Lameta Formation | |
---|---|
Stratigraphic range: Maastrichtian ~ | |
Type | Geological formation |
Underlies | Intertrappean Beds, Deccan Traps deposits |
Overlies | Jabalpur Group or Precambrian Basement |
Area | 5,000 km2 (1,900 sq mi) |
Thickness | Variable, typically 18–45 m (59–148 ft) |
Lithology | |
Primary | Claystone, sandstone limestone |
Other | Conglomerate |
Location | |
Coordinates | 23°12′N80°00′E / 23.2°N 80.0°E |
Approximate paleocoordinates | 24°42′S63°12′E / 24.7°S 63.2°E |
Region | Western India |
Country | India |
Extent | Madhya Pradesh, Gujarat, Maharashtra, Andhra Pradesh, Telangana |
Type section | |
Named for | Lameta Ghat |
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.
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]
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]
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] Synapsids are also known form the formation, such as the possibly late surviving Avashishta ,possibly the last known non- mammalian synapsid the possibly youngest known stegosaurian ichnogenus Deltapodus , madtsoiid snakes and other fossils.
Color key
| Notes Uncertain or tentative taxa are in small text; |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Ankylosauria? | Indeterminate | Rahioli | Isolated vertebrae, scapulocoracoid, humerus, femur, and several armor fragments such as hollow lateral spikes and solid dorsal scutes. [7] | Described as a nodosaurid, but the limb bones are titanosaurian. [8] | ||
Brachypodosaurus | B. gravis | Chota Simla Hill | "Humerus." [9] | May not be dinosaurian | ||
Ceratopsia? | Indeterminate | Kheda | Horncore base. | Originally described as a ceratopsian horncore, [10] but likely represents a theropod limb element or a dorsal rib of a theropod or a titanosauriform. [11] | ||
Deltapodus [12] | sp. | Jetholi | Solitary footprint. | A Possible Late Cretaceous Stegosaur, Like Dravidosaurus. | ||
Hypsilophodontidae? [13] | Indeterminate. | Vikarabad. | Teeth. | Hypsilophodontidae is not a natural grouping. | ||
Ornithischia [14] | Indeterminate | Kheda | Braincase. | Indeterminate Ornithischian. | ||
Spheroolithus ? | sp. | Polgaon, Tidkepar | Egg fossils. | Questionably assigned to this genus [15] |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Ikqaumishan | I. smqureshi | Temple Hill, Rahioli | ||||
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." [16] | A titanosaur. | ||
Qaikshaheen | Q. masoomniazi | |||||
Pakisaurus | P. balochistani | Temple Hill, Rahioli | A femur bone | A titanosaur. | ||
Titanosaurus | T. blanfordi |
| Caudal vertebrae. [17] | A dubious genus of titanosaur. [18] | ||
T. indicus | Pisdura Hill | Teeths, Caudal vertebrae and chevron. [19] | ||||
Megaloolithus [20] | M. cylindricus | Chui Hill, Bara Simla, Nand region, Pavan, Ghorpend, Bagh Caves, Dhar, Indwan, Kadwal, Dholiya Raipuriya village, Akhada village, Jhaba village, Padlya village, Jhabua, Dohad, Jhalod, Garadi, Kheda, Rahioli, Dholi Dungri. | Sauropod egg fossils | |||
M. dhoridungriensis | ||||||
M. jabalpurensis | ||||||
M. khempurensis | ||||||
M. megadermus | ||||||
M. problematica | ||||||
M. walpurensis | ||||||
M. sp. | ||||||
Titanosauriform [21] | Indeterminate | Ukala. | Dorsal vertebrae, parts of illia and pelvis and limb bones. | A titanosauriform. | ||
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Compsosuchus | C. solus | Bara Simla | "Vertebrae" | Previously considered a Noasaurid now considered an indeterminate Abelisaurid [22] | ||
Indosaurus | I. matleyi | Bara Simla | Partial skeleton, including a partial skull. [23] | An abelisaur. | ||
Indosuchus | I. raptorius | Bara Simla | Cranial remains, including two braincases, as well as a nearly complete skeleton. [23] | An abelisaur. | ||
Ornithomimoides | O. barasimlensis | Bara Simla | "Vertebrae." [24] | An abelisaurid [25] | ||
O. mobilis | Bara Simla | "Vertebrae" [24] | ||||
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. | ||
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Laevisuchus | L. indicus | Bara Simla | Only vertebrae. [23] | A noasaurid. | ||
