Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Dongjing Formation
Click to display on map of the Ancient World at:
Dongjing Fm base reconstruction

Dongjing Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1dj, (34)


Province: 
Hunan

Type Locality and Naming

Hengyang Basin. The Dongjing Formation was erected by Wang Shui in 1962 in his report on the red beds of the Hengyang basin of Hunan. The section for the designation is at the Dongjing Village of the Hengyang County of Hunan and the reference section is from Yunshanling to Shangmei in Dongjing of the Hengyang County, Hunan.

The Dongjing Formation occurs under the Shenghuangshan Fm and over the Lower Jurassic Coal Measures Fm at the Dongjing Village of the Hengyang County, consisting of brown red gravel-bearing sandstone and siltstone with mudstone. It was assigned to Early Cretaceous. It was quoted in the regional geological survey report compiled by the Hunan Bureau of Geology and Mineral Resources in 1973.


Lithology and Thickness

The Dongjing Formation is represented by a set of purple red sandy conglomerate with mudstone, which is roughly divided into two members. Lower member is represented by purple red and yellow brown conglomerate, sandy conglomerate and limy and sandy mudstone. Upper member is purple red thick-bedded sandy conglomerate and limy and sandy mudstone. It is 553 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Its base is separated from the Lower Jurassic coal measures by the appearance of purple red conglomerate interbedded with mudstone. It is lies unconformably on the Upper Triassic-the Lower Jurassic Coal Measures Fm.

Upper contact

Its top a conformable contact bounded by the purple red thick-bedded conglomerate at the base of the Shenghuangshan Fm.

Regional extent

The formation occurs in the Shenhuangshan area of the Hengyang County, central Hunan. It is quite persistent in lithology and ranges from 10 to 553 m in thickness. Southward to Chenxian, it is extremely thin or absent, and northward to Xiangtan, Zhuzhou and Liuyang, it is mostly absent. It is called the Qijiahe Fm in north Hunan and the lower part of the Dongxiachang Fm in west Hunan.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[114.49,28.88],[114.55,28.73],[114.43,28.69],[114.23,28.61],[114.11,28.51],[113.93,28.24],[113.71,28.14],[113.59,27.98],[113.49,27.89],[113.36,27.7],[113.36,27.44],[113.2,27.16],[113.07,26.89],[113.04,26.65],[113.13,26.49],[113.18,26.33],[113.08,26.2],[113.02,25.97],[112.92,25.84],[112.82,25.91],[112.72,26.08],[112.66,26.14],[112.48,25.92],[112.22,26.07],[112.11,26.25],[112.04,26.43],[112.08,26.52],[112.11,26.64],[112.14,26.84],[112.33,26.92],[112.4,26.96],[112.49,27.08],[112.55,27.17],[112.6,27.25],[112.5,27.27],[112.3,27.18],[112.22,27.18],[112.29,27.34],[112.39,27.46],[112.6,27.54],[112.63,27.62],[112.74,27.7],[112.99,27.95],[113.26,28.17],[113.48,28.33],[113.49,28.45],[113.66,28.52],[113.8,28.53],[113.83,28.64],[113.94,28.69],[114.15,28.8],[114.49,28.88]]]]}}

Fossils

The formation yields bivalves Nakamuranaia chingshanensis, N. yongkanensis, Trigonioides kodairai, Spaerium yanbianensis, Nippononaia sp.; Ostracods Cypridea sp., Triangulicypris torsuosus, Mongolianella sp., Clinocypris sp.; Charophytes Flabellochara jurognica, Atopochara trivolvis, Clavator harrisi, Mesochara symmetrica and sporopollen grains.


Age 


Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
122.42

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting

It is of continental freshwater facies.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao