科研之友
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摘要
The traditional Middle Eocene zonation in the Crimean-Caucasus region contains 4 zones. The infrazonal scale contains 7 subdivisions ranked as subzones. The lower boundaries of the zones are defined on first or last appearances of stratigraphically important species. Six stages can be recognized in the evolutionary and ecological progression of the planktonic foraminifers. The similarity and unidirectional morphologic and taxic evolution in the rapidly evolving group of planktonic foraminifera in the Crimean-Caucasus Region and Tethys provide a firm basis for correlation of Lutetian-Bartonian zonations and regional and international (standard) Tethyan stages.
- 出版日期2012
