GEO

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3mo
Interview: Former Musician Captures the Silent Serenity of Iceland’s Majestic Mountains
basalt columns
Basalt Columns of the Isle of Staffa, Scotland. The ‘Staffa Group’ is the name given to the series of olivine tholeiite basalts found in the vicinity of Mull which erupted 55–58 million years ago.The lava contracted towards each of a series of equally spaced centres as it cooled and solidified into prismatic columns, a process known as columnar jointing. The columns typically have three to eight sides, six being most common. The columns are also divided horizontally by cross joints.