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Evolution of the last Tropidocoryphinae (Trilobita) during the Frasnian
2005Early Upper Devonian Tropidocoryphinae (Proetida, Trilobita) show unequivocal evidence of eye-reduction leading to blindness and extinction slightly before or during the Kellwasser Event. The obviously gradualistic evolution can be related to environmental change.
Raimund Feist, Euan N. K. Clarkson
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The semichatovae Transgression (basal upper Frasnian) in Morocco
The semichatovae Transgression marks an episode of major eustatic sea level rise in the Upper Devonian. It is commonly described by the wide spread of the index conodont Palmatolepis semichatovae and has been proposed to define the boundary between the middle and upper Frasnian substages within Frasnian conodont zone 11. The index species is known fromGroßklaus, Maximilian* +1 more
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Preliminary analysis of frasnian, late devonian conodont biogeography
Historical Biology, 1995Although conodont endemism was not as high in the Frasnian as in earlier Devonian intervals, analysis of a limited number of intensively collected sections in the Montagne Noire, the United States and Canada, Western Australia, and the Russian Platform demonstrates levels of endemism ranging from about 30 to 35% in three composites of two zones each ...
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The late Frasnian (Upper Devonian) Kellwasser Crisis
2005Detailed investigations of sequences containing the Kellwasser Bio-event near the Frasnian-Famennian boundary demonstrate a stepwise character of influences on different groups of organisms over a time span of more than 1 my. Therefore the term Kellwasser Crisis (KW Crisis) is introduced. Extraordinary episodes of the KW Crisis, like e.g.
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Late Devonian benthic ostracods from South China and their response to the Frasnian–Famennian event
Geological Journal, 2021Junjun Song, Sylvie Crasquin, Wen Guo
exaly