The Cenozoic formations developed in the "Yuya-wan area", Yamaguchi Prefecture are subdivided as shown in the following table.
In this article the writers gave the description of the Tertiary stratigraphy and structure in the area, and tried to make the correlation among the Tertiary formations in this area, the North Kyushu, and the San-in district with one another.
[Original table is skipped. For more details, please refer to the full text.]