下部层序形成于盆地裂陷早期，以粗碎屑快速堆积为主。
The lower sequence, formed in the early chasmic stage of the basin, mainly consists of rapidly accumulated coarse sediments.
主要论述了这次大爆发的火山喷发碎屑堆积物的层序和分布。
The author deals with mainly the sequence and distribution of the pyroclastic deposits of the 800 a. B. P. eruptions.
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