Bharatpedia

Lameta Formation


Template:Infobox Rockunit The Lameta Formation, also known as the Infratrappean Beds, is a sedimentary geological formation found in Madhya Pradesh, Gujarat, and Maharashtra, India, associated with the Deccan Traps. It is of Maastrichtian age (Late Cretaceous), and is notable for its dinosaur fossils. Many dubious names have been created for isolated bones, but several genera of dinosaurs from these rocks are well-supported, including the titanosaur sauropod Isisaurus and the abelisaurs Indosaurus, Indosuchus, Laevisuchus, and Rajasaurus.[1] As well as mammals, snakes and other fossils.

LithologyEdit

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.[2][3]

DinosaursEdit

Genus Species Location Stratigraphic position Material Notes Images
Indosaurus I. matleyi Partial skeleton, including a partial skull.[4]
Brachypodosaurus B. gravis "Humerus."[5]
Coeluroides C. largus "Isolated vertebrae."[6]
Dryptosauroides D. grandis "Vertebrae."[6]
Indosuchus I. raptorius Cranial remains, including two braincases, as well as a nearly complete skeleton.[4]
 
Isisaurus I. colberti
 
Jainosaurus J. septentrionalis "Basicranium and partial postcranial skeleton."[7]
Jubbulpuria J. tenuis "Vertebrae."[6]
Lametasaurus L. indicus "Sacrum, ilia, tibia."[6] "Sacrum, ilia, tibia, spines, armor."[8]
Laevisuchus L. indicus Only vertebrae.[4]
Ornithomimoides O. barasimlensis "Vertebrae."[6]
O. mobilis "Vertebrae"[6]
Orthogoniosaurus O. matleyi "Tooth"[6]
Rahiolisaurus R. gujaratensis
 
Rajasaurus R. narmadensis
 
Titanosaurus T. blanfordi "Caudal vertebrae."[9]
T. indicus "Teeth"[10]

SnakesEdit

Genus Species Location Stratigraphic position Material Notes Images
Sanajeh S. indicus A skull, precloaca vertebrae and ribs. A madtsoiid snake
 
Sanajeh about to attack a titanosaur hatchling

TurtlesEdit

Genus Species Location Stratigraphic position Material Notes Images
Jainemys J. pisdurensis A bothremydid soft shelled turtle

See alsoEdit

ReferencesEdit

  1. ↑ Weishampel et al., 2004, pp.517-606
  2. ↑ 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. doi:10.1007/s12517-013-1192-y. ISSN 1866-7511.
  3. ↑ Kumari, Anjali; Singh, Seema; Khosla, Ashu (January 2021). "Palaeosols and palaeoclimate reconstruction of the Maastrichtian Lameta Formation, Central India". Cretaceous Research. 117: 104632. doi:10.1016/j.cretres.2020.104632.
  4. ↑ 4.0 4.1 4.2 "Table 3.1," in Weishampel, et al. (2004). Page 49.
  5. ↑ "Table 17.1," in Weishampel, et al. (2004). Page 367.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 "Table 3.1," in Weishampel, et al. (2004). Page 50.
  7. ↑ "Table 13.1," in Weishampel, et al. (2004). Page 269.
  8. ↑ "Table 17.1," in Weishampel, et al. (2004). Page 368.
  9. ↑ "Table 13.1," in Weishampel, et al. (2004). Page 270.
  10. ↑ "Table 13.1," in Weishampel, et al. (2004). Page 271.

BibliographyEdit

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