This island is made of volcaniclastic rock that formed into a dike when the magma penetrated the Muro strata of accretionary prism. You can see how the magma had flowed through the cracks in the stratum and also other pebbles and rocks that got caught in the magma.
- Postal Code
- Mirozu, Susami Town, Nishimuro-gun, Wakayama
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