Sedimentology of a muddy alluvial deposit: Triassic Denwa Formation, India

Ghosh, Parthasarathi; Sarkar, Suman; Maulik, Pradip K.

doi:10.1016/j.sedgeo.2006.01.002

Cited by 59 publications

(53 citation statements)

References 70 publications

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“…All these features suggest bogging down of the paracyclotosaurids in shallow water (Bandyopadhyay et al, 2002). The presence of muddy heterolithic sheets along with wavy laminations in the siltstones, together with the typical fishtemnospondyl assemblage and unionid valves, indicates flood plain ponds (Ghosh et al, 2006). It may be noted that the paracyclotosaurids were a skull-dominated assemblage in association with a subordinate amount of disarticulated postcranial elements, suggesting that most of the postcranial elements were winnowed out and the heavier cranial material was preserved as residual assemblage.…”

Section: Paracyclotosauridaementioning

confidence: 96%

“…On the basis of contrasting lithofacies and distinctive sedimentary structures, the Denwa Formation is divided into a sandstone dominated Lower Denwa unit (120 m) and a mudstone dominated Upper Denwa unit (180 m). The paracyclotosaurids were collected from a heterolithic sand-mud facies of the Upper Denwa unit, which has been interpreted as deposited by sandy braided channels with associated flood plains (Ghosh et al, 2006).…”

Section: Paracyclotosauridaementioning

confidence: 99%

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Preliminary observations on the bone microstructure, growth patterns, and life habits of some Triassic temnospondyls from India

Mukherjee

Ray

Sengupta

2010

Journal of Vertebrate Paleontology

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ABSTRACT-The osteohistology including bone cross-sectional geometry of skeletal elements such as the limb bones, ribs, and intercentra of three Triassic temnospondyl taxa from India were examined to reveal varied bone microstructure and differing growth patterns. The Early Triassic trematosaurid examined is characterized by a change in tissue type from a wellvascularized fibrolamellar bone early in ontogeny to peripheral lamellar bone and lines of arrested growth later in ontogeny, suggesting a fast initial growth followed by a slow and intermittent growth later in life. In contrast, the Middle Triassic paracyclotosaurid and the Late Triassic chigutisaurid examined had a cyclical, overall slow growth, as evidenced from predominance of lamellar bone in the cortex. It is hypothesized that the rapid growth of the trematosaurids was an attempt to stabilize the ecosystem after the Permo-Triassic extinction event. Fibrolamellar bone tissue is described for the first time in a Triassic temnospondyl. Bone cross-sectional geometry, low-to-average cortical porosity, and other parameters imply that the members of the Early and Middle Triassic taxa recovered from India retained a high level of terrestriality. The high cortical porosity and extensive medullary spongiosa suggest that the Late Triassic chigutisaurids had a semi-aquatic or aquatic life style. The varying cortical thickness of the limb bones in paracyclotosaurids may be attributed to different biomechanical constraints.

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Section: Paracyclotosauridaementioning

confidence: 96%

Section: Paracyclotosauridaementioning

confidence: 99%

Preliminary observations on the bone microstructure, growth patterns, and life habits of some Triassic temnospondyls from India

Mukherjee

Ray

Sengupta

2010

Journal of Vertebrate Paleontology

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“…Interpretation FA3 is interpreted to reflect deposition within low-energy proximal to distal floodplain settings lateral to a major fluvial channel (Allen 1963;Miall, 1996;Ghosh et al, 2006). The range of depositional microenvironments associated with FA3 is interpreted to include: weakly-developed paleosols, levee deposits and channel infill within oxbow lakes, small ephemeral to perennial billabongs (ponds).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Investigating the stratigraphy and palaeoenvironments for a suite of newly discovered mid-Cretaceous vertebrate fossil-localities in the Winton Formation, Queensland, Australia

Tucker

Roberts

Darlington

et al. 2017

Sedimentary Geology

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Please cite this article as: Tucker, Ryan T., Roberts, Eric M., Darlington, Vikie, Salisbury, Steven W., Investigating the stratigraphy and palaeoenvironments for a suite of newly discovered mid-Cretaceous vertebrate fossil-localities in the Winton Formation, Queensland, Australia, Sedimentary Geology (2017), doi:10.1016/j.sedgeo.2017 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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“…Ghosh et al, 2006). Las macroformas de canales multiepisódicos indican la elevación del 'thalweg', esto puede llegar a ser la respuesta a la agradación vertical de la superficie del cinturón de canal (Farrell, 2001).…”

