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在长江三角洲多年考古发掘中发现 ,在文化层之间经常出现由自然淤积的泥炭和沼铁构成的不含任何文化器物的文化间歇层。这些文化间歇层主要分布于 3个时间段 :( 1)崧泽文化晚期—良渚文化早期 ( 530 0～ 4 70 0yrBP) ;( 2 )良渚文化晚期—马桥文化早期 ( 4 2 0 0～ 4 0 0 0yrBP) ;( 3)马桥文化晚期—商周文化早期 ( 330 0～ 30 0 0yrBP)。此外 ,在本区第四纪地质调查和市政工程建设中还发现大量全新世埋藏古树和泥炭沉积。这些埋藏古树和泥炭层主要出现在 4个时间段地层中 :( 1)大西洋气候期早期 ( 70 0 0～60 0 0yrBP) ;( 2 )大西洋气候期晚期 ( 550 0～ 50 0 0yrBP) ;( 3)亚北方气候期中期 ( 4 40 0～ 4 10 0yrBP)以及 ( 4 )亚北方气候期晚期 ( 360 0～ 310 0yrBP)。上述现象反映了本区全新世气候和海面中低频的波动特征。大量研究揭示 ,上述灾变沉积地层主要起因于高温高海面条件下夏季风活动增强引发的 4次大规模陆地洪水事件 ,但并非由海侵所致。
Many years of archaeological excavations in the Yangtze River Delta found that culturally intermittent layers of cultural artifacts, consisting of naturally deposited peat and ferrochromium, often appear among the cultural strata. These cultural intervals are mainly distributed in three time periods: (1) Early Songzhu Culture - Early Liangzhu Culture (530 0-470 0yr BP); (2) Late Liangzhu Culture - Early Maqiao Culture (4 20 0 0) ~ 400yrBP); (3) Late Maqiao culture - early commercial culture (330 ~ 3000yrBP). In addition, a large number of buried Holocene ancient trees and peat deposits have also been found in Quaternary geological survey and municipal engineering construction in this area. These buried ancient trees and peat layers mainly occur in four time intervals: (1) the early Atlantic climate (7060-60yrBP); (2) the late Atlantic climate (550-5000yrBP); (3) the middle sub-northern climate period (4 40 0 ~ 4 10 0rr BP) and (4) the sub-northern climate period (360 0 ~ 310 0yrBP). The above phenomena reflect the fluctuation characteristics of Holocene climate and sea surface low frequency in this area. Numerous studies have revealed that the above-mentioned catastrophic sedimentary formations are mainly caused by four large-scale land-flood events triggered by the enhanced summer monsoon activity under high temperature and high sea conditions, but not caused by transgression.