Palaeontological and sedimentological observations on nonmarine Lameta Formation (Upper Cretaceous) of Maharashtra, India: their palaeoecological and palaeoenvironmental significance

Mohabey, D. M.; Udhoji, S. G.; Verma, Kamlesh

doi:10.1016/0031-0182(93)90108-u

Cited by 72 publications

(53 citation statements)

References 11 publications

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“…Only six of the ten other known osteodermbearing titanosaurs are derived from well-documented palaeoenvironmental contexts 4 . These taxa also inhabited seasonal, semi-arid to arid palaeoenvironments [36][37][38][39][40][41] . Under these palaeoenvironmental conditions, we propose that osteoderms may have provided an important, adaptive, integumentary mineral reservoir throughout Rapetosaurus life history (and perhaps in other osteoderm-bearing titanosaurs).…”

Section: Discussionmentioning

confidence: 99%

Sauropod dinosaur osteoderms from the Late Cretaceous of Madagascar

et al. 2011

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osteoderms are bones embedded within the dermis, and are common to select members of most major tetrapod lineages. The largest known animals that bear osteoderms are members of Titanosauria, a diverse clade of sauropod dinosaurs. Here we report on two titanosaur osteoderms recovered from the upper Cretaceous maevarano Formation of madagascar. Each osteoderm was discovered in association with a partial skeleton representing a distinct ontogenetic stage of the titanosaur Rapetosaurus krausei. Combined, these specimens provide novel insights into the arrangement and function of titanosaur osteoderms. Taphonomic data confirm that Rapetosaurus developed only limited numbers of osteoderms in its integument. The adult-sized osteoderm is the most massive integumentary skeletal element yet discovered, with an estimated volume of 9.63 litres. uniquely, this specimen possesses an internal cavity equivalent to more than half its total volume. Large, hollow osteoderms may have functioned as mineral stores in fecund, rapidly growing titanosaurs inhabiting stressed environments.

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Section: Discussionmentioning

confidence: 99%

Sauropod dinosaur osteoderms from the Late Cretaceous of Madagascar

et al. 2011

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“…These deposits are known for their wealth of fossils, including dinosaur bones, coprolites, egg-shell fragments, remains of turtles, frogs, fishes and mammals, as well as macro-and micro-floral remains [23][24][25] . Continued sampling 22,26,27 both from Lameta Formation sediments and associated titanosaurid sauropod coprolites from Pisdura (east and south sections) and sediments of the Lameta Formation at Dhamni, Piraya and Polgaon has yielded grass pollen and additional leaf cuticle with embedded grass silica short cell (GSSC) phytoliths similar to those found in oryzoid grasses (often referred to as 'oryzoid' silica bodies 28 ). Here we report on these newly recovered fossil cuticles and associated phytoliths (referred to as morphotypes Changii indicum and Tateokai deccana) and use them to suggest a different scenario and timing for the emergence and diversification of the rice tribe than what is widely assumed among evolutionary biologists.…”

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confidence: 99%

Late Cretaceous origin of the rice tribe provides evidence for early diversification in Poaceae

Prasad¹,

et al. 2011

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Rice and its relatives are a focal point in agricultural and evolutionary science, but a paucity of fossils has obscured their deep-time history. Previously described cuticles with silica bodies (phytoliths) from the Late Cretaceous period (67-65 ma) of India indicate that, by the latest Cretaceous, the grass family (Poaceae) consisted of members of the modern subclades PACmAD (Panicoideae-Aristidoideae-Chloridoideae-micrairoideae-ArundinoideaeDanthonioideae) and BEP (Bambusoideae-Ehrhartoideae-Pooideae), including a taxon with proposed affinities to Ehrhartoideae. Here we describe additional fossils and show that, based on phylogenetic analyses that combine molecular genetic data and epidermal and phytolith features across Poaceae, these can be assigned to the rice tribe, oryzeae, of grass subfamily Ehrhartoideae. The new oryzeae fossils suggest substantial diversification within Ehrhartoideae by the Late Cretaceous, pushing back the time of origin of Poaceae as a whole. These results, therefore, necessitate a re-evaluation of current models for grass evolution and palaeobiogeography.

