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James B Riding - One of the best experts on this subject based on the ideXlab platform.
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the biostratigraphy of the upper pliensbachian toarcian lower jurassic sequence at ilminster somerset
Journal of Micropalaeontology, 2009Co-Authors: Ian Boomer, Kevin N Page, Paul R Bown, F M D Lowry, A R Lord, James B RidingAbstract:Temporary road sections for the A303 bypass at Ilminster, Somerset, revealed Upper Pliensbachian and Toarcian sediments from an alternating limestone–marl facies, in marked contrast to the limestone-dominated Dorset coast succession. The Lithostratigraphy is described, with the standard ammonite zonation providing chronostratigraphical correlation. The uppermost Pliensbachian (Spinatum Chronozone) and much of the Toarcian (Serpentinum, Bifrons, Variabilis, Thouarsense and Pseudoradiosa chronozones) of the classic Dorset coast Lower Jurassic sequence are represented by the Beacon Limestone Formation, formerly the ‘Junction Bed’ (a highly condensed carbonate deposit). The Tenuicostatum Chronozone is largely missing from the sequence. Elsewhere in southern and eastern England this interval is poorly or rarely exposed. The argillaceous units have yielded rich microfaunas and -floras (foraminifera, ostracods, calcareous nannofossils and palynomorphs), the biostratigraphical distributions of which are analysed and discussed in relation to contemporary evolutionary patterns and other UK records. This study provides an insight into the micro-biostratigraphy of the Late Pliensbachian to Toarcian interval for onshore southern England.
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the biostratigraphy of the upper pliensbachian toarcian lower jurassic sequence at ilminster somerset
Journal of Micropalaeontology, 2009Co-Authors: Ian Boomer, Kevin N Page, Paul R Bown, F M D Lowry, A R Lord, James B RidingAbstract:Temporary road sections for the A303 bypass at Ilminster, Somerset, revealed Upper Pliensbachian and Toarcian sediments from an alternating limestone–marl facies, in marked contrast to the limestone-dominated Dorset coast succession. The Lithostratigraphy is described, with the standard ammonite zonation providing chronostratigraphical correlation. The uppermost Pliensbachian (Spinatum Chronozone) and much of the Toarcian (Serpentinum, Bifrons, Variabilis, Thouarsense and Pseudoradiosa chronozones) of the classic Dorset coast Lower Jurassic sequence are represented by the Beacon Limestone Formation, formerly the ‘Junction Bed’ (a highly condensed carbonate deposit). The Tenuicostatum Chronozone is largely missing from the sequence. Elsewhere in southern and eastern England this interval is poorly or rarely exposed. The argillaceous units have yielded rich microfaunas and -floras (foraminifera, ostracods, calcareous nannofossils and palynomorphs), the biostratigraphical distributions of which are analysed and discussed in relation to contemporary evolutionary patterns and other UK records. This study provides an insight into the micro-biostratigraphy of the Late Pliensbachian to Toarcian interval for onshore southern England.
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pre devensian Lithostratigraphy of shallow marine fluvial and glacial sediments in northern east anglia
2008Co-Authors: Jonathan R Lee, James B Riding, S M Pawley, James Rose, B S P Moorlock, Richard J O Hamblin, Ian Candy, Rene W Barendregt, S J Booth, Anna HarrisonAbstract:Historically, a wide range of stratigraphical approaches have been applied to examining the Early and Middle Pleistocene succession of northern East Anglia including conventional biostratigraphy and Lithostratigraphy (Boswell, 1916; Banham, 1968; Perrin et al., 1979; West, 1980a; Bowen et al., 1986; Preece and Parfitt, 2000). Both of these approaches underpin the ‘official’ stratigraphic classification for Quaternary Deposits in the British Isles, published first in the mid-seventies (Mitchell et al., 1973), and then revised in the late-nineties (Bowen, 1999a).
Hayes, Reilly F - One of the best experts on this subject based on the ideXlab platform.
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Modeling the dynamics of a late triassic vertebrate extinction: The adamanian/revueltian faunal turnover, Petrified Forest National Park, Arizona, USA
'Geological Society of America', 2020Co-Authors: Hayes, Reilly F, Puggioni Gavino, Parker, William G., Tiley, Catherine S., Bednarick, Amanda L., Fastovsky, David E.Abstract:The coincidence of a diverse vertebrate assemblage with a high-precision geochronology and Lithostratigraphy in Petrified Forest National Park (Arizona, USA) allows Bayesian quantification of the dynamics of a Late Triassic vertebrate extinction and replacement, the Adamanian/ Revueltian (A/R) faunal turnover. This approach uniquely identifies probabilities for the tempo of the replacement of the Adamanian assemblage by that of the Revueltian, precisely tracking the turnover. While the method does not designate the moment of extinction, there is a negligible probability that all Adamanian extinctions, as well as all Revueltian originations, are synchronous. A protracted A/R turnover is incompatible with the geologically instantaneous Manicouagan impact (215.4 ± 0.20 Ma; Quebec, Canada) as a dominant causal mechanism. This analytical framework constitutes a flexible means of reconstructing biotic turnover in a variety of deep time contexts
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Dynamics of the Late Triassic Adamanian-Revueltian Extinction, Petrified Forest National Park, Az
DigitalCommons@URI, 2019Co-Authors: Hayes, Reilly FAbstract:In the Late Triassic of Petrified Forest National Park (PEFO), AZ, the coincidence of high-precision geochronology and robust Lithostratigraphy allows an adaption of the Bayesian statistical approaches of Haslett and Parnell (2008) and Alroy (2014) to quantify the dynamics of a Late Triassic vertebrate extinction and replacement, the Adamanian-Revueltian (A-R) faunal turnover. This analysis indicates negligible probability of synchroneity of Adamanian extinctions and Revueltian originations. This protracted reconstruction of the A-R turnover decouples the event from the geologically instantaneous Manicouagan impact (215.4 +/- 0.20 Ma; Québec, Canada), previously implicated as a causal mechanism
Fastovsky, David E. - One of the best experts on this subject based on the ideXlab platform.
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Modeling the dynamics of a late triassic vertebrate extinction: The adamanian/revueltian faunal turnover, Petrified Forest National Park, Arizona, USA
'Geological Society of America', 2020Co-Authors: Hayes, Reilly F, Puggioni Gavino, Parker, William G., Tiley, Catherine S., Bednarick, Amanda L., Fastovsky, David E.Abstract:The coincidence of a diverse vertebrate assemblage with a high-precision geochronology and Lithostratigraphy in Petrified Forest National Park (Arizona, USA) allows Bayesian quantification of the dynamics of a Late Triassic vertebrate extinction and replacement, the Adamanian/ Revueltian (A/R) faunal turnover. This approach uniquely identifies probabilities for the tempo of the replacement of the Adamanian assemblage by that of the Revueltian, precisely tracking the turnover. While the method does not designate the moment of extinction, there is a negligible probability that all Adamanian extinctions, as well as all Revueltian originations, are synchronous. A protracted A/R turnover is incompatible with the geologically instantaneous Manicouagan impact (215.4 ± 0.20 Ma; Quebec, Canada) as a dominant causal mechanism. This analytical framework constitutes a flexible means of reconstructing biotic turnover in a variety of deep time contexts
Victoria B Ershova - One of the best experts on this subject based on the ideXlab platform.
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Lithostratigraphy and geochemistry of upper vendian lower cambrian deposits in the northeastern baltic monocline
Stratigraphy and Geological Correlation, 2017Co-Authors: Victor N. Podkovyrov, A B Kuznetsov, A V Maslov, Victoria B ErshovaAbstract:The results of investigations of Upper Vendian‒Lower Cambrian deposits in the northeastern part of the Baltic monocline specify views on the evolution of depositional environments of sedimentary successions constituting the basal part of the sedimentary cover in inner areas of the northwestern East European Platform. It is shown that the Late Vendian and initial Cambrian were characterized by the consecutive influx of relatively mature terrigenous detrital material that originated from both the weathering crust of the Baltic Shield and new sources. Its deposition was interrupted by notable, although likely asynchronous, hiatuses, which are registered at the base of the Upper Vendian Vasileostrovskaya and Voronkovo formations and Lower Cambrian Lomonosov Formation. In the Late Vendian, sedimentary material was transported from the Baltic Shield, while beginning from the initial Early Cambrian the additional contribution to the formation of the sedimentary cover of the Baltic monocline was provided by coarse-grained sedimentary material from the Timan margin of the Baltica as follows from U‒Pb isotopic ages obtained for detrital zircons. At the same time, lithogeochemical parameters of fine-grained rocks experienced no substantial changes.
