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Heitai Formation
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Heitai Fm base reconstruction

Heitai Fm

Period: 
Devonian

Age Interval: 
D1-D2 (8), Early to Middle Devonian


Province: 
Heilongjiang

Type Locality and Naming

The existing representative section in use is located at Zhuzhen back-hill of Xinzhong Village, 9 km northeast of the Heitai Railway Station in Mishan County, Heilongjiang Province. It was named by Yabe in 1940 with the section locality indicated but no character described.


Lithology and Thickness

Limestone, Sandstone. It is a set of continental-marine alternating sequences of clastic rock alternating with limestone. Basal part consists of coarse-grained granitic-clast sandstone, greywacke quartzose sandstone and quartzose sandstone intercalated with slate or bioclastic limestone.

Lower part of this formation is composed of sandy bioclastic limestone and silty slate intercalated with thin-bedded limestone, containing abundant fossils.

Upper part of the formation consists of rhythmites between sandstone, siltstone and tuff intercalated with minor bioclastic limestone, containing spore and plant fossils.

In the South about 118 m thick, in the North about 335m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The Formation unconformably overlies on the granite basement.

Upper contact

The formation is conformably capped by continental acidic volcanics of the Laotudingzi Fm.

Regional extent

The formation is distributed in the area from Mishan to Boqing in Heilongjiang Province

This formation distributes in longitudinal direction in eastern side of Jiamusi Massif and is merely 117.6 m thick at the southern end in Mishan County; but northwards to Baoqing County, where it was named the Qinglongshan Fm, it gradually gets thicker and can even reach 334 m.


GeoJSON

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Fossils

Fossils are mainly within sandy limestone and silty slate, including Coral: Sulcorphyllum-Cystiphylloides assemblage and Squameofavosites multispinulosus- Thamnopora wangi-Tyganolithes assemblage; Brachiopods: Borealispirifer divaricatus-Euryspirifer assemblage; conodonts Icriodus angustus, Coelocerodontus biconvexus, etc.; and ostracoda, bryozoan, blastoids, etc. In the Upper part, it yields Spores Dibolisporites, Apiculiretusispora, Grandispora, Biornatispora etc.; Plant fossils Taeniocrada decheniana, Barsassi; and Brachiopods Borealispirifer soboroca.


Age 

Early to Middle Devonian

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
400.78

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Su Yangzheng)