The Giant's Causeway
Giant's Causeway. Looking SE. Columnar jointing in tholeiitic basalt. The columns are usually from five to seven sided with ball and socket cross-joints.
Old photograph number: NI00708
Giant's Causeway. Looking SE. Columnar tholeiitic basalt, showing ball and socket cross-jointing. The cross-joints are upward and downward facing in apparently random pattern.
Old photograph number: NI00706
Giant's Causeway. Looking N. The Middle Causeway. Columnar tholeiitic lava.
Old photograph number: NI00710
Bob McIntosh
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