cande and Kent, 1995]).
• bed-level stratigraphic resolution
Environment/lithology: estuary or bay; fine-grained, medium, red, yellow sandstone
Size classes: macrofossils, mesofossils
Collected by Marshall, Gayet and Meunier in 1989, 1994
Collection methods: bulk, surface (float), sieve,
• Museo de Historia Natural de Cochabamba, Cochabamba, Bolivia (MHNC) collection
Primary reference: M. Gayet, L. G. Marshall, T. Sempere, F. J. Meunier, H. Capetta and J. Rage. 2001. Middle Maastrichtian vertebrates (fishes, amphibians, dinosaurs and other reptiles, mammals) from Pajcha Pata (Bolivia). Biostratigraphic, palaeoecologic and palaeobiogeographic implications. Palaeogeography, Palaeoclimatology, Palaeoecology 169(1-2):39-68 [R. Benson/R. Benson]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 12855: authorized by Emmanuel Fara, entered by Emmanuel Fara on 20.12.2001, edited by Roger Benson, Matthew Carrano and Gustavo Ballen
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
? Dryolestoidea "indet. 1", Latinopollia suarezi, Lepidotyle enigmatica, Phaerodusichthys taverni, Serrasalminae "indet. 1", Serrasalminae "indet. 2", Serrasalminae "indet. 3", Arioida "new genus", Santosius sp.
? Dryolestoidea "indet. 1" 1 upper right molar: The overall molar morphology is consistent with a tribosphenic mammal, while dryolestoid affinities are suggested; "Mammalia gen. et sp. indet. 1"
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Osteichthyes | |
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Lepidosiren cf. paradoxa1 Fitzinger 1837 South American lungfish 3 pterygoid, 1 prearticular tooth plates
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Mammalia | |
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Dryolestidae sp.3 Marsh 1879 mammal 1 upper right molar: The overall molar morphology is consistent with a tribosphenic mammal, while dryolestoid affinities are suggested; "Mammalia gen. et sp. indet. 1"
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Eutheria sp.3 Huxley 1880 eutherian fragment of an upper molar: This specimen is tentatively regarded as a non-tribosphenid therian largely by exclusion from other groups as well as showing clear evidence of cusp structure. "Mammalia gen. et sp. indet. 3"
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Reptilia | |
"Podocnemidae indet." = Podocnemididae
"Podocnemidae indet." = Podocnemididae Cope 1868 sideneck turtle | |
? Madtsoiidae indet. Hoffstetter 1961 snake | |
Abelisauridae indet.2 Bonaparte and Novas 1985 ceratosaur 1 tooth (MHNC-3702); numerous tooth fragments
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Amphibia | |
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Noterpeton bolivianum n. gen. n. sp.4
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Cladistia | |
Dagetella sudamericana Gayet and Meuniere 1992 bichir isolated scales, neurocranial elements, spines of finlets, and vertebrae
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Actinopteri | |
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cf. Cyprinodontiformes indet.1 Bertin 1958 | |
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Gasteroclupea branisai1 Signeux 1964 | |
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Chondrichthyes | |
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