Noasaurinae | Indeterminate | Pisdura Hill | A partial dentary [25] | A noasaurid noasaurine. |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Coeluroides | C. largus | Bara Simla | "Isolated vertebrae." [24] | A Indeterminate theropod also known from Dabrazhin Formation of Kazakhstan | ||
Dryptosauroides | D. grandis | Bara Simla | "Vertebrae." [24] | |||
Ellipsoolithus [26] | E. khedaensis | Kheda | Eggs | Theropod egg fossils. | ||
Jubbulpuria | J. tenuis | Bara Simla | "Vertebrae." [24] | Likely junior synonym of Laevisuchus [25] | ||
Lametasaurus | L. indicus | Bara Simla | "Sacrum, ilia, tibia." [24] "Sacrum, ilia, tibia, spines, armor." [27] | |||
? Megalosaurus | Referred to as the 'E' morphotype | Rahioli | A solitary tooth. [28] | Originally identified as belonging to Megalosaurus, however may instead represent a troodontid. [29] | ||
Orthogoniosaurus | O. matleyi | Bara Simla | "Tooth" [24] | |||
Ornithomimidae [30] | indet | Bara Simla | A probable Indian Ornithomimid. | |||
Trachoolithus [31] | T. faticanus | Bara Simla | Eggs. | Theropod egg fossils. |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Madtsoia | M. pisdurensis [32] | Pidura Hill | Upper | A madtsoiid snake. | ||
Sanajeh | S. indicus | Dholi Dungri | A skull, precloaca vertebrae and ribs. | A madtsoiid snake. |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Dyrosauridae [33] [13] [34] | Indeterminate. | Kisalpuri and Vikarabad. | Vertebrae, eggs and teeth. | Non-Phosphatosaurinae Dyrosaurid Crocodylomorphs. | ||
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Jainemys | J. pisdurensis | Pisdura hill | A bothremydid side-necked turtle. | |||
Pelomedusidae [35] [36] | Indeterminate | A turtle. |
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
---|---|---|---|---|---|---|
Avashishta | A. bacharamensis [37] | Bacharam | A Haramiyida Mammal. | |||
Genus | Species | Location | Notes |
---|---|---|---|
Mollusca | Indeterminate | ||
Gastropoda | Indeterminate | ||
Viviparus | V. normalis | ||
Physa | P. sp. | ||
Paludina | P. deccanensis | ||
Lymnaea | L. subulata | ||
Unio | U. sp. | ||
Rajasaurus is a genus of carnivorous abelisaurid theropod dinosaur from the Late Cretaceous of India, containing one species: Rajasaurus narmadensis. The bones were excavated from the Lameta Formation in the Gujarat state of Western India, probably inhabiting what is now the Narmada River Valley. It was formally described by palaeontologist Jeffrey A. Wilson and colleagues in 2003 based on a partial skeleton comprising the braincase, spine, hip bone, legs, and tail–a first for an Indian theropod. The dinosaur likely measured 6.6 metres (22 ft), and had a single horn on the forehead which was probably used for display and head-butting. Like other abelisaurids, Rajasaurus was probably an ambush predator.
Abelisauridae is a family of ceratosaurian theropod dinosaurs. Abelisaurids thrived during the Cretaceous period, on the ancient southern supercontinent of Gondwana, and today their fossil remains are found on the modern continents of Africa and South America, as well as on the Indian subcontinent and the island of Madagascar. Isolated teeth were found in the Late Jurassic of Portugal, and the Late Cretaceous genera Tarascosaurus, Arcovenator and Caletodraco have been described in France. Abelisaurids possibly first appeared during the Jurassic period based on fossil records, and some genera survived until the end of the Mesozoic era, around 66 million years ago.
Dravidosaurus is a controversial taxon of Late Cretaceous reptiles, variously interpreted as either a ornithischian dinosaur or a plesiosaur. The genus contains a single species, D. blanfordi, known from mostly poorly preserved fossils from the Coniacian of southern India.
Deltadromeus is a genus of theropod dinosaur from the Aoufous Formation of Morocco.
Brachypodosaurus is a dubious genus of dinosaur, possibly an ornithischian, from the Late Cretaceous Lameta Formation (Maastrichtian) in India.
Indosaurus is a genus of dubious carnivorous theropod dinosaur that lived in what is now India, about 69 to 66 million years ago during the Maastrichtian division of the Late Cretaceous.
Compsosuchus is a dubious genus of abelisauroid dinosaur from the Late Cretaceous Lameta Formation of India.
