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Keywords: S-Basalt.JPG en S-shaped columnar rhyolitic tuff in Hong Kong High Island Reservoir cut by a younger dyke of lamprophyre Source of information about rhyolitic tuff is http //www geopark gov hk/en_s4f7 htm own I took this photo Frequenttraveller 2009-09-27 en wikipedia Basalt Basalt 1 Columnar rhyolites High Island Reservoir Rocks in Hong Kong Tuff Dikes volcanism in China Lamprophyre Outcrops in China Arrested dikes |