Where: Omnogov Aimak, Mongolia (43.7° N, 100.9° E: paleocoordinates 40.9° N, 90.2° E)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Djadokhta Formation, Late/Upper Campanian (83.5 - 70.6 Ma)
• Age is not well constrained for the Djadokhta Formation (Clark et al. 2001). "Fossil vertebrate sites occur in the uppermost 65 m of a section..." see Fig. 1b, Dashzeveg et al. (1995).
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•Dashzeveg et al. 2005: The quick stratigraphic succession of normal and reversed magnetozones suggests, but does not clearly establish, that the sediments may have been deposited during the rapid sequence of polarity changes in the late part of the Campanian between about 75 to 71 Ma.
Environment/lithology: eolian; fine-grained, coarse, red, silty sandstone and mudstone
Size classes: macrofossils, mesofossils
Collected in 1992-1996
Collection methods: surface (float), surface (in situ),
• Institute of Geology, Mongolia
Primary reference: D. Dashzeveg, M. J. Novacek, M.A. Norell, J.M. Clark, L.M. Chiappe, A. Davidson, M.C. McKenna, L. Dingus, C. Swisher and P. Altangerel. 1995. Extraordinary preservation in a new vertebrate assemblage from the Late Cretaceous of Mongolia. Nature 374:446-449 [A. Behrensmeyer/A. Behrensmeyer/R. Whatley]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 37184: authorized by John Alroy, entered by Robin Whatley on 03.03.2004, edited by Matthew Carrano, Philip Mannion, Roger Benson and John Alroy
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
Estesia mongoliensis Norell et al. 1992 squamates IGM 3/169 (a skull with mandible, preserved three-dimensionally) and IGM 3/760 (partial axial skeletons including dorsal vertebrae with articulating ribs and an incomplete left forelimb)
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Shinisauroides latipalatum Borsuk-Bialynicka 1985 squamates | |
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Saichangurvel davidsoni n. gen. n. sp.3 Conrad and Norell 2007 squamates IGM 3/858 (holotype skeleton)
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Hymenosaurus clarki n. gen. n. sp.5, Myrmecodaptria microphagosa n. gen. n. sp.5, Parmeosaurus scutatus n. gen. n. sp.5, Carusia intermedia4, Globaura venusta5
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Carnosauria indet. carnosaur | |
Velociraptor mongoliensis Osborn 1924 maniraptoran | |
Aves | |
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Reptilia | |
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Shuvuuia deserti n. gen. n. sp.2
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Bagaceratops sp. Maryanska and Osmólska 1975 ceratopsian | |
Ankylosauridae indet. Brown 1908 ankylosaurid | |
Shamosuchus djadochtaensis8 Mook 1924 crocodilian IGM 100/1195 (nearly complete skull, lower jaws, and associated postcranial remains including; all eight cervical vertebrae with three right cervical ribs (c5–c7) and one left cervical rib (c8), dorsal vertebrae d1 through d3 with four right dorsal ribs (d1–d3) and three left dorsal ribs (d2?–d6?), five anterior caudal vertebrae and two haemal arches, a complete right humerus, the distal half of the left humerus, the proximal portion of the right radius, a complete left radius in association with the left humerus, a complete left ulna, a fragmentary right ischium, a partial right femur consisting of a damaged diaphysis and distal condyle, a complete right tibia, a nearly complete left tibia, a complete right fibula, a partial left fibula, and a single left metatarsal and phalanx)
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? Basilemys sp. Hay 1902 turtle | |
Mammalia | |
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Zalambdalestes lechei Gregory and Simpson 1926 eutherian | |
cf. Hyotheridium sp. Gregory and Simpson 1926 eutherian | |
Kennalestes cf. gobiensis Kielan-Jaworowska 1968 eutherian | |
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Catopsbaatar sp. Kielan-Jaworowska 1994 multituberculate This is a typo? "Catopsbaatar Catopsaloides"
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Nemegtbaatar gobiensis Kielan-Jaworowska 1974 multituberculate | |
Kamptobaatar cf. kuczynskii Kielan-Jaworowska 1969 multituberculate
Sloanbaatar cf. mirabilis Kielan-Jaworowska 1969 multituberculate | |
Chulsanbaatar cf. vulgaris Kielan-Jaworowska 1974 multituberculate |