[ Top ] [ Japanese ]

Older period

Classification by Older period and Younger period was modified recently but strata described based on old definitions when new definition has not been described.

The volcanic activity at northern Yatsugatake area is separated as Yabashira volcanoes.

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown