Sillakkudi Formation

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]

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″N 79°02′15″E
Sillakkudi Formation (India) Show map of India Sillakkudi Formation (Tamil Nadu) Show map of Tamil Nadu

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]