The Experts below are selected from a list of 462 Experts worldwide ranked by ideXlab platform
Laura Piñuela - One of the best experts on this subject based on the ideXlab platform.
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New occurrences of the wood Protocupressinoxylon purbeckensis francis : implications for terrestrial biomes in southwestern Europe at the jurassic/cretaceous boundary
Palaeontology, 2010Co-Authors: Marc Philippe, Jean-paul Billon-bruyat, José C. García-ramos, Loïc Bocat, Bernard Gomez, Laura PiñuelaAbstract:Previously known from the Kimmeridgian-Portlandian of Dorset (UK) only, Protocupressinoxylon purbeckensis wood is reported here from the Kimmeridgian of Asturias (Spain) and Ajoie (Switzerland). The morphospecies taxonomy and nomenclature are discussed, and new supplementary illustrations are given. The P. purbeckensis tree was growing in dry strongly seasonal (tropophilous) environments, and the new occurrences suggest that such a climate prevailed on land all over southwestern Europe at the end of the Jurassic (Kimmeridgian sensu anglico - Portlandian). The review of fossil wood data indicates that such a stressful environment may have constrained terrestrial biocoenoses and their evolution at the Jurassic/Cretaceous boundary. But wood generic diversity curves are also strikingly similar to that drawn 20 years ago for nonmarine tetrapods, implying a fossil Lagerstatte effect.
Marc Philippe - One of the best experts on this subject based on the ideXlab platform.
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New occurrences of the wood Protocupressinoxylon purbeckensis francis : implications for terrestrial biomes in southwestern Europe at the jurassic/cretaceous boundary
Palaeontology, 2010Co-Authors: Marc Philippe, Jean-paul Billon-bruyat, José C. García-ramos, Loïc Bocat, Bernard Gomez, Laura PiñuelaAbstract:Previously known from the Kimmeridgian-Portlandian of Dorset (UK) only, Protocupressinoxylon purbeckensis wood is reported here from the Kimmeridgian of Asturias (Spain) and Ajoie (Switzerland). The morphospecies taxonomy and nomenclature are discussed, and new supplementary illustrations are given. The P. purbeckensis tree was growing in dry strongly seasonal (tropophilous) environments, and the new occurrences suggest that such a climate prevailed on land all over southwestern Europe at the end of the Jurassic (Kimmeridgian sensu anglico - Portlandian). The review of fossil wood data indicates that such a stressful environment may have constrained terrestrial biocoenoses and their evolution at the Jurassic/Cretaceous boundary. But wood generic diversity curves are also strikingly similar to that drawn 20 years ago for nonmarine tetrapods, implying a fossil Lagerstatte effect.
D N Kiselev - One of the best experts on this subject based on the ideXlab platform.
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ammonites and stratigraphy of the terminal part of the middle volgian substage upper jurassic epivirgatites nikitini zone and its equivalents of the panboreal realm 2 titanites and glaucolithites
Stratigraphy and Geological Correlation, 2018Co-Authors: D N Kiselev, M A RogovAbstract:The genera Titanites and Glaucolithites, which were previously known only from the Portlandian of Northwestern Europe are now established in Epivirgatites nikitini Zone of European Russia. The Volgian species of Titanites are represented by both the endemic taxa Titanites (Paratitanites) manipulocostatus subgen. et sp. nov. and T. (Pseudogalbanites) triceps subgen. et sp. nov. and Titanites (Titanites) ex gr. titan Buckman of the Portland type. A new species Glaucolithites gardarikensis is described. It is likely that these ammonites migrated to the Central Russian Sea from northwestern Europe via the Norway-Greenland seaway and further to the Mezen-Pechora system of straits, which is supported by occurrences of Titanites in the north of Central Russia and Glaucolithites in East Greenland and on Spitsbergen. The direct and indirect correlations show that the middle part of the Nikitini Zone (Lahuseni Subzone) should at least partly be correlated with the Portlandian Kerbeus Zone.
