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Lazhulong Formation
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Lazhulong Fm base reconstruction

Lazhulong Fm

Period: 
Devonian

Age Interval: 
D2-3 (22), Middle to Late Devonian


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Nanshan of Lazhulong in Rutog County, westernmost Xizang (Tibet). It was named by Zhang Binggao and He Guoxiong in 1984.


Lithology and Thickness

Limestone. It is dominated by carbonate rocks. Lower part consists of interbeds of grayish-white quartzose sandstone with grayish-black limestone. Upper part is composed of grayish-white to blackish-gray massive limestone intercalated with thin-bedded limestone. It is 130 m in thickness.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

This formation has a disconformable contact with the underlying quartz sandstone of the Yaxier Group.

Upper contact

Overlain by the dark-gray thin-bedded marl of the Yueyahu Fm of Lower Carboniferous.

Regional extent

It is distributed in the areas of Lazhulong of Rutog County, Daban of Shuangxian, Yueyahu, Wanquanhu, etc. in western Xizang.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[79.18,33.5],[79.45,32.66],[79.13,32.19],[80.03,31.67],[81.25,31.96],[81.3,32.89],[79.185,33.5]]]]}}

Fossils

Abundant brachiopod Tenticospirifer; coral Phillipsastraea; Stromatopora and bryozoan, etc., have been reported.


Age 

Middle to Late Devonian

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
378.90

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
359.30

Depositional setting

It is interpreted as a carbonate platform facies.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)