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Lithostratigraphy and geochemistry of Upper Vendian‒Lower Cambrian deposits in the northeastern Baltic monocline
Stratigraphy and Geological Correlation, 2017Co-Authors: Victor N. Podkovyrov, A B Kuznetsov, A V Maslov, Victoria B ErshovaAbstract:The results of investigations of Upper Vendian‒Lower Cambrian deposits in the northeastern part of the Baltic monocline specify views on the evolution of depositional environments of sedimentary successions constituting the basal part of the sedimentary cover in inner areas of the northwestern East European Platform. It is shown that the Late Vendian and initial Cambrian were characterized by the consecutive influx of relatively mature terrigenous detrital material that originated from both the weathering crust of the Baltic Shield and new sources. Its deposition was interrupted by notable, although likely asynchronous, hiatuses, which are registered at the base of the Upper Vendian Vasileostrovskaya and Voronkovo formations and Lower Cambrian Lomonosov Formation. In the Late Vendian, sedimentary material was transported from the Baltic Shield, while beginning from the initial Early Cambrian the additional contribution to the formation of the sedimentary cover of the Baltic monocline was provided by coarse-grained sedimentary material from the Timan margin of the Baltica as follows from U‒Pb isotopic ages obtained for detrital zircons. At the same time, lithogeochemical parameters of fine-grained rocks experienced no substantial changes.
Ian Boomer - One of the best experts on this subject based on the ideXlab platform.
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the biostratigraphy of the upper pliensbachian toarcian lower jurassic sequence at ilminster somerset
Journal of Micropalaeontology, 2009Co-Authors: Ian Boomer, Kevin N Page, Paul R Bown, F M D Lowry, A R Lord, James B RidingAbstract:Temporary road sections for the A303 bypass at Ilminster, Somerset, revealed Upper Pliensbachian and Toarcian sediments from an alternating limestone–marl facies, in marked contrast to the limestone-dominated Dorset coast succession. The Lithostratigraphy is described, with the standard ammonite zonation providing chronostratigraphical correlation. The uppermost Pliensbachian (Spinatum Chronozone) and much of the Toarcian (Serpentinum, Bifrons, Variabilis, Thouarsense and Pseudoradiosa chronozones) of the classic Dorset coast Lower Jurassic sequence are represented by the Beacon Limestone Formation, formerly the ‘Junction Bed’ (a highly condensed carbonate deposit). The Tenuicostatum Chronozone is largely missing from the sequence. Elsewhere in southern and eastern England this interval is poorly or rarely exposed. The argillaceous units have yielded rich microfaunas and -floras (foraminifera, ostracods, calcareous nannofossils and palynomorphs), the biostratigraphical distributions of which are analysed and discussed in relation to contemporary evolutionary patterns and other UK records. This study provides an insight into the micro-biostratigraphy of the Late Pliensbachian to Toarcian interval for onshore southern England.
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the biostratigraphy of the upper pliensbachian toarcian lower jurassic sequence at ilminster somerset
Journal of Micropalaeontology, 2009Co-Authors: Ian Boomer, Kevin N Page, Paul R Bown, F M D Lowry, A R Lord, James B RidingAbstract:Temporary road sections for the A303 bypass at Ilminster, Somerset, revealed Upper Pliensbachian and Toarcian sediments from an alternating limestone–marl facies, in marked contrast to the limestone-dominated Dorset coast succession. The Lithostratigraphy is described, with the standard ammonite zonation providing chronostratigraphical correlation. The uppermost Pliensbachian (Spinatum Chronozone) and much of the Toarcian (Serpentinum, Bifrons, Variabilis, Thouarsense and Pseudoradiosa chronozones) of the classic Dorset coast Lower Jurassic sequence are represented by the Beacon Limestone Formation, formerly the ‘Junction Bed’ (a highly condensed carbonate deposit). The Tenuicostatum Chronozone is largely missing from the sequence. Elsewhere in southern and eastern England this interval is poorly or rarely exposed. The argillaceous units have yielded rich microfaunas and -floras (foraminifera, ostracods, calcareous nannofossils and palynomorphs), the biostratigraphical distributions of which are analysed and discussed in relation to contemporary evolutionary patterns and other UK records. This study provides an insight into the micro-biostratigraphy of the Late Pliensbachian to Toarcian interval for onshore southern England.