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“…Lithologically, the Lameta sediments are mostly arenaceous, with well-developed calcrete profi les and overbank, lacustrine, paludal, and channel facies (Tandon et al 1995(Tandon et al , 1998Tandon 2002;Tandon and Andrews 2001;Mohabey et al 1993;Mohabey and Udhoji 1996). In contrast, the intertrappean sediments are mostly argillaceous, forming cherts, limestone and well-developed laterite profi les at higher stratigraphic levels.…”

Section: Discussionmentioning

confidence: 98%

“…In the N-D basin, the presence of numerous algal remains, charophytes, Oedogonium, Lecaniella, and Botrycoccus, fl oating ferns like Azolla, fi shes such as Clupids, Phareodus, Pycnodus, Lepidotes, Dasyatis, and Lepisosteus (Mohabey et al 1993;Mohabey and Udhoji 1996) and ostrocod assemblage, all collectively suggests a fresh water environment. The presence of Charophytes, Oedogonium, and Botryococcus clearly indicate the prevalence of alkaline shallow water conditions (Nichols 1973;Fritsch 1961) at some places.…”

Section: Palaeoenvironment Of the Deccan Volcanicsassociated Sedimentsmentioning

confidence: 98%

Palynoflora from deccan volcano-sedimentary sequence (Cretaceous-Palaeogene transition) of central India: implications for spatio-temporal correlation

Samant

Mohabey

2009

J Biosci

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The sedimentary beds associated with Deccan Continental Flood Basalt (DCFB) sequences exposed in the volcanic subprovinces of Jabalpur-Mandla-Chhindwara (JMC) regions of Madhya Pradesh and Nand-Dongargaon (N-D) basin and the adjoining areas to the west in Yeotmal-Nanded in Maharashtra were studied for their palynofloral analysis. The sediments were characterized palynologically and changes in the palynoflora are observed at different stratigraphic levels in a number of sections including several new intertrappean localities recorded in recent years. For the purpose of effective correlation of different subprovinces, palynofloras of some of the previously studied intertrappeans are also reviewed. Our studies suggest that before the start of the Deccan volcanic activity, the palynoflora found in the Lameta sediments, was dominated by gymnosperms-angiosperm association. The plant canopy consisted mainly of gymnosperms (Conifers and Podocarpaceae) whereas, the understory members were mostly of palms and herbs (Poaceae and Asteraceae). The eruption of Deccan volcanic flows severely affected the existing floral association and proved fatal for the well established plant community. The immediately overlying sediments associated with the earliest volcanic flows are dominated by pteridophytes and angiosperm taxa (Azolla cretacea, Aquilapollenites bengalensis, Ariadnaesporites sp., Gabonisporis vigourouxii and Triporoletes reticulatus). Higher up in the stratigraphic sequence, similar forms continued with simultaneous appearance of new taxa including Scabrastephanocolpites spp. At still higher stratigraphic levels, abundance of fungi especially the mycorrhizal fungi, concurrent with sharp decline in pollen/spore recovery was observed. In the culminating phase (i.e. Palaeocene) of Deccan volcanic history a new palynofloral assemblage of typical Palaeocene taxa (Dandotiaspora dilata, D. pseudoauriculata, D. plicata, Spinizonocolpites echinatus, Matanomadhiasulcites sp., and Lakiapollis ovatus) was encountered.

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Palaeontological and sedimentological observations on nonmarine Lameta Formation (Upper Cretaceous) of Maharashtra, India: their palaeoecological and palaeoenvironmental significance

Cited by 72 publications

References 11 publications

Sauropod dinosaur osteoderms from the Late Cretaceous of Madagascar

Sauropod dinosaur osteoderms from the Late Cretaceous of Madagascar

Late Cretaceous origin of the rice tribe provides evidence for early diversification in Poaceae

Palynoflora from deccan volcano-sedimentary sequence (Cretaceous-Palaeogene transition) of central India: implications for spatio-temporal correlation

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