Turbulent history In fact, basalt formations are not that unusual around the world. Well-known sites include the Columbia River Plateau that encompasses three of the larger states in the US, the Deccan Plateau in northwest India (which dates back to the Cretaceous period), and the Emei Mountain basalt rock in China.
滄海桑田就地球史上的火山活動而言，玄武岩在全世界並非那樣稀罕，世界知名的玄武岩地點就有橫跨美國三大州的「哥倫比亞河高原」、印度西北部屬於白堊紀的「德干高原」，以及中國大陸的峨嵋山玄武岩。