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Lingxiang Formation
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Lingxiang Fm base reconstruction

Lingxiang Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1lx, (33b)


Province: 
Hubei

Type Locality and Naming

SE Hubei. Xie Jiarong erected the Lingxiang sandstone in 1924. The type locality for the designation is in Lingxiang of the Daye County of Hubei. The reference section is from Liangting-Sanjiaoshan of Jijia of the Daye County, Hubei.


Lithology and Thickness

The Lingxiang Formation is represented by a set of grayish yellow, yellowish green and purple red inland lacustrine clastic rocks with tuff, andesite basalt and andesite, which is divided into three members. Lower member is built up by calcareous siltstone, tuffaceous grit, feldspar-quartz sandstone, sandy conglomerate and conglomerate. Middle member is siltstone, fine sandstone, marl, sandstone and shale. Upper member is feldspar quartz sandstone, siltstone, shale, tuff with andesite basalt and andesite. It is essentially persistent in lithology and is 526-896.66 m in total thickness.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The base of the formation built up by a set of conglomerate is distinguished from the Yanshanian Fm. (Jurassic) porphyritic diorite. It shows an unconformable contact with the underlying strata.

Upper contact

The top is marked by the appearance of breccia tuff at the base of the Dasi Fm. It shows an unconformable contact with the overlying strata.

Regional extent

The formation occurs in Daye, Echeng, Wuchang and Puqi of southeast Hubei. In the Wulidun area of Wuchang there occur 8 mineable gypsum beds.


GeoJSON

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Fossils

The formation yields ostracods Cypridea magna, C. gunsulinensis, C. (Morinina) sp., C. (Bisulcocypridea) sp., Darwinula contracta; bivalves Sphaerium pujiangensis, S. jeholense; floras Frenelopsis parceramosa, Cupressinocladus hubeiensis, Ptiophyllum pecten.


Age 

The whole rock of olivine basalt collected from the formation dates 114 Ma, andesite 127 Ma and basalt 121 Ma.

Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
143.10

    Ending stage: 
Hauterivian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
130.16

Depositional setting

It is of lacustrine deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao