Sillakkudi Formation

Sillakkudi formation
Stratigraphic range: Early Campanian ~82–78  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Ariyalur Group
Underlies	Kallakurichi Formation
Overlies	Anaipadi Formation
Lithology
Primary	Sandstone
Location
Location	Sillakkudi
Region	Tamil Nadu
Country	India
Type section
Coordinates	11°05′50″N79°02′15″E / 11.09722°N 79.03750°E / 11.09722; 79.03750
Sillakkudi Formation (India) Show map of India Sillakkudi Formation (Tamil Nadu) Show map of Tamil Nadu

The Sillakkudi Formation is a Late Cretaceous (Campanian) geological formation located in Tamil Nadu, India it forms part of the Ariyalur Group. It dates to the Campanian of the Late Cretaceous. ^{[1] [2]}

Description

The formation was deposited in a Shallow Marine setting as it shows signs of a mobile deposition of substrate. The diversity of the Mollusc fauna of the formation also indicates a shallow marine deposition. ^[3]

Fossil content

Lamellibranchs and echinoid fragments have been reported from the Sillakkudi formation. ^[3]

Molluscs from the Sillakkurdi formation
Genus	Species	Material	Notes	Member
Inoceramus [3]	I. sp.
Karapadites [3]	K. karapadense

Foraminiferas from the Sillakkudi formation
Genus		Species	Material	Notes	Member
Globotruncana	G. arca [3]
	G. ventricosa [3]
	G. elevata [3]

References

1. Bakkiaraj, D.; Nagendra, R.; Nagarajan, R.; Armstrong-Altrin, John S. (2010). "Geochemistry of sandstones from the Upper Cretaceous Sillakkudi Formation, Cauvery Basin, southern India: Implication for provenance". Journal of the Geological Society of India. 76 (5): 453–467. doi:10.1007/s12594-010-0128-3. hdl: 20.500.11937/18718 . ISSN   0016-7622.
2. Paranjape, Amruta R.; Kulkarni, Kantimati G.; Kale, Anand S. (2023). "Facies and trace fossils of the Upper Cretaceous Sillakudi Formation (Cauvery Basin, S. India) and their palaeoenvironmental significance". Journal of the Palaeontological Society of India. 68 (2): 262–272. doi: 10.1177/05529360231205315 . ISSN   0552-9360.
3. "Sillakkudi Formation". indplex.geolex.org. Retrieved 2024-12-15.