Paleomagnetic and palynologic analyses of Albian to Santonian strata at Bayn Shireh, Burkhant, and Khuren Dukh, eastern Gobi Desert, Mongolia

Hicks, Jason F.; Brinkman, DB; Nichols, Douglas J.; Watabe, Mahito

doi:10.1006/cres.1999.0188

Cited by 51 publications

(30 citation statements)

References 25 publications

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“…Acrotholus also predates the well-known series of Asian pachycephalosaurs, including the flat-headed taxa Goyocephale and Homalocephale 16,37 . Watabe et al 23 recently described the oldest unequivocal pachycephalosaur from Asia based on a frontoparietal from the upper Bayn Shireh Formation of Mongolia, which has been suggested to be Santonian in age 38 , approximately equivalent in age to Acrotholus.…”

Section: Discussionmentioning

confidence: 99%

The oldest North American pachycephalosaurid and the hidden diversity of small-bodied ornithischian dinosaurs

et al. 2013

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Taphonomic biases dictate how organisms are represented in the fossil record, but their effect on studies of vertebrate diversity dynamics is poorly studied. In contrast to the high diversity and abundance of small-bodied animals in extant ecosystems, small-bodied dinosaurs are less common than their large-bodied counterparts, but it is unclear whether this reflects unique properties of dinosaurian ecosystems or relates to taphonomic biases. A new, fully domed pachycephalosaurid dinosaur, Acrotholus audeti, from the Santonian of Alberta predates incompletely domed taxa, and provides important new information on pachycephalosaur evolution and the completeness of the ornithischian fossil record. Here we provide the first empirical evidence that the diversity of small-bodied ornithischian dinosaurs is strongly underestimated based on ghost lineages and the high proportion of robust and diagnostic frontoparietal domes compared with other pachycephalosaur fossils. This suggests preservational biases have a confounding role in attempts to decipher vertebrate palaeoecology and diversity dynamics through the Mesozoic.

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Section: Discussionmentioning

confidence: 99%

The oldest North American pachycephalosaurid and the hidden diversity of small-bodied ornithischian dinosaurs

et al. 2013

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“…Although mid-caudal vertebrae of Garudimimus are unknown, those of other ornithomimosaurs do not exhibit a ventral midline keel or keel-like anatomy, so this trait could represent a possible synapomorphy uniting Beishanlong and Harpymimus as sister taxa. Both species are considered to be of Aptian-Albian age (Hicks et al 1999;Tang et al 2001).…”

Section: Discussionmentioning

confidence: 99%

A giant ornithomimosaur from the Early Cretaceous of China

Makovicky

Gao³

et al. 2009

Proc. R. Soc. B.

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Ornithomimosaurs (ostrich-mimic dinosaurs) are a common element of some Cretaceous dinosaur assemblages of Asia and North America. Here, we describe a new species of ornithomimosaur, Beishanlong grandis, from an associated, partial postcranial skeleton from the Aptian-Albian Xinminpu Group of northern Gansu, China. Beishanlong is similar to another Aptian-Albian ornithomimosaur, Harpymimus, with which it shares a phylogenetic position as more derived than the Barremian Shenzhousaurus and as sister to a Late Cretaceous clade composed of Garudimimus and the Ornithomimidae. Beishanlong is one of the largest definitive ornithomimosaurs yet described, though histological analysis shows that the holotype individual was still growing at its death. Together with the co-eval and sympatric therizinosaur Suzhousaurus and the oviraptorosaur Gigantraptor, Beishanlong provides evidence for the parallel evolution of gigantism in separate lineages of beaked and possibly herbivorous coelurosaurs within a short time span in Central Asia.

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“…Jerzykiewicz (2000) considered the Bayanshiree Formation to be late CenomanianÀConiacian to ?early Santonian in age. A magnetostratigraphical and palynological analysis of the sediments at Bayan Shiree suggests that they were deposited during the Cretaceous Long Normal interval (Chron 34n), from the Cenomanian to no later than the latest Santonian (Hicks et al 1999).…”

Section: Status Validmentioning

confidence: 99%