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LakadongSstMbr Formation
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LakadongSstMbr Fm base reconstruction

LakadongSstMbr Fm

Period: 
Paleogene

Age Interval: 
Paleocene/Late Paleocene to Eocene.


Province: 
North East Basins of India

Type Locality and Naming

The Lakadong Sandstone Member of the Sylhet Fm type section is in the Um Sohryngkew river section. Thickness is of 26 m. The member shows consistency in its lithological character. [Original Publication: Wilson, G.F., and Metre W.B. 1953: Assam and Arakan, In: Science of Petroleum, vol. 6(1), pp. 119-123.]

Synonyms: Srivastava et al., (1969) have reported typical development of the 'Lakadong Sandstone' from near the Lumshnong village in Jainita Hills, (Pandey and Dave, 1998).


Lithology and Thickness

Sandstone. Lakadong Sandstone Member of the Sylhet Fm is dirty white, light yellow in color, fine to coarse grained, sub angular to angular, quartzose in character. Current bedding is common. Two coal bands are present towards the base, (Pandey and Dave, 1998).

[Figure 1: Paleocene-Lower Eocene sequence of Upper Assam with its subdivisions (after Bharali and Gogoi, 2012)]

[Figure 2: The Lakadong Sandstone in MQS, position of the samples and simplified stratigraphic column of the quarry. The position of theboundary between SBZ 3 and 4 is tentative. The position of the lower samples (C1–5) from the first bench (B1), are not seen here. B: benchesin the limestone. (after ErkanOzcan et al., 2018)]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It has gradational contacts with the overlying Sylhet UmlatodohLmsMbr Fm.

Upper contact

It has gradational contacts with the underlying Sylet LakadongLmsMbr Fm.

Regional extent

It extends in the Khasi Hills from west of the Um Sohryngkew river till the eastern margin of the Shillong Plateau.


GeoJSON

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Fossils

It is generally unfossiliferous but towards the top a few fossiliferous bands yield fauna dominated by smaller benthic foraminfera. The coals yield leaf impressions.


Age 

Late Paleocene to Eocene.

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
56.00

    Ending stage: 
Ypresian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
52.04

Depositional setting

Regressive marginal marine to deltaic conditions. The base and top show considerable marine influence.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju