Issaikyo Unit

Abbr.: Az-IS

Tephra
Holocene (4,340 yBP, ¹⁴C)

Sedimentary facies: Pyroclastic fall deposit
Lithofacies: Olivine-bearing orthopyroxene clinopyroxene andesite
Lithofacies: Volcanic blocks, Lapilli

Source: Issaikyo crater
Mode of eruption: Vulcanian
Thickness: 3 m or thicker

Jododaira volcano
[ Upper ]
~~~~~~~~~~~~~~
Jododaira JP7 Unit
~~~~~~~~~~~~~~
Oana Unit
~~~~~~~~~~~~~~
Jododaira JP6 Unit
~~~~~~~~~~~~~~
Jododaira JP5 Unit
~~~~~~~~~~~~~~
Jododaira JP4 Unit
~~~~~~~~~~~~~~
Jododaira JP3 Unit
~~~~~~~~~~~~~~
Jododaira JP2 Unit
~~~~~~~~~~~~~~
Issaikyo Unit
~~~~~~~~~~~~~~
Kofuji Unit
~~~~~~~~~~~~~~
Jododaira JP1 Unit
~~~~~~~~~~~~~~
Goshikinuma Unit
~~~~~~~~~~~~~~
Okenuma Unit
~~~~~~~~~~~~~~
[ Lower ]

Azuma volcano
[ Upper ]
~~~~~~~~~~~~~~
Jododaira volcano
~~~~~~~~~~~~~~
Takayama volcano
~~~~~~~~~~~~~~
Higashiazumayama volcano
~~~~~~~~~~~~~~
Eboshiyama volcano
~~~~~~~~~~~~~~
Nakaazumayama volcano
~~~~~~~~~~~~~~
Maedaiten volcano
~~~~~~~~~~~~~~
Issaikyoyama volcano
~~~~~~~~~~~~~~
Tenguiwa volcano
~~~~~~~~~~~~~~
Nishidaiten-Nishiazumayama volcano
~~~~~~~~~~~~~~
Nakadaiten-Higashidaiten volcano
~~~~~~~~~~~~~~
Takakurayama volcano
~~~~~~~~~~~~~~
Shionokawa volcano
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Fukushima pref.

Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)