昌乐蓝宝石闻名遐尔，但蕴藏蓝宝石的火山岩及火山群却少有人知。 昌乐县境内几十个由新近纪临朐群牛山组尧山组玄武岩构成的山包，大都是古火山口（颈）。
Many mountains in Changle county which were composed of basalts in Niushan and Yaoshan formation of Linqu group in New Neogene period are mainly Neo-volcanic craters.
昌乐蓝宝石闻名遐尔，但蕴藏蓝宝石的火山岩及火山群却少有人知。 昌乐县境内几十个由新近纪临朐群牛山组尧山组玄武岩构成的山包，大都是古火山口（颈）。
Many mountains in Changle county which were composed of basalts in Niushan and Yaoshan formation of Linqu group in New Neogene period are mainly Neo-volcanic craters.
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