论文部分内容阅读
Recent study revealed that the so-called Neogene Gansu System in the western Loess Plateau contains loess-soil sequences of Miocene age[1]. A most com- plete sequence (QA-I) covers a time interval from ~22 to ~6.2 Ma BP, consisting of more than 230 visual
Recent studies revealed that so-called Neogene Gansu System in the western Loess Plateau contains loess-soil sequences of Miocene age [1]. A most com- plete sequence (QA-I) covers a time interval from ~ 22 to ~ 6.2 Ma BP, consisting of more than 230 visual