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

UmlatodohLmsMbr Fm

Period: 
Paleogene

Age Interval: 
Late Paleocene to middle Eocene.


Province: 
North East Basins of India

Type Locality and Naming

Umlatodoh Limestone Member of the Sylhet Fm type section is in the Um Sohryngkew river section. [Original Publication: Wilson, G.F., and Metre W.B. 1953: Assam and Arakan, In: Science of Petroleum, vol. 6(1), pp. 119-123]

Synonyms: This is a member of the Sylhet Formation. Recognized by Wilson and Metre (1953) it is typically developed in the Um Sohryngkew River section.


Lithology and Thickness

Limestone: The Umlatodoh Limestone Member of the Sylhet Fm is dark grey and crystalline. It is well bedded, highly joined, hard and compact and highly fossiliferous. Thickness is 83 m. Laterally toward the Garo hills, it grades into calcareous sandstones or quartz sandstones of the Tura Fm. West of Lumshnong, it measures about 40 m thickness.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

The lower contact with the coal-bearing Sylhet LakadongSstMbr Fm is conformable.

Upper contact

It shows interbanding with sandstone and shale both near the lower and upper contact. The next higher Sylhet member is the Sylhet NarpuhSstMbr Fm

Regional extent

It is typically developed in the Um Sohryngkew River section. It extends from west of Therriaghat to the eastern margin of the South Shillong Plateau.


GeoJSON

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Fossils

Contains Alveolina sp.


Age 

Late Paleocene to middle Eocene.

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
52.04

    Ending stage: 
Ypresian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
48.07

Depositional setting

Shallow marine.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju