Rock 365 : Day 175 : Crystal Lithic Vitric Tuff
Day 175 : A crystal lithic vitric tuff, the Lower Rhyolite Tuff from the Snowdonia Volcanic Group at Twll Duu, Ogwen Valley, Snowdonia, Wales.
Day 175 : A crystal lithic vitric tuff, the Lower Rhyolite Tuff from the Snowdonia Volcanic Group at Twll Duu, Ogwen Valley, Snowdonia, Wales.
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