Infratrappean_Beds

Lameta Formation

Lameta Formation

Geologic formation in India

The Lameta Formation, also known as the Infratrappean Beds (not to be confused with the contemporaneous Intertrappean Beds), is a sedimentary geological formation found in Madhya Pradesh, Gujarat, Maharashtra, Telangana, and Andhra Pradesh, India, associated with the Deccan Traps.[1] It is of the Maastrichtian age (Late Cretaceous), and is notable for its dinosaur fossils

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History

The first fossils found in the Lameta Formation were discovered between 1917 and 1919.[2]

The Lameta Formation was first identified in 1981 by geologists working for the Geological Survey of India (GSI), G. N. Dwivedi and Dhananjay Mahendrakumar Mohabey, after being given limestone structures–later recognised as dinosaur eggs–by workers of the ACC Cement Quarry in the village of Rahioli near the city Balasinor in the Gujarat state of western India.[3]

Lithology

The formation is underlain by the Lower Cretaceous sedimentary "Upper Gondwana Sequence" also known as the Jabalpur Formation, and is overlain by the Deccan Traps basalt. The Lameta Formation is only exposed at the surface as small isolated outcrops associated with the Satpura Fault. The lithology of the formation, depending on the outcrop, consists of alternating clay, siltstone and sandstone facies, deposited in fluvial and lacustrine conditions. The environment at the time of deposition has alternatively been considered semi-arid, or tropical humid.[4][5]

Fossil content

Many dubious names have been created for isolated bones, but several genera of dinosaurs from these rocks are well-supported, including the titanosaur sauropods Isisaurus and Jainosaurus and the Abelisaurs Indosaurus, Indosuchus, and Rajasaurus and Noasaurids Laevisuchus.[6] Mammals are also known form the formation, such as the possibly late surviving Avashishta, the possibly youngest know stegosaurian Deltapodus, madtsoiid snakes and other fossils.

Dinosaurs

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.
Life restoration of dinosaurs in Lameta Formation in which a group of Rajasaurus (Middle) hunting an Isisaurus (Middle) with an Indosuchus (bottom left) watching it with her chicks and a Laevisuchus (Bottom right) running with two Jainosaurus (Top Left) in the background
Sauropods
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Theropods
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Ornithischian
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Reptile

