Jiangjunding Formation

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Jiangjunding Formation
Stratigraphic range: Campanian-Maastrichtian
~72.9–68.5  Ma
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S
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Type Group
Unit of Wangshi Group
Underlies Jingangkou Formation
Overlies Hongtuya Formation
Lithology
Primary Conglomerate, sandstone, siltstone
Other Marl
Location
Coordinates 36°54′N120°42′E / 36.9°N 120.7°E / 36.9; 120.7
Approximate paleocoordinates 37°18′N111°00′E / 37.3°N 111.0°E / 37.3; 111.0
Region Shandong
Country China
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Jiangjunding Formation (China)
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Jiangjunding Formation (Shandong)

The Jiangjunding Formation is a geological formation in Shandong, China whose strata date back to the Campanian-Maastrichtian stages of the Late Cretaceous. [1] Dinosaur remains are among the fossils that have been recovered from the group. [2]

Contents

The Jiangjunding formation consists purpley-grey or reddy-brown sandstones or various consistencies, siltstones and conglomerates. The Jiangjunding Formation was deposited in a fluvial to lacustrine environment. The climate was warm and humid during the majority of the timespan, although it was beginning to dry out after the Jiangjunding. [3]

Paleofauna

Dinosaur eggs are known from this formation. [4]

Paleofauna of the Jiangjunding Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Cheloniidae aff. Nanhsiungchelyidae [5] Indeterminate [6]
Coelurosauria indet. [5] Indeterminate [6]
Micropachycephalosaurus [7] M. hongtuyanensis [7] "Partial mandible, associated postcranial fragments." [5]
Micropachycephalosaurus.jpg
Pinacosaurus [8] P. cf. grangeri [8]
Pinacosaurus Jack Wood 2017.png
Sauropoda indet. [5] Indeterminate [5]
Shantungosaurus [6] S. giganteus [6] Xingezhuang Formation
Shantungosaurus life.png
Tanius [6] T. sinensis [6] Tanius.jpg

Age of the formation

The Wangshi group of geologic formations is generally considered to be from the Late Cretaceous, although some regions are older. Based on the discovery of Pinacosaurus , only known elsewhere in the Djadokhta Formation or regions of the same age, the Wangshi Group was presumed to be a similar age of 75–71 million years old. The specific age for the Hongtuya Formation has been identified as 73.5–72.9 mya. As the Hongtuya is directly older than the Jiangjunding, it was identified that the Jiangjunding must be of latest Campanian to earliest Maastrichtian age, according to Borinder (2015). [3]

References

  1. ↑ Wangshi Group in the Paleobiology Database
  2. ↑ Weishampel et al., 2004, pp.593–600
  3. 1 2 Borinder, N.H. (2015). Postcranial Anatomy of Tanius Sinensis Wiman, 1929 (Dinosauria; Hadrosauroidea) (PDF) (Report). Examensarbete vid Institutionen för geovetenskaper. Uppsala University. ISSN   1650-6553.
  4. ↑ Zhang, J.L.; Wang, Q; Jiang, S.X.; Cheng, X.; Li, N.; Qiu, R.; Zhang, X.J.; Wang, X.L. (2017). "Review of historical and current research on the Late Cretaceous dinosaurs and dinosaur eggs from Laiyang, Shandong" (PDF). Vertebrata PalAsiatica. 55 (2): 187–200. Archived from the original (PDF) on 2017-09-02. Retrieved 2022-10-25.
  5. 1 2 3 4 5 "Table 21.1," in Weishampel, et al. (2004). Page 466.
  6. 1 2 3 4 5 6 "48.9 Shandong, People's Republic of China; 1. Wangshi Group," in Weishampel, et al. (2004). Page 598.
  7. 1 2 Z. Dong. (1978). [A new genus of Pachycephalosauria from Laiyang, Shantung]. Vertebrata PalAsiatica 16(4):225–228.
  8. 1 2 Listed as "Pinacosaurus cf. grangeri" in "48.9 Shandong, People's Republic of China; 1. Wangshi Group," in Weishampel, et al. (2004). Page 598.


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