求翻译：第四纪时期火山活动非常活跃，自始至终都以玄武质岩浆喷发为特征，形成了数以百计的火山口、火山锥，许多火山口成为典型的玛珥和玛珥湖，并在这些火山口和火山锥的周围广泛分布着熔岩流和碎屑流，形成熔岩席、熔岩台地、火山渣堆和火山碎屑流，具有典型的基浪堆积（图2），是什么意思？

Very active in the Quaternary period, volcanic activity, from beginning to end to the eruption of basaltic magma characteristics, forming a crater hundreds of volcanic cones, many crater typical Maar Maar lake, and in crater widely distributed around the volcanic cone with lava flows and debris flow

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Quaternary period volcano activities very active, throughout are to Xuanwu mass magma eruption for features, formed has hundreds of crater, and volcano Cone, many crater became typical of Mary Joel and Mary Joel Lake, and in these crater and volcano cone of around broad distribution with lava stream

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