Snakes

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Turtles

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Mammals

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Mollusca

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See also

References

  1. [1]
    Wilson Mantilla, Gregory P.; Renne, Paul R.; Samant, Bandana; Mohabey, Dhananjay M.; Dhobale, Anup; Tholt, Andrew J.; Tobin, Thomas S.; Widdowson, Mike; Anantharaman, S.; Dassarma, Dilip Chandra; Wilson Mantilla, Jeffrey A. (2022-04-01). "New mammals from the Naskal intertrappean site and the age of India's earliest eutherians". Palaeogeography, Palaeoclimatology, Palaeoecology. 591: 110857. Bibcode:2022PPP...59110857W. doi:10.1016/j.palaeo.2022.110857. ISSN 0031-0182.
  2. [2]
    F. v. Huene and C. A. Matley, (1933), "The Cretaceous Saurischia and Ornithischia of the Central Provinces of India", Palaeontologica Indica (New Series), Memoirs of the Geological Survey of India 21(1): 1-74
  3. [3]
    Wilson, J. A.; Sereno, P. C.; Srivastava, S.; Bhatt, D. K.; Khosla, A.; Sahni, A. (2003). "A new abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India" (PDF). Contributions from the Museum of Paleontology University of Michigan. 31 (1): 1–42.
  4. [4]
    Srivastava, Ashok K.; Mankar, Rupesh S. (January 2015). "Lithofacies architecture and depositional environment of Late Cretaceous Lameta Formation, central India". Arabian Journal of Geosciences. 8 (1): 207–226. Bibcode:2015ArJG....8..207S. doi:10.1007/s12517-013-1192-y. ISSN 1866-7511. S2CID 67851941.
  5. [5]
    Kumari, Anjali; Singh, Seema; Khosla, Ashu (January 2021). "Palaeosols and palaeoclimate reconstruction of the Maastrichtian Lameta Formation, Central India". Cretaceous Research. 117: 104632. Bibcode:2021CrRes.11704632K. doi:10.1016/j.cretres.2020.104632. S2CID 224946979.
  6. [6]
    Weishampel et al., 2004, pp.517-606
  7. [7]
    "Table 13.1," in Weishampel, et al. (2004). Page 269.
  8. [8]
    "Table 13.1," in Weishampel, et al. (2004). Page 270.
  9. [9]
    "Table 13.1," in Weishampel, et al. (2004). Page 271.
  10. [10]
    Khosla, Ashu; Lucas, Spencer G. (2020), "Discussion: Oospecies Diversity, Biomineralization Aspects, Taphonomical, Biostratigraphical, Palaeoenvironmental, Palaeoecological and Palaeobiogeographical Inferences of the Dinosaur-Bearing Lameta Formation of Peninsular India", Late Cretaceous Dinosaur Eggs and Eggshells of Peninsular India, vol. 51, Cham: Springer International Publishing, pp. 207–271, doi:10.1007/978-3-030-56454-4_5, ISBN 978-3-030-56453-7, retrieved 2024-01-21
  11. [11]
    Mohabey, D. M.; Samant, B.; Vélez-Rosado, K. I.; Wilson Mantilla, J. A. (2024). "A review of small-bodied theropod dinosaurs from the Upper Cretaceous of India, with description of new cranial remains of a noasaurid (Theropoda: Abelisauria)". Journal of Vertebrate Paleontology. e2288088. doi:10.1080/02724634.2023.2288088.
  12. [12]
    "Table 3.1," in Weishampel, et al. (2004). Page 50.
  13. [13]
    "Table 3.1," in Weishampel, et al. (2004). Page 49.
  14. [14]
    Mohabey, Dhananjay M.; Samant, Bandana; Vélez-Rosado, Kevin I.; Wilson Mantilla, Jeffrey A. (2024-02-07). "A review of small-bodied theropod dinosaurs from the Upper Cretaceous of India, with description of new cranial remains of a noasaurid (Theropoda: Abelisauria)". Journal of Vertebrate Paleontology. doi:10.1080/02724634.2023.2288088. ISSN 0272-4634.
  15. [15]
    "Table 17.1," in Weishampel, et al. (2004). Page 368.
  16. [16]
    "Table 17.1," in Weishampel, et al. (2004). Page 367.
  17. [17]
    Khosla, Ashu; Lucas, Spencer G. (2020), "Indian Late Cretaceous Dinosaur Nesting Sites and Their Systematic Studies", Late Cretaceous Dinosaur Eggs and Eggshells of Peninsular India, vol. 51, Cham: Springer International Publishing, pp. 117–205, doi:10.1007/978-3-030-56454-4_4, ISBN 978-3-030-56453-7, retrieved 2024-02-13
  18. [18]
    Galton, Peter M.; Ayyasami, Krishnan (2017-07-01). "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. ISSN 0077-7749.
  19. [19]
    Chatterjee, Sankar (2020), Prasad, Guntupalli V.R.; Patnaik, Rajeev (eds.), "The Age of Dinosaurs in the Land of Gonds", Biological Consequences of Plate Tectonics: New Perspectives on Post-Gondwana Break-up–A Tribute to Ashok Sahni, Vertebrate Paleobiology and Paleoanthropology, Cham: Springer International Publishing, pp. 181–226, doi:10.1007/978-3-030-49753-8_8, ISBN 978-3-030-49753-8, retrieved 2024-03-29
  20. [20]
    Mohabey, D.M.; Head, J.J.; Wilson, J.A. (2011). "A new species of the snake Madtsoia from the Upper Cretaceous of India and its paleobiogeographic implications". Journal of Vertebrate Paleontology. 31 (3): 588–595. Bibcode:2011JVPal..31..588M. doi:10.1080/02724634.2011.560220. S2CID 129792355.

Bibliography

  • Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2
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