Eocene lavas belong to high K Calc alkaline (HK CA) series and those of Miocene to shoshonite (SHO) series.
渐新世火山岩为高钾钙碱性系列，中新世岩石属于钾玄岩系。
Oligocene a geological epoch in the Tertiary, between Eocene and Miocene, lasting from about 38 to 25 million years ago.
渐新世纪第三纪始新世与中新世之间的地质纪元，大约从三千八百万年持续到二千五百万年前的一段时间。
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