Upper Dharmaram Formation

The Upper Dharmaram Formation is an Early Jurassic geologic formation found in Andhra Pradesh, India. Dinosaur remains are among the fossils that have been recovered from the formation.

Upper Dharmaram Formation
Stratigraphic range: HettangianSinemurian
TypeGeological formation
UnderliesKota Formation
OverliesLower Dharmaram Formation
Lithology
PrimarySandstone, mudstone
Location
Coordinates19.3°N 79.5°E / 19.3; 79.5
Approximate paleocoordinates28.2°S 34.1°E / -28.2; 34.1
RegionAndhra Pradesh
Country India
ExtentPranhita–Godavari Basin
Upper Dharmaram Formation is located in India
Upper Dharmaram Formation
Upper Dharmaram Formation (India)

Age

The Upper Dharmaram Formation overlies the Lower Dharmaram Formation, which dates to the Late Triassic, and conformably underlies the Kota Formation, the age of which is uncertain. Typical Triassic fauna, such as phytosaurs and aetosaurs, are absent from the Upper Dharmaram Formation, suggesting that it is Jurassic in age and that the boundary between the Lower and Upper Dharmaram Formation may correspond to the Triassic-Jurassic boundary.[1] A Sinemurian age has been suggested based on faunal similarities to the Upper Elliot and Clarens Formations of southern Africa, the Kayenta Formation of North America, and the Lower Lufeng Formation of China.[2] A Hettangian age has also been suggested.[3]

Fossil organisms

Non-dinosaurian reptiles

Crocodylomorphs
Taxon Location Stratigraphic position Material Notes Images
aff. Dibothrosuchus[2] A sphenosuchian

Dinosaurs

Theropods
Taxon Location Stratigraphic position Material Notes Images
aff. Dilophosaurus[2] A large neotheropod similar to Dilophosaurus
Sauropodomorphs
Taxon Location Stratigraphic position Material Notes Images
Lamplughsaura dharmaramensis Partial skeletons of four individuals[4] Possible basal Sauropod.

Pradhania gracilis

Partial skeleton including a few skull bones, three vertebrae, and partial manus[5] A non-sauropod sauropodomorph, possibly a massospondylid.
Sauropodomorpha indet. Incomplete femur A probable third sauropodomorph taxon, distinct from both Lamplughsaura and Pradhania[6]

See also

References

  1. Kutty et al. 2007, p. 1218.
  2. Kutty et al. 2007, p. 1219.
  3. Chatterjee 2020, p. 194.
  4. Kutty et al. 2007, p. 1220.
  5. Kutty et al. 2007, p. 1232.
  6. Kutty et al. 2007, p. 1233.

Works cited

  • Chatterjee, Sankar (2020). "The Age of Dinosaurs in the Land of Gonds". In Prasad, Guntupalli V.R.; Patnaik, Rajeev (eds.). Biological Consequences of Plate Tectonics. Vertebrate Paleobiology and Paleoanthropology. Cham: Springer International Publishing. pp. 181–226. doi:10.1007/978-3-030-49753-8_8. ISBN 978-3-030-49752-1. S2CID 229651571.
  • Kutty, T.S.; Chatterjee, Sankar; Galton, Peter M.; Upchurch, Paul (2007). "Basal sauropodomorphs (Dinosauria: Saurischia) from the Lower Jurassic of India: their anatomy and relationships". Journal of Paleontology. 81 (6): 1552–1574. doi:10.1666/04-074.1. S2CID 130508134.
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