Holocene Sedimentary Environments and Sea Level Change Based on Qingfeng Section, Jianhu, Jiangsu, China
XUE Chun-ting (Qingdao Institute of Marine Geology, Qingdao Shandong 266071)
The Holocene strata at Qingfeng section, Jianhu County, Jiangsu Province are 405 cm thick. Most parts of the sediments were thought to be formed in lagoon or bay environments and the bed 6 in coastal low land (4 000～ 2 300 aBP ). A very accurate Holocene sea level change curve with many fluctuations and 2～3 m higher in 6 500～4 000 aBP and 1.5 m lower sea level in 4 000～2 300 aBP than that of the present was drawn by ZHAO Xitao et al. The author put forward different viewpoints on environments and sea levels showed by Qingfeng Section. Bed 1 and the lower part of bed 2 were formed in fresh water marsh environment; the upper part of bed 2 and beds 3, 4 and 5 were formed in intertidal zone. The sediments of bed 6 are products during river flood in estuary. The bed 7 is composed of upper estuary sediments. The sea level since 6 000 aBP should be stable. The very accurate sea level change by foraminiferal thanotocoenose drawn by ZHAO Xitao et al is without the oretical basis and the conclusions on sea level change are unbelievable.