Oda Pyroclastic Flow Deposits

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Oda Pyroclastic Flow Deposits Hattori et al., 1983

Type locality: Oda - Lake Ukinunoike, Sanbe town, Oda city, Shimane prefecture
Tephra
Pleistocene (ca. 15 ka; 16,000, 14,780 yBP, ¹⁴C)
Intruded by: Sandstone dikes

Lithofacies: Non-welded tuff (Some flow units)
Lithofacies: Hornblende biotite dacite pumice, Lithic fragments
Sedimentary structures: Parallel stratification

Source: southwestern part of Sanbe caldera
Thickness: ca. 4 - 20 m
Upper limit: Unconformity (Sanbe Pumice Fall Deposits)
Lower limit: Conformity (Oda Base Surge Deposits), Unconformity (Uyama Base Surge Deposits)

2nd stage
[ Upper ]
~~~~~~~~~~~~~~
Oda Pyroclastic Flow Deposits
--------------
Oda Base Surge Deposits
~~~~~~~~~~~~~~
Hikageyama Lava
~~~~~~~~~~~~~~
Uyama Base Surge Deposits
~~~~~~~~~~~~~~
[ Lower ]

Sanbe volcano
[ Upper ]
~~~~~~~~~~~~~~
4th stage
~~~~~~~~~~~~~~
3rd stage
~~~~~~~~~~~~~~
2nd stage
~~~~~~~~~~~~~~
1st stage
~~~~~~~~~~~~~~
Older Sanbe stage
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Oda - Lake Ukinunoike - Ikeda - Meotomatsu, Sanbe town, Oda city, Shimane pref.; Masugatoge pass, Oda city, Shimane pref.; Yugakai, Misato city, Ochi county, Shimane pref.

Hattori et al. (1983) Geology of the Sambesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 168p. (in Japanese with English abstract 7p.)