Kallakurichi Formation
| Kallakurichi Formation | |
|---|---|
| Stratigraphic range: Maastrichtian ~ | |
| Type | Geological formation |
| Unit of | Ariyalur Group |
| Underlies | Ottakovil formation |
| Overlies | Sillakkudi formation |
| Lithology | |
| Primary | Limestone |
| Location | |
| Coordinates | 11°06′N 79°06′E / 11.1°N 79.1°E |
| Approximate paleocoordinates | 35°18′S 56°24′E / 35.3°S 56.4°E |
| Region | Tamil Nadu |
| Country |  India |
| Type section | |
| Named for | Kallakurichi |
  Kallakurichi Formation (India)  Kallakurichi Formation (Tamil Nadu) | |
The Kallakurichi Formation, alternatively spelled as Kallankurichchi or Kallankurichi Formation,[1] is a geological formation of the Ariyalur Group in Tamil Nadu, southern India whose strata date back to the Maastrichtian stage of the Late Cretaceous. Dinosaur eggs of Megaloolithus cylindricus are among the fossils that have been recovered from the sandy limestones of the formation.[2]
Fossil content
[edit]The following fossils were reported from the formation:[1]
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
[edit]- Ornithischian
| Ornithischians from the Kallakurichi Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Material | Notes | ||
| Stegosauridae[3] | indet | A Stegosaurid. | |||
- Sauropods
| Sauropods from the Kallakurichi Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Material | Notes | ||
| ?Titanosaurus[3] | T. indicus | A titanosaurian sauropod. | |||
| Megaloolithus[4] | M. cylindricus | Fossilised Eggs | A Sauropod Oogenus. | ||
- Theropods
| Theropods from the Kallakurichi Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Material | Notes | ||
| Theropoda[3] | indet | A Theropod. | |||
Molluscas
[edit]| Molluscas from the Kallakurichi Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Material | Notes | ||
| Inoceramus[5] | I. bulbus | A Clam. | |||
| I. tamulicus | |||||
| Pycnodonta[5] | P. vesicularis | A Clam. | |||
| Ostrea (Alectryonia)[5] | sp. | A Clam. | |||
| Anisomyon[5] | A. indicus | A snail. | |||
| Brachiopods from the Kallakurichi formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Member |
| Gyrodina | G. globosa[5] | |||
| Neobulimina | N. sp.[5] | |||
| Foraminiferans from the Kallakurichi formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Member |
| Textulariina | T. nacataensis[5] | |||
| Rhynchonellatans from the Kallakurichi formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Member |
| Rectithyris | R. subdepressa[5] | |||
| Rhynchonella | R. sp.[5] | |||
| Sea Urchins from the Kallakurichi formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Member |
| Hemipneustes | H. compressus[6] | |||
See also
[edit]References
[edit]Bibliography
[edit]- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 21 February 2019
- Kohring, R.; Bandel, K.; Kortum, D.; Parthasararthy, S. (1996), "Shell structure of a dinosaur egg from the Maastrichtian of Ariyalur (southern India)", Neues Jahrbuch für Geologie und Paläontologie - Monatshefte, 1996: 48–64, doi:10.1127/njgpm/1996/1996/48
- Aziz, S.A.; Badve, R. M. (1990), "Occurrence of Hemipneustes Agassiz (Echinoid) from Tiruchirapalli Cretaceous, Tamil Nadu, India", Journal of the Geological Society of India, 36: 326–330
- Ayyasami, K (1989), "Genus Anisomyon (Gastropoda) from the Cretaceous of Southern India", Journal of the Geological Society of India, 33: 361–364