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Ariyalur Gr
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Ariyalur Gr base reconstruction

Ariyalur Gr

Period: 
Cretaceous

Age Interval: 
Coniacian through Maastrichtian; Outcrop and Subsurface


Province: 
E.India Cauvery Basin

Type Locality and Naming

OUTCROP succession, but also applied to SUBSURFACE

[Figure 1: Type-section Map of Subsurface Formations]


Lithology and Thickness

A grouping of Late Cretaceous (Coniacian through Maastrichtian) formations – sand-rich in outcrops, clay-rich sub-surface.

Outcrop succession in approximate lower to upper order: Sillakkudi Fm sandstone / Kallankurichchi Fm limestone / Ottakovil Fm sandstone / Kallamedu Fm sandstone.

Sub-surface in approximate lower to upper order: Kudavasal Fm claystone / Nannilam Fm claystone / Portonovo Fm claystone / Komarakshi Fm claystone.

[Figure 2: Generalized Stratigraphy of Cauvery Basin (Provided by A. Nallapa Reddy & R. Nagendra)]


Lithology Pattern: 
Sandy_claystone


Relationships and Distribution

Lower contact

Unconformable with the Bhuvanagiri Fm.

Upper contact

Unconformable with the Kamalapuram Fm /Karaikal Fm.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[80.06,11.96],[78.4,8.99],[79.03,9.011],[79.96,9.95],[80.14,10.3],[80.32,11.26],[80.06,11.96]]]]}}

Fossils


Age 

Santonian through Maastrichtian

Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
126.50

    Ending stage: 
Danian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
61.66

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

A. Nallapa Reddy & R. Nagendra