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.
在层序地层学中，细粒沉积岩的剖面堆积得很慢，因此只要一个薄层就代表着相当可观的时间跨度。
In sequence stratigraphy, a section of fine-grained sedimentary rocks that accumulated slowly, thereby representing a considerable span of time by only a thin layer.
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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