Upper Cretaceous dinosaur track assemblages and a new theropod ichnotaxon from Anhui Province, eastern China

Paleostress inversion of fault-slip data from the Jurassic to Cretaceous Huangshan Basin and implications for the tectonic evolution of southeastern China

A new mamenchisaurid dinosaur, Anhuilong diboensis gen. et sp. nov. from the Middle Jurassic of Eastern China is reported here. The holotype consists of complete left humerus, ulna and radius of an...

The second mamenchisaurid dinosaur from the Middle Jurassic of Eastern China

Well-preserved dinosaur eggs from the Cretaceous Huizhou Formation in the Xiuning Basin, Anhui Province, China, are analysed in this paper. We describe a new oospecies, Similifaveoloolithus qiyunsh...

A new oospecies of Similifaveoloolithidae from the Xiuning Basin, Late Cretaceous of Anhui, China

A new oogenus and oospecies, Umbellaoolithus xiuningensis oogen. et oosp. nov., is described on the basis of specimens from the Upper Cretaceous Huizhou Formation in the Huangshan area of Anhui Province, China. The Mesozoic strata developed in South Anhui, producing a large number of dinosaur skeletons, dinosaur eggs, dinosaur footprints and so on. The Xiuning Basin is a small intermountain basin during the Mesozoic. The Triassic strata are scattered and the Jurassic and Cretaceous strata are intact in the basin. The Jurassic strata include the lower Jurassic Yuetan Formation, and Middle Jurassic Hongqin Formation. The Cretaceous strata include the lower Cretaceous Bingqiu Formation, Shiling Formation and Yantang Formation, Upper Cretaceous Huizhou Formation, Qiyunshan Formation and Xiaoyan Formation. The materials we studied were found in the Huizhou Formation of Qiyunshan, Xiuning, in 2011. There is an incomplete egg nest consisting of at least 9 dinosaur eggs. The eggs are oval, arranged along the long axis of all the eggs parallel to each other, and not at the same horizontal level within the clutch, obviously differing from the elongated eggs, paired, regular arrangement and radial orientation seen in clutches attributable to the Elongatoolithidae and Macroelongatoolithidae. The eggs of Umbellaoolithus xiuningensis also differ in typical alignment from those of the Prismatoolithidae, which are vertical or near vertical. The average diameter of the eggs is 13.86 cm, the equatorial diameter is 10.43 cm, and the shape index is 75.25. In general, the eggshell units have the shape of an umbrella, triangle or cone, and are arranged irregularly, unlike in the Spheroolithidae, Stalicoolithidae and Ovaloolithidae. The cones are hemispherical in shape. The cone layer is very thin, its average thickness of 0.12 mm representing approximately 1/6 of the total eggshell thickness. Umbrella-like eggshell units are well-developed near the inner and outer surfaces of the columnar layer. The eggshells have numerous irregular pores, unlike in several oofamilies including the Dictyoolithidae and Faveoolithidae. Consequently, we established a new oofamily: Umbellaoolithidae oofam. nov.. This new specimen unambiguously represents a distinct oospecies of dinosaur eggs in southern Anhui, and provides new paleontological evidence bearing on the classification and correlation of Upper Cretaceous strata in southern Anhui.

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New oospecies of dinosaur eggs from the Upper Cretaceous of South Anhui

Based on 1∶50,000 scale regional geological survey of basic succession of variety of terrestrial facies depositional formations of Jurassic Cretaceous in the Tunxi Xiuning,Hongqin,Huayang and Qimen basin of Huangshan area,this paper describes and analyzes the corresponding depositional environment and depositional facies.The Jurassic Cretaceous red beds are divided into 4 grade stratigraphic sequences in light of interfaces majorly controlled by tectonic process.And the corresponding terrestrial facies depositional system tracts are delimited and sequence stratigraphic analysis is made, then the Huizhou formation lithostratigraphic framework is set up on the red bed basin according to different relationships of special distributions of depositional systems with sequence styles.

Jurassic cretaceous sequence stratigraphy of huangshan area in south anhui

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Jurassic cretaceous sequence stratigraphy of huangshan area in south anhui