Section: Spunclassified

Sedimentología y estratigrafía de alta resolución del subgrupo río Neuquén (Cretácico Superior) departamento confluencia, provincia de Neuquén, Argentina

Sánchez

Asurmendi

Armas

2014

Andgeo

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RESUMEN.En el sector centro-este de la Cuenca Neuquina, suroeste de Neuquén, Patagonia Argentina, el Subgrupo Río Neuquén de origen continental ha sido dividido en dos secuencias estratigráficas incompletas (SI y SII) sobre la base de discontinuidades que limitan arreglos de litofacies y elementos arquitecturales característicos. Parte de la sucesión (Formación Portezuelo-SI) se formó a partir de sistemas fluviales de baja y alta sinuosidad que drenaban hacia el noreste. La acreción lateral y oblicua es un rasgo importante de los sistemas de alta energía con carga mixta. Los depósitos de planicie de inundación dominan la estratigrafía, contribuyendo con más del 45% de los sedimentos. La Formación Plottier (SII) se acumuló a partir de un sistema de baja sinuosidad perenne con un buen desarrollo de los depósitos de planicie aluvial con eventos de inundaciones. La unidad se acumuló sobre una topografía con un gradiente general hacia el este-noreste. La arquitectura aluvial y patrones de apilamiento en el Subgrupo Río Neuquén estuvo controlada por la combinación de factores alogénicos, el más significativo fue la tectónica seguida por el clima. La sucesión del Cretácico Tardío en la cuenca de antepaís andina, depositada en la cuenca periférica, consiste de ciclos tectónicos que comprenden dos componentes: estratos depositados en una cuenca subalimentada (Formación Portezuelo, AA-SI) y sedimentación en una cuenca sobrealimentada sin un abultamiento periférico definido topográficamente (Formación Plottier, BA-SII). ABSTRACT. Sedimentology and high resolution stratigraphy of Río Neuquén Subgroup (Upper Cretaceous) department Confluence, Province of Neuquén, Argentina.The Upper Cretaceous exposid in the northeastern part of the Neuquén Basin, southeast of Neuquén, Argentina. Río Neuquén Subgroup of continental origin, has been divided into two incomplete stratigraphic sequence units (SI y SII) on the basis of lithofacies assemblages and architectural elements. Parts of the succession (Portezuelo Formation SI) formed in northeasward-draining low and high sinuosity fluvial systems. Those are analyzed in detail in terms of macroform-scale and stratigraphic-level architecture to assess fluvial styles and the evolution of non-marine depositional environments. Lateral and oblique accretion is a significant process of deposition in high-energy systems with mixed load. The overbank deposits dominate the floodplain stratigraphy; they contribute more than 45% of floodplain sediments. The Plottier Formation (SII) was accumulated from a low sinuosity perennial system with well developed deposits of alluvial plain with flood events. The unit was accumulated on topographic slopes dipping from west-southwest to east-northeast. The alluvial architecture and stacking patterns in the Río Neuquén Subgroup were controlled by a combination of allogenic factors, most significantly tectonics followed by climate. The Upper Cretaceous succession in the Andean foreland basin, deposited in a backbulge zone, consists of tectonically-driven cycles ...

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Sedimentology of a muddy alluvial deposit: Triassic Denwa Formation, India

Cited by 59 publications

References 70 publications

Preliminary observations on the bone microstructure, growth patterns, and life habits of some Triassic temnospondyls from India

Preliminary observations on the bone microstructure, growth patterns, and life habits of some Triassic temnospondyls from India

Investigating the stratigraphy and palaeoenvironments for a suite of newly discovered mid-Cretaceous vertebrate fossil-localities in the Winton Formation, Queensland, Australia

Sedimentología y estratigrafía de alta resolución del subgrupo río Neuquén (Cretácico Superior) departamento confluencia, provincia de Neuquén, Argentina

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