The Sea Floor by Eugen Seibold & Wolfgang Berger

Author:Eugen Seibold & Wolfgang Berger
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

Today, we prefer the more general term carbonate ooze over “Globigerina ooze” considering that much of the plankton-derived material over most of the seafloor consists not of shells of foraminifers (including the genus Globigerina) but of the remains of minute calcareous algae, the coccolithophores. The skeletal elements of these minute microbes are studied largely with the aid of scanning electron microscopes (SEM), which became available well after Murray and Renard wrote their book. Coccolithophores (Fig. 10.1, right) are plankton organisms that shed the exceedingly small coccoliths, fine-silt fossils that are ubiquitous in calcareous marine deposits (nannofossils). Cenozoic nannofossils, like most fossils, largely consist of extinct forms. They are very useful in biostratigraphy, a fact established largely by the US geologist M.N. Bramlette (1896–1977) and his associates. The nannofossils include abundant Discoasters, last common in the Pliocene, several million years ago.

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