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Laotudingzi Formation
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Laotudingzi Fm base reconstruction

Laotudingzi Fm

Period: 
Devonian

Age Interval: 
D3 (8), Late Devonian


Province: 
Heilongjiang

Type Locality and Naming

The representative section is located in Baoqing County, Heilongjiang Province. It was named by by Zhang Jiayuan in 1960, but type section was not given. “The Regional Stratigraphic Scale of Northeast China; Heilongjiang Province facsimile” quoted it formally in 1979


Lithology and Thickness

Pyroclastic rocks. It is composed of intermediate and acidic pyroclastic rocks intercalated with lava and clastic rock. The volcanic rocks are dominated by acidic rock of various contents. In general, the volcanic activity is stronger in the south.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It conformably contacts the underlying Heitai Fm.

Upper contact

It conformably contacts the overlying Qilikashan Fm.

Regional extent

This formation is distributed in Mishan--Baoqing areas of Heilongjiang Province and usually associated with the Heitai Fm. In areas of Laotudingzi, Lanhuadingzi and Qilikashan etc. the volcanic rocks are of great volume with increased thickness, so as the thickest strata at Laotudingzi is 918 m. The formation is also incompletely outcropped in Xiaobeihu of Ningan County, southwest of Mudanjiang City.


GeoJSON

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Fossils

No fossils have been found yet.


Age 

The age is inferred Late Devonian based on its stratigraphic position (Heilongjiang Regional Stratigraphic Annales, 1994).

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
378.90

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
371.10

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)