# Ariyalur Group

The Ariyalaur Group is a geological group in Tamil Nadu in Southern India.

## Fossil content

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
Dinosaurs from the Ariyalaur group :
| Genus | Species | Material | Notes | Member | Images |
| Abelisauridae indet. | | "Disassociated remains" and teeth. | | Kallamedu formation | |
| Carnosauria indet.? | | "Fragmentary remains". | Carnosauria was often used as a wastebasket taxon. | Kallamedu formation | |
| Troodontidae indet. | | One isolated tooth (DUGF/52). | | Kallamedu formation | |
| Bruhathkayosaurus | B. matleyi | ilium and ischium, femur, tibia, radius and part of a vertebra (specifically a platycoelous caudal centrum). Remains no longer exist. | Initially described as a Theropod, it was reclassified as a Titanosaur. | Kallamedu formation | |
| Sauropoda | Indeterminate. | "Fragmentary remains". | | Kallamedu formation | |
| Titanosauria | Indeterminate. | Solitary egg. | | Kallamedu formation | |
| Titanosauria | Indeterminate. | Ten large sauropod bones, some of which could be identified as a humerus or femur, proximal end of a femur and scapula. All the bones pertain to the limbs. | Similar in size to Bruhathkayosaurus. | Kallamedu formation | |
| Fusioolithus | F. baghensis | Dinosaur eggs. | | Kallamedu formation | |
| ?Camarasauridae | Indeterminate. | Vertebrae. | Camarasaurids are not known from the cretaceous. | Kallamedu formation | |
| ?Stegosauria | Indeterminate. | Misinterpreted sauropod bone. | Other more plausible Stegosaur material is known from Cretaceous India. | Kallamedu formation | |
| Sauropoda | Sauropoda indet. | | "Scant remains". | | |
| Stegosauria | Stegosauria indet. | | | | |
| Theropoda | Theropoda indet. | | "Scant remains". | | |
| Theropoda | indet. | | A Theropod. | Kallankurichchi formation | |
| ?Titanosaurus | T. indicus | | A dubious genus of titanosaurian sauropod. | Kallakurichi Formation | Titanosaurus |
| Megaloolithus | M. cylindricus | Fossilised eggs. | A Sauropod Oogenus. | Kallakurichi Formation | Sanajeh fossil The holotype of Sanajeh preserved with Megaloolithus |
| Stegosauridae | Stegosauridae indet | | | A Stegosaurid. | Kallakurichi Formation |
Molluscs from the Ariyalaur group :
| Genus | Species | Notes | Member |
| Inoceramus | I. sp. | | Sillakkudi formation |
| Karapadites | K. karapadense | | Sillakkudi formation |
| Inoceramus | I. bulbus | A clam. | Kallakurichi formation |
| Inoceramus | I. tamulicus | A clam. | Kallakurichi formation |
| Pycnodonta | P. vesicularis | A clam. | Kallakurichi formation |
| Ostrea (Alectryonia) | sp. | A clam. | Kallakurichi formation |
| Anisomyon | A. indicus | A snail. | Kallakurichi formation |
Foraminiferas from the Ariyalaur group :
| Genus | | Notes |
| Globotruncana | G. arca | Sillakkudi formation |
| Globotruncana | G. ventricosa | Sillakkudi formation |
| Globotruncana | G. elevata | Sillakkudi formation |
Sea Urchins from the Ariyalaur group :
| Genus | Species | Material | Member | Notes | Images |
| Hemipneustes | H. compressus | | Kallakurichi Formation | | |
Rhynchonellatans from the Ariyalaur group :
| Genus | Species | Material | Notes | Member | Images |
| Rectithyris | R. subdepressa | | | Kallakurichi Formation | |
| Rhynchonella | R. sp. | | | Kallakurichi Formation | |
Brachiopods from the Ariyalaur group :
| Genus | Species | Material | Notes | Member | Images |
| Gyrodina | G. globosa | | | Kallakurichi Formation | |
| Neobulimina | N. sp. | | | Kallakurichi Formation | |
Arthropods from the Ariyalur group :
| Genus | Species | Material | Notes | Member | Images |
| Thalassinoides | T. sp. | | An ichnofossil made by decapod crustaceans, or fish | Ottakovil Formation | |
| Ophiomorpha | O. sp. | | Made by burrowing arthropods | Ottakovil Formation | |