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
Yangtouya Formation
Click to display on map of the Ancient World at:
Yangtouya Fm base reconstruction

Yangtouya Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1yty, (25b)


Province: 
Shanxi

Type Locality and Naming

The Yangtouya Formation was erected by the Shanxi Bureau of Geology and Mineral Resources in 1989. The section for the designation is from Zhonggulou to Caohuan of the Zhongzhuangpu township of the Hunyuan County of Shanxi.


Lithology and Thickness

The Yangtouya Formation is mainly represented by gray yellow sandy conglomerate, with coal and shale in the lower part, which is roughly divided into two members. Lower member is built up by gray black sandy conglomerate with coal seams, carbonaceous shale and pyroclastic sedimentary rocks. Upper member is mainly yellow gray and gray sandy conglomerate with siltstone. It is 333.2 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

The conformable base of the formation marked by gray black conglomerate interbedded with mudstone is distinguished from the underlying Zhangjiakou Fm (N. Hebei column 25a) marked by dark purple red sandy mudstone.

Upper contact

The Yangtouya Formation is in conformable contact with overlying Zhongloupo Fm.

Regional extent

The present formation is mainly distributed in the Zhongzhuangpu, Luziwa and Nanshuitou-Xibolin areas of the Hunyuan County of northeast Shanxi, intercalated with coal in the lower member. In the Guojiapo-Tianqiao area of the Yanggao County, it is 1400 m thick with good quality coal of more than 18 m thick.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[113.59,40.4],[113.98,40.28],[114.28,40.02],[114.4,39.7],[114.35,39.33],[114.16,39.19],[113.81,39.04],[113.39,39.04],[113.01,39.09],[112.37,39.29],[112.14,39.69],[112.38,40.16],[112.97,40.39],[113.59,40.4]]]]}}

Fossils

The formation yields sporopollen grains Aequitriadites verrucosus, Crybelosporites stylosus, Poraminisporis dailyi, P. wonthagensis, Densoisporites microrugulatus, Kuylisporites lunaris, Osmundacidites sp., Neoraistrickia sp.; ostracods the Cypridea-Lycopterocypris assemblage; bivalves Unio sp.; floras Ginkgoites sp., Podozamites sp.


Age 

Shown as estimated Berriasian in the older Chinese lexicon stratigraphic column; but implied underlying of Valanginian-dated Zhangjiakou Fm volcanics (assigned as late Valanginian in Xi et al., 2019) at base of this section below the Zhongluopo Fm suggests a younger age of Valanginian-Hauterivian boundary (used here for graphics).

Age Span: 

    Beginning stage: 
Valanginian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
133.62

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
131.38

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao