摘要
The region of our research lies between the Longchuan (龙川) River and the Binlang (槟榔) River. Here Cenozoic volcano rocks are widely developed. They are mostly basalts, though petrographically different. According to the sequence of volcanic eruptions and the fossils in sedimentary strata, it is suggested that these volcanic eruptions took place in the Late Tertiary and the Quaternary. The Quaternary eruptions may be further divided into 4 subperiods,
