本文讨论范围主要包括湖州、苏州以东,杭州、绍兴以北,杭州湾北岸的广大平原地区。为了对本区的地层分区边界有一较完整的概念,也涉及到丹阳、宣城一线以东的江苏、安徽部分地区。本区一般只有极少量中生代火山岩的小山,和过去常被误认为上古生界的另星残丘外,均为第四系所掩覆。 This paper discusses the scope of the main areas including Huzhou, east of Suzhou, Hangzhou, north of Shaoxing, Hangzhou Bay north of the vast plains. In order to have a more complete concept of the boundaries of stratigraphic subdivision in this area, it also involves parts of Jiangsu and Anhui provinces to the east of Danyang and Xuancheng. This area is generally only a very small amount of Mesozoic volcanic hills, and in the past was often mistaken for another Paleozoic remnant of the Paleozoic, are covered in the Quaternary.