They contain rich volcanic rocks and minerals by which reliable iso-chronic data can be got, possess successive sandstone and mudstone by which accurate magneto-stratigraphic columns can be set up and distinguish geological events, and also contain a larg
They contain rich volcanic rocks and minerals by which reliable iso-chronic data can be got, possess successive sandstone and mudstone by which accurate magneto-stratigraphic columns can be set up and distinguish geological events, and also contain a larg
与海相地层比较，陆相地层在同位素测年、磁性地层划分和事件地层学研究方面具备建立层型的优势，同样可以找到分布广泛和利于大范围地层对比的化石门类。