Large theropod and small sauropod trackmakers from the Lower Cretaceous Jingchuan Formation, Inner Mongolia, China

Lockley, Martin G.; Li, Jianjun; Xing, Lida; Guo, Bin; Matsukawa, Masaki

doi:10.1016/j.cretres.2018.07.007

Cited by 22 publications

(6 citation statements)

References 31 publications

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“…This feature (MTP II) also distinguishes type Eubrontes and E. nobatai from most other Eubrontes, from common ichnogenus (Xing et al 2009a(Xing et al , 2014b; (i) Eubrontes zigongensis (Xing et al 2014c); (j) Eubrontes platypus (Hitchcock 1858) Xiyang specimen (Yang and Yang 1987); (k) Eubrontes monax (Zhen et al 1986;Lockley et al 2013); (l) Eubrontes xiyangensis (Zhen et al 1986;Lockley et al 2013); (m) Changpeipus carbonicus (Xing et al 2014b); (n) Eubrontes nianpanshanensis (Xing et al 2016b); (o) Lufengopus dongi (Lü et al 2006;Xing et al 2014d); (p) Eubrontes (?) glenrosensis Hailiutu specimen (Li et al 2010;Xing et al 2021); (q) Lockleypus luanpingeris (Xing et al 2018e); (r) Chapus lockleyi ; (s) Asianopodus pulvinicalyx (Matsukawa et al 2005); (t) Asianopodus robustus (Li et al 2011;Lockley et al 2018);(u) Eubrontes nobitai (This study); (v) Eubrontes HX-T3 (Xing et al 2015b); (w) Eubrontes BJA-T4 (Xing et al 2016c) Kayentapus of the Early-Middle Jurassic (Lockley et al 2011;Xing et al 2020), and from such Cretaceous ichnogenera as Asianopodus (Fig. 6).…”

Section: Descriptionmentioning

confidence: 99%

The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

Xing

Lockley

Klein³

et al. 2021

J. Palaeogeogr.

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The Jiaguan Formation and the underlying Feitianshan Formation (Lower Cretaceous) in Sichuan Province yield multiple saurischian (theropod–sauropod) dominated ichnofaunas. To date, a moderate diversity of six theropod ichnogenera has been reported, but none of these have been identified at the ichnospecies level. Thus, many morphotypes have common “generic” labels such as Grallator, Eubrontes, cf. Eubrontes or even “Eubrontes-Megalosauripus” morphotype. These morphotypes are generally more typical of the Jurassic, whereas other more distinctive theropod tracks (Minisauripus and Velociraptorichnus) are restricted to the Cretaceous. The new ichnospecies Eubrontes nobitai ichnosp nov. is distinguished from Jurassic morphotypes based on a very well-preserved trackway and represents the first-named Eubrontes ichnospecies from the Cretaceous of Asia.

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Section: Descriptionmentioning

confidence: 99%

The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

Xing

Lockley

Klein³

et al. 2021

J. Palaeogeogr.

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“…As noted above, ichnogenus Gigandipus has only been reported once from the Cretaceous, from the Jiaguan Formation of Guizhou Province (Xing et al, 2018b). However, recently a large tetradactyl track, with prominent hallux traces was reported and named as Ordexallopus zhanglifui from the Lower Cretaceous Jingchuan Formation (Lockley et al, 2018). These authors compared this ichnotaxon with Gigandipus to demonstrated the difference notably in the much greater divarication angle of O. zhanglifui.…”

Section: Chongqingpus Nananensismentioning

confidence: 97%

A Review of two Middle Jurassic Theropod Tracksites Discovered in the 1980s from Sichuan Basin

Xing

Lockley

Peng³

et al. 2021

Biosis:Biol. Syst.

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Tracks from two sites in the Middle Jurassic Xintiangou Formation in the Wuma Village area, Wuhuang Township, Zizhong have been known and intermittently studied and excavated since the 1980s. The track-bearing surfaces were exposed by a combination of natural weathering and deliberate excavation by residents in a rural agricultural area. The surfaces were used as “threshing floors” for the processing of agricultural crops in an area subject to weathering under a humid sub-tropical climatic regime. Despite the negative effects of weathering on the quality of track preservation, the sites are historically significant in Chinese ichnology as the type areas for many controversially named theropod ichnotaxa. Subsequent researchers challenged the ichnotaxonomy as provincial and over-split, suggesting that many of the tracks, belong to well-known Lower Jurassic ichnogenera. The present study reviews these two sites, providing new information, and confirming that the tracks belong to the ichnogenera Grallator, Eubrontes and Kayentpus which are typical of the globally widespread Lower Jurassic tetrapod biochron. This suggests the Middle Jurassic ichnofauna in Sichuan is like Lower Jurassic ichnofaunas elsewhere. Previous efforts to transfer the ichnospecies to globally, better-known ichnogenera were important in reducing ichnogenus diversity, but did not reduce ichnosepcies diversity. Herein the ichnotaxa are reviewed and it is shown that the ichnospecies names have no utility for comparative study or in assessing assemblage diversity, or biochron composition. It is therefore proposed that the multiple ichnospecies names proposed based on tracks from these two localities can mostly be accommodated under the labels Grallator isp. indet., and Eubrontes isp. indet.

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“…proposed that the claws present in sauropods would act as traction devices, preventing the foot from sliding backwards during support and propulsion (Bonnan 2005). Among the smallest known sauropod manus and pes tracks are those documented by Lockley et al (2018) from the Lower Cretaceous Jingchuan Formation of China. The length and width of these sauropod manus tracks are 5.0 and 6.0 cm, respectively, and the length and width of pes tracks are 11.5 and 7.5 cm, respectively.…”

Section: Producermentioning

confidence: 99%

Unusual sauropod slipping tracks preserved on a biostabilized tidal flat from the Lower Cretaceous of northern Patagonia, Argentina

Heredia

Pazos

Fernández

2022

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Several elongated and other crescent-shaped impressions interpreted as dinosaur tracks and preserved on Lower Cretaceous tidal flat deposits from the Agrio Formation (northern Patagonia, Argentina) are studied in detail. These tracks were documented on a paleosurface showing paleotopographic differences over a short distance, related to the lateral migration of a tidal channel. A genetic order between biostabilization and bioturbation of the paleosurface is recognized. Ripples generated within the channel during the flood tide were first biostabilized; there, horseshoe crab trace fossils were produced. Then, the area bearing the tracks studied here was subaerially exposed, with the biostabilized substrate generating a slippery surface. Scanning electron microscope (SEM) analysis of the rims indicates that the microbial mat was disturbed by the trampling. Finally, microbial mats recovered, and some tracks preserve wrinkle marks inside the tracks. Taking into account the substrate properties and track features analized (morphology, size, depth, and orientation), it is concluded that the tracks were produced by dinosaurs, probably small sauropods, trampling on a slippery surface and moving parallel to the channel margin. This study is an unusual case of slipping tetrapod tracks preserved on a biostabilized tidal flat developed in a mixed carbonate-siliciclastic environment.

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Large theropod and small sauropod trackmakers from the Lower Cretaceous Jingchuan Formation, Inner Mongolia, China

Cited by 22 publications

References 31 publications

The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

A Review of two Middle Jurassic Theropod Tracksites Discovered in the 1980s from Sichuan Basin

Unusual sauropod slipping tracks preserved on a biostabilized tidal flat from the Lower Cretaceous of northern Patagonia, Argentina

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