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Amile Formation
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Amile Fm base reconstruction

Amile Fm

Period: 
Paleogene

Age Interval: 
middle Paleocene


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Tansen and lower Kali Gandaki region


Lithology and Thickness

"It is made up of sandstones, shales, and limestones in varying proportions. It is mainly a non-marine sequence with some marine fossiliferous beds in its middle part. The Amile Formation is more than 230 m thick and divided up into the following three members:" ..Lower Member has a basal 10-m thick white pebbly quartz sandstone, followed by mottled sandstones. Middle Member is distinguished by marker beds of occurrence of fossiliferous limestones and siltstones, and rhodochrosite-bearing siltstones. " Upper Member consists predominantly of quartzose sandstone with a minor amount of thin-bedded carbonaceous muddy sandstone and carbonaceous shale intercalations."


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Major hiatus (entire Cretaceous absent) at a scoured contact to the underlying Taltung Fm.

Upper contact

Disconformably overlain by the Bhainskati Fm black claystones.

Regional extent

Widely distributed in the Tansen Synclinorium


GeoJSON

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Fossils

"The fossiliferous beds represented by argillaceous limestones (in Middle Member) contain bivalves, gastropods, echinoids, corals, and vertebrate bones."


Age 

Age span partly based on correlation to Pakistan units by K.S. Valdiya (2016; The Making of India; Springer Publ.)

Age Span: 

    Beginning stage: 
Selandian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
61.66

    Ending stage: 
Thanetian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
56.97

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Descriptions from Megh Raj Dhital (2015, Geology of Nepal: Regional Perspective of the Classic Collided Orogen, Springer Publ., 499 pp.). Age spans estimated from correlation diagrams in Martin, A.J. (2017, "A review of Himalayan stratigraphy, magmatism, and structure", Gondwana Research, 49: 42-80; http://dx.doi.org/10.1016/j.gr.2017.04.031), but these are often controversial.