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Ammonites and stratigraphy of the terminal part of the Middle Volgian Substage (Upper Jurassic; Epivirgatites nikitini zone and its equivalents) of the Panboreal Realm: 1. Late morphogenesis and systematics of Dorsoplanitinae
Stratigraphy and Geological Correlation, 2017Co-Authors: D N KiselevAbstract:Problems of correlation of the upper part of the middle Volgian beds of European Russia and Arctic regions with the Portlandian of England and northern France largely result from existing uncertainties in the taxonomy of the ammonite subfamily Dorsoplanitinae. The poor knowledge of the morphogenesis of this group precludes effective and stable taxonomy and recognition of parallelisms, thereby decreasing the group’s correlative-biostratigraphic potential. In Dorsoplanitinae, dimorphism is revealed in the differences in the terminal shell diameter and, to a lesser extent, in the sculpture, whereas apertural modifications characteristic of many Perisphinctoidea are not observed in members of this group. The middle Volgian Dorsoplanitinae are represented by minimorphs and macromorphs, taxonomically different at the species or genus level. The Volgian minimorphs are mainly represented by the genera Epivirgatites and Lomonossovella , whereas macromorphs are represented by Titanites s.l.; in the genus Taimyrosphinctes , micro- and macromorphs belong to different subgenera. All morphological types of Volgian Dorsoplanitinae have vicariate equivalents in the Portlandian, which can be used for the interregional correlations.
Bernard Gomez - One of the best experts on this subject based on the ideXlab platform.
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New occurrences of the wood Protocupressinoxylon purbeckensis francis : implications for terrestrial biomes in southwestern Europe at the jurassic/cretaceous boundary
Palaeontology, 2010Co-Authors: Marc Philippe, Jean-paul Billon-bruyat, José C. García-ramos, Loïc Bocat, Bernard Gomez, Laura PiñuelaAbstract:Previously known from the Kimmeridgian-Portlandian of Dorset (UK) only, Protocupressinoxylon purbeckensis wood is reported here from the Kimmeridgian of Asturias (Spain) and Ajoie (Switzerland). The morphospecies taxonomy and nomenclature are discussed, and new supplementary illustrations are given. The P. purbeckensis tree was growing in dry strongly seasonal (tropophilous) environments, and the new occurrences suggest that such a climate prevailed on land all over southwestern Europe at the end of the Jurassic (Kimmeridgian sensu anglico - Portlandian). The review of fossil wood data indicates that such a stressful environment may have constrained terrestrial biocoenoses and their evolution at the Jurassic/Cretaceous boundary. But wood generic diversity curves are also strikingly similar to that drawn 20 years ago for nonmarine tetrapods, implying a fossil Lagerstatte effect.
Loïc Bocat - One of the best experts on this subject based on the ideXlab platform.
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New occurrences of the wood Protocupressinoxylon purbeckensis francis : implications for terrestrial biomes in southwestern Europe at the jurassic/cretaceous boundary
Palaeontology, 2010Co-Authors: Marc Philippe, Jean-paul Billon-bruyat, José C. García-ramos, Loïc Bocat, Bernard Gomez, Laura PiñuelaAbstract:Previously known from the Kimmeridgian-Portlandian of Dorset (UK) only, Protocupressinoxylon purbeckensis wood is reported here from the Kimmeridgian of Asturias (Spain) and Ajoie (Switzerland). The morphospecies taxonomy and nomenclature are discussed, and new supplementary illustrations are given. The P. purbeckensis tree was growing in dry strongly seasonal (tropophilous) environments, and the new occurrences suggest that such a climate prevailed on land all over southwestern Europe at the end of the Jurassic (Kimmeridgian sensu anglico - Portlandian). The review of fossil wood data indicates that such a stressful environment may have constrained terrestrial biocoenoses and their evolution at the Jurassic/Cretaceous boundary. But wood generic diversity curves are also strikingly similar to that drawn 20 years ago for nonmarine tetrapods, implying a fossil Lagerstatte effect.