| 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 / 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.
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.
Fossil content
Lamellibranchs and echinoid fragments have been reported from the Sillakkudi formation.
| Molluscs from the Sillakkurdi formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Member |
| Inoceramus | I sp. | |||
| Karapadites | K. karapadense | |||
| Foraminiferas from the Sillakkudi formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Material | Notes | Member | |
| Globotruncana | G. arca | ||||
| G. ventricosa | |||||
| G. elevata | |||||
References
- 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. ISSN 0016-7622.
- 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.
- ^ "Sillakkudi Formation". indplex.geolex.org. Retrieved 2024-12-15.