Lameta Formation

Coordinates: 23°12′N 80°00′E / 23.2°N 80.0°E / 23.2; 80.0
Source: Wikipedia, the free encyclopedia.
Lameta Formation
Ma
↓
Approximate paleocoordinates
24°42′S 63°12′E / 24.7°S 63.2°E / -24.7; 63.2
RegionWestern India
Country India
ExtentMadhya Pradesh, Gujarat, Maharashtra, Andhra Pradesh, Telangana
Type section
Named forLameta Ghat
Lameta Formation is located in India
Lameta Formation

The Lameta Formation, also known as the Infratrappean Beds (not to be confused with the contemporaneous

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

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

semi-arid, or tropical humid.[4][5]

Fossil content

Many

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

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
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.
Sauropods
Genus Species Location Stratigraphic position Material Notes Images
Isisaurus I. colberti Dongargaon Hill Holotype skeleton consists of cervical, dorsal, sacral, caudal vertebrae, ribs, pelvis, scapula, coracoid, left forelimb, and other bones. Other specimens such as skull, hindlimb, and foot bones are unknown. A
titanosaur
.
Jainosaurus J. septentrionalis Bara Simla "Basicranium and partial postcranial skeleton."[7] A
titanosaur
.
Titanosaurus T. blanfordi "Caudal vertebrae."[8] A titanosaur.
T. indicus "Teeth"[9]
Megaloolithus[10] M. cylindricus Sauropod egg fossils
M. dhoridungriensis
M. jabalpurensis
M. khempurensis
M. megadermus
M. problematica
M. walpurensis
M. sp.
Theropods
Genus Species Location Stratigraphic position Material Notes Images
Compsosuchus C. solus "Vertebrae" Previously considered a Noasaurid now considered an indeterminate Abelisaurid[11]
Coeluroides C. largus Bara Simla "Isolated vertebrae."[12] A Indeterminate theropod also known from Dabrazhin Formation of Kazakhstan
Dryptosauroides D. grandis Bara Simla "Vertebrae."[12]
Indosaurus I. matleyi Bara Simla Partial skeleton, including a partial skull.[13]
Indosuchus I. raptorius Bara Simla Cranial remains, including two braincases, as well as a nearly complete skeleton.[13] An
abelisaurid
theropod.
Jubbulpuria
 		J. tenuis "Vertebrae."[12] Likely junior synonym of Laevisuchus[14]
Lametasaurus
 		L. indicus Bara Simla "Sacrum, ilia, tibia."[12] "Sacrum, ilia, tibia, spines, armor."[15]
Laevisuchus L. indicus Bara Simla Only vertebrae.[13] A noasaurid
Ornithomimoides O. barasimlensis Bara Simla "Vertebrae."[12] An abelisaurid[14]
O. mobilis Bara Simla "Vertebrae"[12]
Orthogoniosaurus O. matleyi Bara Simla "Tooth"[12]
Rahiolisaurus R. gujaratensis Rahioli Village Cervical, dorsal, sacral, and caudal vertebrae, portions of pectoral and pelvic girdles, and several hind limb bones of different individuals. An
abelisaurid
.
Rajasaurus R. narmadensis Temple Hill, Rahioli A partial skeleton consists of maxillae, premaxillae, braincase, and quadrate bone on the skull; and spine, hip bone, legs, and tail in post-cranial remains. An
abelisaurid
.
Noasauridae Indeterminate A partial dentary[14] A noasaurid.
Ornithischian
Genus Species Location Stratigraphic position Material Notes Images
Brachypodosaurus B. gravis "Humerus."[16] May not be dinosaurian
Spheroolithus? Sp. Polgaon,

Tidkepar

Egg fossils Questionably assigned to this genus[17]
Deltapodus[18] Solitary footprint Possibly a
Stegosaur, Like Dravidosaurus
Ankylosauria Indeterminate Rahioli Isolated vertebrae, scapulocoracoid, humerus, femur, and several armor fragments such as hollow lateral spikes and solid dorsal scutes.[19] Possibly a
nodosaurid
.

Reptile

Snakes

Genus Species Location Stratigraphic position Material Notes Images
Sanajeh S. indicus A
ribs
. 		A madtsoiid snake
titanosaur
hatchling
Madtsoia M. pisdurensis[20] A madtsoiid snake

Turtles

Genus Species Location Stratigraphic position Material Notes Images
Jainemys J. pisdurensis A bothremydid side-necked turtle

Mammals

Genus Species Location Stratigraphic position Material Notes Images
Avashishta A. bacharamensis A Haramiyida Mammal

Mollusca

Genus Species Location Notes
Mollusca Indeterminate
Gastropoda Indeterminate
Viviparus V. normalis
Physa P. normalis

sp.

Paludina
 P. deccanensis
Lymnaea L. subulata
Unio U. deccanensis

sp.

See also

References

  1. ISSN 0031-0182
    .
  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. ^ 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. S2CID 67851941
    .
  5. S2CID 224946979
    .
  6. ^ Weishampel et al., 2004, pp.517-606
  7. ^ "Table 13.1," in Weishampel, et al. (2004). Page 269.
  8. ^ "Table 13.1," in Weishampel, et al. (2004). Page 270.
  9. ^ "Table 13.1," in Weishampel, et al. (2004). Page 271.
  10. ISBN 978-3-030-56453-7
    , retrieved 2024-01-21
  11. doi:10.1080/02724634.2023.2288088
    .
  12. ^ a b c d e f g "Table 3.1," in Weishampel, et al. (2004). Page 50.
  13. ^ a b c "Table 3.1," in Weishampel, et al. (2004). Page 49.
  14. ^
    ISSN 0272-4634
    .
  15. ^ "Table 17.1," in Weishampel, et al. (2004). Page 368.
  16. ^ "Table 17.1," in Weishampel, et al. (2004). Page 367.
  17. ISBN 978-3-030-56453-7
    , retrieved 2024-02-13
  18. ISSN 0077-7749
    .
  19. ISBN 978-3-030-49753-8
    , retrieved 2024-03-29
  20. S2CID 129792355
    .

Bibliography
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