Dainenzan and Hikoemonzawa Pumice and Pyroclastic Flow Deposit

Dainenzan and Hikoemonzawa Pumice and Pyroclastic Flow Deposit (Igarashi et al., 1983)

Invalid synonym: Dainenzan Pyroclastic Flow Deposit, Hikoemon Pumice Bed

Type locality: Hikoemon creek, Kijimadaira city, Shimotakai county, Nagano prefecture
Tephra
Pleistocene

Lithofacies: Calc-alkaline
Lithofacies (Upper): Dacite pyroclastic flow deposit
Lithofacies (Lower): Dacite pumice fall deposit
Sedimentary structures (Upper): Parallel stratification

Thickness: 15 m or thicker
Lower limit: Unconformity (Okushiga Lake Deposit, Hakkenzan Lava)

Stage 3
[ Upper ]
+__+__+__+__+_
Sarasarazawa Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
Dainenzan and Hikoemonzawa Pumice and Pyroclastic Flow Deposit
~~~~~~~~~~~~~~
[ Lower ]

Torikabuto volcano
[ Upper ]
+__+__+__+__+_
Stage 3
~~~~~~~~~~~~~~
Stage 2
~~~~~~~~~~~~~~
Stage 1
~~~~~~~~~~~~~~
Maekura Stage
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Hikoemon creek - Mount Daikura, Kijimadaira city, Shimotakai county, Nagano pref.

Igarashi et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.11, pp.565-584 DOI
Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)