There are Holocene beachrocks exposed on the sandy beach of the midintertidal zone in thirteen coves between rock headlands along the coast in Zhejiang Province Except for Lianyungang beachrock,Zhejiang beachrocks are the northernmost ones found in China, located in the middle subtropicThe age from data of 14C is from 2 705 a±160 a BP to 6 485 a±210 a BP. Its basic features and palaeogeographic significance were discussed Results of the study indicate that the grains(shells and their fragments of in
tertidalneritic bivalves,gastropods,foraminiferas and ostracods, and clasts of granite,etc.) which are produced by marine processes,grainsupported texture and aragonite as the cement are the most important features of the beachrocksFavourable geomorphologic landscape, such as in a cove with sandy beach,sufficient supplies of grains including terrigenous detritus,quartz,feldspar,and a large amount of bioclasts,moderate grain size and hydrodynamic conditions ,stable sea level and high temperature influence the formation of the beachrocksDuring formation of the beachrocks,the coastline of the middlenorthern part of Zhejiang Province was basically stable,and Donghai Sea longshore current was not the low temperature current like the presentIts temperature was about 5～６℃(at least 2℃)higher than the present,whereas it was the low salinity current like the present. Zhejiang Province belonged to the tropical climate zone,or climatic zonation was not distinct at that time