The Disappearance of the Coscinodiscus Yabei Zone in the Subarctic Hokkaido Region
Koizumi, Itaru
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http://hdl.handle.net/2115/36767
Abstract
The overlapped ranges of Denticulopsis praedimorpha and Denticulopsis dimorpha, which belong to the same evolutionary lineage, were firstly recognized in the subarctic section of Hokkaido. The stratigraphic distribution of some diatom species around the boundary between the middle and late Miocene reveals diachronous distribution across the subarctic front by the effect of a "climatic wedge."
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