イタリアにおける最近の海成第四系および海岸段丘の層序・編年研究

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  • An Introductory Review of Recent Chronostratigraphical Studies on Quaternary Marine Sediments and Terraces in Italy.
  • イタリア ニ オケル サイキン ノ カイセイ ダイ4ケイ オヨビ カイガン ダ

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The Marine Quaternary chronostratigraphy established in Italy has been the standard in the Mediterranean area since the end of the 19th century. But the discrepancies in the Quaternary Stages defined by different geologists are often troubling and the original meanings of the terms have sometimes been changed in Italy. This paper briefly reviews recent trends in Italian Quaternary chronostratigraphy, in particular those associated with marine terrace formation.<br>The “Holocene” is exceptionally adopted as a Stage in the Holocene series so as not to cause confusion. In the upper Pleistocene series, the universally known “Tyrrhenian” is identified on the basis of transgressive sediments bearing a molluscan fauna, Strombus bubonius. These sediments, which underlie a well-developed marine terrace, are correlated with the last interglacial epoch, the oxygen isotope substage 5e. Only the “Crotonian” is accepted as occurring in the middle Pleistocene series, which is defined as transgressive biocalcarenite and is correlated to the oxygen isotope stages 7, 9, and 11. The Superstage “Selinuntian”, composed of the three Stages “Santernian, Emilian and Sicilian”, is reliably established in the lower Pleistocene series based on the biochronostratigraphy. The “Santernian” is identified by the appearance of a molluscan fauna Arctica islandica and a species of ostracoda Cytheropteron testudo; the “Emilian” by the benthic foraminifera Hyalinea baltica; and the “Sicilian” by the planktonic foraminifera Grobolotalia truncatulinoides excelsa (Fig. 2).<br>Chronounit “Stages” must be carefully defined and redefined with reference to other Quaternary studies according to the divisional rule of chronostratigraphy, to avoid further problems with terminology.

収録刊行物

  • 第四紀研究

    第四紀研究 34 (2), 107-120, 1995

    日本第四紀学会

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