On-Fk Tephra

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On-Fk Tephra

Abbr.: On-Fk, Fk-5

Tephra
Pleistocene

Lithofacies: Volcanic ash, Pumice

Source: Mamahahadake volcano group

Mamahahadake volcano group (Younger Ontake Tephra Group
[ Upper ]
~~~~~~~~~~~~~~
On-Fk
~~~~~~~~~~~~~~
On-Pm3
~~~~~~~~~~~~~~
On-Pm3'
~~~~~~~~~~~~~~
On-Pm2'
~~~~~~~~~~~~~~
On-Pm2
~~~~~~~~~~~~~~
On-Pm1
~~~~~~~~~~~~~~
On-Pm1'
~~~~~~~~~~~~~~
[ Lower ]

Younger Ontake Volcanic Rocks
[ Upper ]
~~~~~~~~~~~~~~
Marishiten volcano group
~~~~~~~~~~~~~~
Takigoshi Formation
~~~~~~~~~~~~~~
Mamahahadake volcano group
~~~~~~~~~~~~~~
[ Lower ]

Ontake volcano
[ Upper ]
~~~~~~~~~~~~~~
Younger Ontake Volcanic Rocks
~~~~~~~~~~~~~~
Older Ontake Volcanic Rocks
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Nagano pref.

Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)