Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Jomadinla Formation
Click to display on map of the Ancient World at:
Jomadinla Fm base reconstruction

Jomadinla Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, (11b) K2jm


Province: 
Xizang (Tibet)

Type Locality and Naming

Himalayan North Belt. The Jomadinla Formation was erected by Wang Naiwen, Liu Guifang and Chen Guoming in 1983. The section for the designation is from the Kadong Village to Jomadinla in the Duoque District of the Nagarze County, Xizang (90°07′E; 28°08′N).


Lithology and Thickness

Pelagic and Flysch. Lower part of the formation is represented by gray green and brownish red chert beds and gray green siliceous rocks with red limestone lenses. The base is built up by light gray green quartz sandstone, sandy conglomerate and siliceous breccia. Middle part is gray green siliceous siltstone intercalated with gray and red limestone lenses, with the limestone bearing plankton foraminifera. Upper part is yellow green tuff, tuffaceous sandstone, porphyritic basalt and gray green volcanic breccia, agglomerate and tuffaceous cements with limestone lenses, bearing fossil belemnites. The formation is excess of 200 m in thickness.


Lithology Pattern: 
Siliceous limestone


Relationships and Distribution

Lower contact

The base is in conformable contact with the Gongboxue Fm.

Upper contact

The top of the formation is not observed.

Regional extent

The present formation is only observed in the Duoque area of the Nagarze County of Yamzho Yumcuo, which may be correlated with the upper part of the Zongzhuo Formation.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[90.99,28.74],[91.05,28.7],[91.26,28.57],[91.29,28.46],[91.2,28.44],[91,28.44],[90.68,28.48],[90.39,28.56],[90.17,28.64],[90.03,28.75],[90.06,28.82],[90.19,28.88],[90.35,28.89],[90.52,28.89],[90.75,28.84],[90.99,28.74]]]]}}

Fossils

In the Duoque area, it bears foraminifera such as Globotruncana linneiana, G. stuarti, G. carinata, Pseudotextularia sp., Heterohelix sp., etc.


Age 

Conformable base on Gongboxue Fm would imply, using China Lexicon strat chart, that it begins at base-Campanian. Top arbitrarily put here as top of Cretaceous.

Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
83.65

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
66.04

Depositional setting

Its sedimentary characteristics indicate that the formation is of typical eugeosynclinal flysch deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao