Giant's Causeway: Top Photos

Forty thousand hexagonal columns left by an ancient eruption

Trachybasalt in the Pleistocene of California, USA. Famous localities for seeing excellent columnar jointing include Giants Causeway (Ireland), Devils Tower (Wyoming, USA), and Devils Postpile (Califo
Trachybasalt in the Pleistocene of California, USA. Famous localities for seeing excellent columnar jointing include Giants Causeway (Ireland), Devils Tower (Wyoming, USA), and Devils Postpile… © James St. John, CC BY 2.0, via Wikimedia Commons

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