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

PalkStrait Oligocene Fm

Period: 
Paleogene

Age Interval: 
Oligocene and ? Late Eocene


Province: 
SriLanka Palk Strait

Type Locality and Naming

Palk Strait (between Sri Lanka and India); composite of Wells Delft, PalkBay and Pesalai.

[Figure: Generalized geologic map of Sri Lanka (from Edirisooriya et al., 2016, Geol. Mag. 155:907-920)]


Lithology and Thickness

Pelagic marl. Delft well has ca. 350 m of calcareous claystones, silty and sandy. PalkBay well has ca. 300 m of limestone and calcareous claystone.


Lithology Pattern: 
Pelagic marl


Relationships and Distribution

Lower contact

Conformable with PalkStrait Eocene Fm limestone in PalkBay well; but unconformable (major hiatus) on PalkStrait Aptian Fm sandstone in Delft well.

Upper contact

Conformable with PalkStrait EarlyMiocene Fm shallow-marine marl

Regional extent

Found in Delft, PalkBay and Pesalai wells of Palk Strait (between Sri Lanka and southern tip of India)


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.95,10.03],[80.07,10.02],[80.03,9.05],[78.91,9.06],[78.95,10.03]]]]}}

Fossils

Planktonic foraminfer of Globigerina, Ciperoensis, Globoratulia. Benthic foraminifers of Nummulites, Num. fichtali, Sphaeroidina bullords and reworked Pellatispira. Calcareous nannofossils.


Age 

Oligocene and ? Late Eocene

Age Span: 
s

    Beginning stage: 
Priabonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
37.71

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
23.04

Depositional setting

Upper bathyal


Depositional pattern:  


Additional Information


Compiler:  

Ravi Misra