The Jiangjunding Formation is a geological formation in Shandong, China whose strata date back to the Campanian-Maastrichtian stages of the Late Cretaceous.Wangshi Group in the Paleobiology Database Dinosaur remains are among the fossils that have been recovered from the group.Weishampel et al., 2004, pp.593–600
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.
Fossil content Dinosaur eggs are known from this formation.
Dinosaurs
Ornithischians Ornithischians of the Jiangjunding FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage MicropachycephalosaurusZ. Dong. (1978). [A new genus of Pachycephalosauria from Laiyang, Shantung]. Vertebrata PalAsiatica 16(4):225–228. M. hongtuyanensis Shandong Province, China Campanian "Partial mandible, associated postcranial fragments"."Table 21.1," in Weishampel, et al. (2004). Page 466. A marginocephalian ornithischian PinacosaurusListed as "Pinacosaurus cf. grangeri" in "48.9 Shandong, People's Republic of China; 1. Wangshi Group," in Weishampel, et al. (2004). Page 598. P. cf. grangeri Shandong Province, China Campanian A ankylosaurine ankylosaurid Shantungosaurus S. giganteus Shandong Province, China Campanian to Maastrichtian A giant edmontosaurin saurolophine Tanius T. sinensis Shandong Province, China Campanian A hadrosauromorph hadrosauroid
Sauropods Sauropods of the Jiangjunding FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage Sauropoda indet. Indeterminate Shandong Province, China Campanian to Maastrichtian An indeterminate sauropod.
Theropods Theropods of the Jiangjunding FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage Coelurosauria indet. Indeterminate Shandong Province, China Campanian to Maastrichtian A coelurosaurian theropod
Turtles Turtles of the Jiangjunding FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage Cheloniidae Indet.Indeterminate"48.9 Shandong, People's Republic of China; 1. Wangshi Group," in Weishampel, et al. (2004). Page 598. Shandong Province, China Campanian to Maastrichtian A cheloniid turtle; which show similatiers to Nanhsiungchelyidae.
Oofossils Oofossils of the Jiangjunding FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage Laiyangoolithus L. lixiangensis Shandong Province, China Campanian to Maastrichtian Likely laid by troodontid Spheroolithus S. phacelus Shandong Province, China Campanian to Maastrichtian Likely laid by hadrosaurs or other ornithopods
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).
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