在第三纪的喜山期岩浆活动较强烈，因此，坳陷内第三纪火成岩分布广泛。
The Tertiary igneous rocks broadly distribute in this depression, since of magmatic activity was very frequent during the Xishan Epoch.
火成岩活动主要集中在晚第三纪和第四纪。
The activity of igneous rocks mainly concentrates in Neogene and Quaternary.
火成岩活动主要集中在晚第三纪和第四纪。
The activity of igneous rocks mainly concentrates in Neogene and Quaternary.
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