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Dananao Gr

Dananao Gr


Period: 
Carboniferous, Permian, Triassic, Jurassic, Cretaceous

Age Interval: 
P-K1 (97), Permian through early Cretaceous


Province: 
Taiwan

Type Locality and Naming

The type section is located in the Danan’ao (Tanan’ao) area of Taiwan Province. It was named by Ogasawara Yo-Tsu-O in 1933.

Synonym: Danan'ao Gr


Lithology and Thickness

Metamorphics. Metamorphosed rock series composed of a mixture including quartz-mica schist, phylite, green schist, quartz-schist and quartzite, marble, gneiss and metamorphosed basic rocks, including the Kainangan Fm Stratum, the Jiuqu Fm Stratum, the Changchun Fm Stratum and the Tianxiang Fm Stratum. Total thickness is about 6000 m.


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

Upper contact

Unconformable contact with the overlying Tertiary Bihou Fm, Bilushan Fm or Lushan Fm

Regional extent

The metamorphic complex of the Danan’ao Group can be divided into two lithologic zones, known as the “Tailuge Zone” and the “Yuli Zone” which were divided by Gu Cangbo in 1963. The two lithologic zones are separated from one another by the Shoufeng Fault. The scope of the “Tailuge Zone” on the western side of the fault is more wider, being possessed of many kinds of metamorphic rocks, including a great amount of marble and gneiss, while the scope of the “Yuli Zone” on the eastern side of the fault is much lesser, comprising largely mica-schist, quartz-mica schist, intercalated occasionally with green schist.


GeoJSON

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Fossils

Fusulinids, Coral, Dinoflagellates


Age 

The discovery of the Fusulinida and coral fossils in marble (Jiuqu Fm) of the Danan’ao Gr. demonstrated that its age should be of Permian Period. Meanwhile the quartz-mica-schist yields early Jurassic to early Cretaceous dinoflagellate fossils.

Age Span: 

    Beginning stage: 
Bashkirian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
323.40

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
113.20

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua