Titlebook: Global Events and Event Stratigraphy in the Phanerozoic; Results of the Inter Otto H. Walliser Book 1996 Springer-Verlag Berlin Heidelberg

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Geobiological Trends and Events in the Precambrian Biosphereryotes has to be supplemented by the interpretation of some sedimentological, geochemical and paleoclimatic phenomena as the biologically controlled processes. Biochemical and ecological conservatism of the prokaryotic ecosystems makes it possible to decode their signals documented in the Precambria

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Silurian Bio-Eventsnot a quiet period either. There were established 15 more or less remarkable bio-events, among others the most severe extinction of conodonts and acritarchs in the very beginning of the Wenlock (Ireviken Event), the Great Crisis or . Event among graptolites in the Homerian and the middle Ludfordian

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