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Collection / 48 th Annual Meeting of Palaeontological Association

Nombre total de vidéos : 42

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18/12/2004 00:00 | Durée : 00:10:40
Intervenants : John Marshall
The appearance of seed plants in the Late Devonian is a critical episode in earth history. How seeds evolved is still an open question. Recently, in Palaeontology, Marshall and Hemsley described Spermasporites allenii from a Middle Devonian lake on ...
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18/12/2004 00:00 | Durée : 00:14:48
Intervenants : Ian Troth
During the Mid Palaeozoic Bolivia was part of the Malvinokaffric Province, a high-latitude southern hemisphere realm that had a highly endemic marine fauna. This makes dating and correlation with Euramerica by macrofossils difficult, but microfossil...
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18/12/2004 00:00 | Durée : 00:14:09
Intervenants : O. Erik Tetlie
The monophyletic Palaeozoic chelicerate order Eurypterida, contains around 65 genera and is the subject of the first large-scale phylogenetic analysis of the group (201 morphological characters for the entire Chelicerata). Many eurypterids are known...
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18/12/2004 00:00 | Durée : 00:13:09
Intervenants : Melise Harland
During the Cretaceous the polar regions were covered with dark dense forests. These forests would have significantly modified the climate both on polar and global scales, due to their low albedo and their effect on the land-surface heat budget and t...
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18/12/2004 00:00 | Durée : 00:15:31
Intervenants : Colin Barras
One of the most rapid and most important morphological diversifications of echinoids occurred during the late Early and Middle Jurassic. It was during this period that the major lines of irregular echinoid became established, leading on the one hand...
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18/12/2004 00:00 | Durée : 00:12:00
Intervenants : David Casenove
The Permian–Triassic interval witnessed the most severe mass extinction of the Phanerozoic. Despite its significance for the evolution of the marine biosphere, the subsequent recovery has attracted relatively little research effort. Recent work has ...
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18/12/2004 00:00 | Durée : 00:15:28
Intervenants : Chris Nicholas
Animals fractionate nitrogen and organic carbon isotopes during food digestion and preferentially excrete the lighter isotopes. New body tissues subsequently grown become about +3.4‰ more positive in d15N than their food and about +1‰ more enriched ...
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18/12/2004 00:00 | Durée : 00:16:48
Intervenants : James R. Wheeley
Articulated Asaphus (A.) raniceps body fossils are preserved within Thalassinoides branching burrow networks across an extensively exposed bedding surface of the Llanvirn Orthoceras Limestone in Jämtland, Sweden. Facultative tunnelling behaviour is ...
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18/12/2004 00:00 | Durée : 00:14:52
Intervenants : Graham A. Young
A unique and spectacular Early Palaeozoic tropical archipelago is being unearthed near Churchill, Manitoba, Canada. Islands composed of Proterozoic quartzite are surrounded by shallow marine deposits of Late Ordovician and Early Silurian age. Field ...
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18/12/2004 00:00 | Durée : 00:12:18
Intervenants : C. M. Belcher
Models of the Cretaceous–Tertiary impact at Chicxulub have suggested that the thermal radiation released by the impact would have been sufficient to ignite extensive wildfires. Eight non-marine K–T sequences stretching across North America have been...
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18/12/2004 00:00 | Durée : 00:14:09
Intervenants : Andreas Braun
Clay-rich and siliceous sedimentary rocks of lowermost Cambrian age on the Yangtze Platform, China contain a large amount of siliceous microfossils. Based on their high content of siliceous hard parts, these rocks are in fact biosiliceous sediments....
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18/12/2004 00:00 | Durée : 00:10:54
Intervenants : Edouard Poty
On the Namur-Dinant Basin platform (Belgium, north France), the top of the highstand system tract of the third-order sequence 4 corresponds to the Avins Member, a little lower than the Tournaisian-Visean boundary, which is situated in the lower part...
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18/12/2004 00:00 | Durée : 00:13:08
Intervenants : Eric Buffetaut
In 1874, Charles Barrois reported a pterodactyl tibia, from the White Chalk (“Craie blanche”) which was then exploited in underground quarries at Lezennes (now in the suburbs of Lille). He referred it to Pterodactylus giganteus, a species from the E...
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18/12/2004 00:00 | Durée : 00:14:15
Intervenants : B.H. Lomax
Changes in atmospheric oxygen, major volcanic eruptions and impact events have the potential to induce short- and long-term changes to the stratospheric ozone layer. However, detecting the interaction between these events and the expected increase i...
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18/12/2004 00:00 | Durée : 00:54:10
Intervenants : Stephan Bengtson
Annual adress de Stephan Bengtson, Emeritus Editor Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
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18/12/2004 00:00 | Durée : 00:15:28
Intervenants : John Alroy
The Paleobiology Database is a public resource for the scientific community. It has been organized and operated by a multi-disciplinary, multi-institutional, international group of paleobiological researchers. Its purpose is to provide global, co...
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18/12/2004 00:00 | Durée : 00:12:59
Intervenants : Benjamin J. Fletcher
Glaciation in the late Ordovician caused the second largest mass extinction in the Phanerozoic, with 26% of families made extinct. It is thought that atmospheric CO2, a major control of climate, was very high during the Ordovician. There are current...
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18/12/2004 00:00 | Durée : 00:14:40
Intervenants : Björn Berning
Contrasting Late Miocene bryozoan faunas from the eastern Atlantic and western Mediterranean : implications for palaeoenvironmental reconstruction and the species concept in Bryozoa. A comparative morphological study on bryozoan faunas from the Lat...
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18/12/2004 00:00 | Durée : 00:15:34
Intervenants : Blair A. Steel
Cryptic species (genetically isolated and ecologically disparate sibling taxa) are seemingly common in the marine plankton, and both molecular clock and palaeontological methods suggest that some, if not many, of these diverged many millions of year...
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18/12/2004 00:00 | Durée : 00:09:55
Intervenants : Loïc Costeur
Mid-Miocene latitudinal environmental gradient in western Europe : mammals and vegetation compared The middle Miocene (16 to 11 My) is a key period in the Cenozoic climatic evolution. It represents the last warmest episode of the Tertiary (Miocene ...
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