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Sylhet Trap Formation
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Sylhet Trap Fm base reconstruction

Sylhet Trap Fm

Period: 
Cretaceous

Age Interval: 
Late Aptian


Province: 
North East Basins of India

Type Locality and Naming

Type section is in the Um Sohryngkew River section. Its thickness is 270 m. [Original Publication: Medlicott, H. B., 1869. Geological Sketch of the Shillong Plateau, Mem. Geol. Surv. India vol. VII, pt. 1, pp. 151-207.]. Reference section: Jadukata River section.

[Figure 1: Formation stratotypes of North East Basins (modified after Pandey and Dave, 1998)]


Lithology and Thickness

Volcanic. Dark to bluish grey basaltic and andesitic flows with volcanic breccias. Maximum thickness is 650 m.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Unconformable contact with underlying metamorphic complex.

Upper contact

Unconformable contact with the overlying Mahadeo Fm.

Regional extent

Garo Hills, Khasi & Jaintia Hills: It is exposed all along the Khasi Hills through Jadukata to Dauki.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[90,25.82],[90.44,26.01],[90.75,25.69],[91.16,25.86],[91.88,25.98],[92.19,25.52],[92.52,25.62],[92.44,25.27],[91.9,25.18],[91.65,25.12],[91.11,25.2],[90.75,25.16],[90.42,25.15],[89.87,25.29],[90,25.82]]]]}}

Fossils

No report of fossils.


Age 

Late Aptian. (118 Ma). Synchronous with Mikar Trap Fm and Rajmahal Trap Fm. Set here to be same as Rajmahal Trap Fm span.

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
121.40

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
115.66

Depositional setting

Volcanic


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju