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Columnar Joint at Mio Oshima

It is believed that the columnar joint rhyolite formation was created by volcanic activity 2-3Ma. Due to bad weather condition, I couldn't approach to the Mio Oshima(island) but could walk the opposite shore which also has similar columnar joint, shown picture below. (2018.May)



Mio, Sinonsen, Mikata, Hyogo

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