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
Juanling Formation
Click to display on map of the Ancient World at:
Juanling Fm base reconstruction

Juanling Fm

Period: 
Paleogene

Age Interval: 
Early Paleocene , (18)


Province: 
Shaanxi

Type Locality and Naming

The naming section is located in the area from Tanggou to Niupanggou, Shanyang County, southeastern Shaanxi. Named by Xue Xiangxi, Zhang Yunxiang and Wang Haining in 1987.


Lithology and Thickness

Lower part is brownish red sandy conglomerate and conglomerate with lenticular sandy mudstone, which upward grade to yellowish green and light red muddy sandstone and sandy mudstone. Middle part is light red and brown pebbly sandy mudstone and muddy sandstone, intercalated or alternating with sandy conglomerate. Upper part is light brown pebbly muddy sandstone. The thickness is ~300 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It has a disconformable or conformable contact with the underlying Late Cretaceous Shanyang Fm (not yet in English Lexicon).

Upper contact

It has a disconformable or conformable contact with overlying Neogene. Regionally, the next younger unit is the Fangou Fm (middle Paleocene)

Regional extent

It is mainly distributed in Shanyang County, southeast Shaanxi.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[109.2,33.78],[109.48,33.72],[109.77,33.67],[110.07,33.6],[110.36,33.51],[110.58,33.42],[110.71,33.29],[110.65,33.23],[110.3,33.27],[109.96,33.35],[109.68,33.43],[109.34,33.56],[109.18,33.69],[109.18,33.73],[109.2,33.78]]]]}}

Fossils

Fossil mammals such as Bemalamebda sp. and Mesonychidae are found in the formation.


Age 

According to the paleomagnetic measurements, it is equivalent to Chrons C29r–C27 of the paleomagnetic time scale and its age is 65–61 Ma and the geologic age is early Paleocene. From the results of the paleomagnetic measurements of the cross section, the difference between the Upper Cretaceous–Paleocene boundary and the lithostratigraphic boundary is ~18 m.

Age Span: 

    Beginning stage: 
Maastrichtian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
67.27

    Ending stage: 
Danian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
61.66

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.