Isisaurus is a genus of titanosaurian dinosaur from the Late Cretaceous Lameta Formation of India and Pab Formation of Pakistan. The genus contains a single species, Isisaurus colberti.
Jubbulpuria is the name given to a dubious genus of small dinosaur from the Late Cretaceous Lameta Formation of India.
Laevisuchus is a genus of theropod dinosaur from the Late Cretaceous. Its remains were discovered by Charles Alfred Matley near Jabalpur in Maastrichtian "Carnosaur Bed" deposits in the Lameta Formation in Madhya Pradesh, central India, and were named and described by paleontologists Friedrich von Huene and Matley in 1933.
Ornithomimoides is a dubious genus of theropod dinosaur, from the Late Cretaceous Lameta Formation of India. Two species have been identified, the type species O. mobilis and O. barasimlensis, were named by von Huene in 1932 and were described by Matley in 1933 though they are known only from isolated vertebrae. O. barasimlensis is known from five dorsal vertebrae, and O. mobilis from four smaller vertebrae, found at the same location.
The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the Late Cretaceous, between 79 and 75.3 million years ago, corresponding to the "Judithian" land vertebrate age. It was laid down during the same time period as portions of the Two Medicine Formation of Montana and the Oldman Formation of Alberta. It is an historically important formation, explored by early American paleontologists such as Edward Drinker Cope, who named several dinosaurs from scrappy remains found here on his 1876 expedition. Modern work has found nearly complete skeletons of the hadrosaurid Brachylophosaurus.
Madtsoiidae is an extinct family of mostly Gondwanan snakes with a fossil record extending from early Cenomanian to late Pleistocene strata located in South America, Africa, India, Australia and Southern Europe. Madtsoiidae include very primitive snakes, which like extant boas and pythons would likely dispatch their prey by constriction. Genera include some of the longest snakes known such as Vasuki, measuring at least 11–15 metres (36–49 ft) long, and the Australian Wonambi and Yurlunggur. As a grouping of basal forms the composition and even the validity of Madtsoiidae is in a state of flux as new pertinent finds are described, with more recent evidence suggesting that it is paraphyletic as previously defined.
The Maevarano Formation is a Late Cretaceous sedimentary rock formation found in the Mahajanga Province of northwestern Madagascar. It is most likely Maastrichtian in age, and records a seasonal, semiarid environment with rivers that had greatly varying discharges. Notable animal fossils recovered include the theropod dinosaur Majungasaurus, the early bird Vorona, the paravian Rahonavis, the titanosaurian sauropod Rapetosaurus, and the giant frog Beelzebufo.
The Intertrappean Beds are a Late Cretaceous and early Paleogene geologic unit in India. These beds are found as interbeds between Deccan Traps layers, including the slightly older Lameta Formation. They consist a number of different subgroups and formations, and span the Cretaceous–Paleogene boundary.
The Takli Formation is a Maastrichtian geologic formation in India. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.
Rahiolisaurus is a genus of abelisaurid theropod dinosaur which existed in India during the Late Cretaceous period. It was described in 2010, based on fossils recovered from the Lameta Formation in the Indian state of Gujarat. These fossils include elements from at least seven different individuals and are believed to have been from the Maastrichtian stage, sometime between 70 and 66 million years ago, making it one of the last non-avian dinosaurs known in the fossil record. Despite representing a variety of different growth stages, all recovered fossils from the locality indicate a single species, the type species Rahiolisaurus gujaratensis.
Camarillasaurus is a genus of theropod dinosaur from the Early Cretaceous period (Barremian) of Camarillas, Teruel Province, in what is now northeastern Spain. Described in 2014, it was originally identified as a ceratosaurian theropod, but later studies suggested affinities to the Spinosauridae. If it does represent a spinosaur, Camarillasaurus would be one of several spinosaurid taxa known from the Iberian peninsula, the others being Iberospinus, Protathlitis, Baryonyx, Riojavenatrix, and Vallibonavenatrix.
Sunil Bajpai is the Chair Professor of Vertebrate Paleontology in the Department of Earth Sciences, Indian Institute of Technology Roorkee. He is in service as a professor at IIT Roorkee since 1st January 1996 till 30 September 2026. He also served as the director of the Birbal Sahni Institute of Palaeosciences from January 2013 to July 2018.
Avashishta bacharamensis is an extinct genus of a possibly late surviving haramiyid from the Maastrichtian Lameta formation of India. It is known from a solitary molariform tooth. It might represent the last known non-mammalian synapsid.