By Ashraf M.T. Elewa
The current e-book combines 3 major points: 5 significant mass extinctions; contributions on another minor extinctions; and extra importantly contributions at the present mass extinction. All 3 elements are brought via fascinating experiences of mass extinctions in diversified organisms starting from small invertebrates to mammals and take account of the main trendy matters discussing mass extinctions in bugs, mammals, fishes, ostracods and molluscs.
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2003; Calner 2005a). In conclusion, apart from the obvious differences in taxonomic loss, the Silurian events are in several aspects comparable to the five monumental crises of the Phanerozoic and definitively more similar to some of them than previously believed. 8 Summary The Silurian global events are a new frontier of Earth science research. Three events are of particular interest because of their impact on the marine environment – the Early Silurian Ireviken Event, the Middle Silurian Mulde Event, and the Late Silurian Lau Event.
Lenz et al. 2006). The time period of extremely low diversity and carbon isotope excursion correlates with increased deposition of organic carbon in the oceans (Porębska et al. 2004; Calner et al. 2006a; Lenz et al. 2006). The precise relationship between extinctions, sea-level change and carbon isotope excursion in carbonate platforms has been demonstrated by Calner et al. (2006a). Fig. 9. The figure shows locations where previous studies have presented firm evidence for anomalies either in stable isotopes, biodiversity, or facies during the Mulde Event.
The oceanic-climatic model of Bickert et al. (1997) In chitinozoan biostratigraphy the start of the event is close to the base of the Margachitina margaritana Zone as defined at the LlandoveryWenlock Global Stratotype Section and Point (GSSP) at the Hughley Brook section, United Kingdom (Mullins and Aldridge 2004). The stratigraphic range of the Ireviken Event has been calculated as corresponding to ca 200,000 years with faunal changes recorded at eleven different datum points (Jeppsson 1997a, 1998; Munnecke et al.
Mass Extinction by Ashraf M.T. Elewa