Ariyalur Group Geological group in Southern India Ariyalaur Group Stratigraphic range: Late Cretaceous to Palaeogene (Paleocene) (Campanian to Danian) ~82–65.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N Type Geological group Sub-units Sillakkudi formation, Kallakurichi Formation, Ottakovil formation, Kallamedu Formation Underlies Niniyur Formation Overlies Anaipadi Formation, Trichinopoly Group Location Country  India Ariyalur Group (India) Show map of India Ariyalur Group (Tamil Nadu) Show map of Tamil Nadu The Ariyalaur Group is a geological group in Tamil Nadu in Southern India.[1][2] 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.[3] "Disassociated remains" and teeth. Kallamedu formation Carnosauria indet.?[4] "Fragmentary remains". Carnosauria was often used as a wastebasket taxon. Kallamedu formation Troodontidae indet.[3] One isolated tooth (DUGF/52). Kallamedu formation Bruhathkayosaurus[4][5] 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.[6][7] "Fragmentary remains". Kallamedu formation Titanosauria Indeterminate.[8] Solitary egg. Kallamedu formation Titanosauria Indeterminate.[9] 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.[5] Kallamedu formation Fusioolithus[8] F. baghensis Dinosaur eggs. Kallamedu formation ?Camarasauridae[10] Indeterminate. Vertebrae. Camarasaurids are not known from the cretaceous. Kallamedu formation ?Stegosauria[11] Indeterminate. Misinterpreted sauropod bone. Other more plausible Stegosaur material is known from Cretaceous India. Kallamedu formation Sauropoda Sauropoda indet.[5] "Scant remains". Stegosauria Stegosauria indet.[5] Theropoda Theropoda indet.[5] "Scant remains". Theropoda[12] indet. A Theropod. Kallankurichchi formation ?Titanosaurus[12] T. indicus A dubious genus of titanosaurian sauropod. Kallakurichi Formation Megaloolithus[13] M. cylindricus Fossilised eggs. A Sauropod Oogenus. Kallakurichi Formation The holotype of Sanajeh preserved with Megaloolithus Stegosauridae[12] Stegosauridae indet A Stegosaurid. Kallakurichi Formation Molluscs from the Ariyalaur group Genus Species Material Notes Member Images Inoceramus[5] I. sp. Sillakkudi formation Karapadites[5] K. karapadense Sillakkudi formation Inoceramus[14] I. bulbus A clam. Kallakurichi formation I. tamulicus Kallakurichi formation Pycnodonta[14] P. vesicularis A clam. Kallakurichi formation Ostrea (Alectryonia)[14] sp. A clam. Kallakurichi formation Anisomyon[14] A. indicus A snail. Kallakurichi formation Foraminiferas from the Ariyalaur group Genus Species Material Notes Images Globotruncana G. arca[5] Sillakkudi formation G. ventricosa[5] Sillakkudi formation G. elevata[5] Sillakkudi formation Sea Urchins from the Ariyalaur group Genus Species Material Member Notes Images Hemipneustes H. compressus[15] Kallakurichi Formation Rhynchonellatans from the Ariyalaur group Genus Species Material Notes Member Images Rectithyris R. subdepressa[14] Kallakurichi Formation Rhynchonella R. sp.[14] Kallakurichi Formation Brachiopods from the Ariyalaur group Genus Species Material Notes Member Images Gyrodina G. globosa[14] Kallakurichi Formation Neobulimina N. sp.[14] Kallakurichi Formation Arthropods from the Ariyalur group Genus Species Material Notes Member Images Thalassinoides T. sp.[16] An ichnofossil made by decapod crustaceans, or fish Ottakovil Formation Ophiomorpha O. sp.[16] Made by burrowing arthropods Ottakovil Formation 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. Bibcode:2010JGSI...76..453B. doi:10.1007/s12594-010-0128-3. hdl:20.500.11937/18718. ISSN 0016-7622. ^ Banerji, Ranjit K. (1966-06-01). "The Genus Globotruncana and Biostratigraphy of the Lower Ariyalur Stage (upper Cretaceous) of Vridhachalam, South India". Journal Geological Society of India. 7 (1): 51–69. doi:10.17491/jgsi/1966/070111. ISSN 0974-6889. ^ a b Goswami, A.; Prasad, G. V. R.; Verma, O.; Flynn, J. J.; Benson, R. B. J. (2013). "A troodontid dinosaur from the latest Cretaceous of India". Nature Communications. 4: 1703. Bibcode:2013NatCo...4.1703G. doi:10.1038/ncomms2716. PMID 23591870. ^ a b Yadagiri, P. and Ayyasami, K. (1987). "A carnosaurian dinosaur from the Kallamedu Formation (Maestrichtian horizon), Tamilnadu." In M.V.A. Sastry, V.V. Sastry, C.G.K. Ramanujam, H.M. Kapoor, B.R. Jagannatha Rao, P.P. Satsangi, and U.B. Mathur (eds.), Three Decades of Development in Palaeontology and Stratigraphy in India. Volume 1. Precambrian to Mesozoic. Geological Society of India Special Publication, 11(1): 523–528. ^ a b c d e f g h i j Pal, Saurabh; Ayyasami, Krishnan (May 2022). "The lost titan of Cauvery". Geology Today. 38 (3): 112–116. Bibcode:2022GeolT..38..112P. doi:10.1111/gto.12390. ISSN 0266-6979. ^ R. Lydekker. (1877). Notices of new and other Vertebrata from Indian Tertiary and Secondary rocks. Records of the Geological Survey of India 10(1):30–43 ^ C. R. Narayana Rao and L. Rama Rao. 1930. The limb bones of a sauropodous dinosaur. Proceedings of the Indian Science Congress, Allahabad 17:330. ^ a b Dhiman, Harsha; Prasad, Guntupalli V. R.; Goswami, Anjali (2018). "Parataxonomy and palaeobiogeographic significance of dinosaur eggshell fragments from the Upper Cretaceous strata of the Cauvery Basin, South India". Historical Biology: 1–13. doi:10.1080/08912963.2018.1450408. S2CID 89969203. ^ Matley, 1929. "The Cretaceous Dinosaurs of the Trichinopoly district and the rocks associated with them". Records of the Geological Survey of India. Vol. 61 (4):337-349. ^ C. R. Narayana Rao and L. Rama Rao. 1930. Some dinosaurian vertebrae. Proceedings of the Indian Science Congress, Allahabad 17:329. ^ Peter M. Galton; Krishnan Ayyasami (2017). "Purported latest bone of a plated dinosaur (Ornithischia: Stegosauria), a "dermal plate" from the Maastrichtian (Upper Cretaceous) of southern India". Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 285 (1): 91–96. doi:10.1127/njgpa/2017/0671. ^ a b c Weishampel, et al. (2004). The Dinosauria. Second Edition. p. 680. ^ Kohring et al., 1996[incomplete short citation] ^ a b c d e f g h Ayyasami, 1989[incomplete short citation] ^ Aziz & Badve, 1990[incomplete short citation] ^ a b Pal, Saurabh; Ayyasami, Krishnan (May 2022). "The lost titan of Cauvery". Geology Today. 38 (3): 112–116. Bibcode:2022GeolT..38..112P. doi:10.1111/gto.12390. ISSN 0266-6979.

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