We studied the remains of the pottery tempered with sand and shell,burnt clay blocks,briquetages and calcareous concretion excavated from the Daxie site in Ningbo,carrying out compositional and phase analyses of them to obtain basic material information.Carbon and oxygen isotope studies were carried out on some of the calcium carbonate in the relics to understand their formation,to help find out the cause of formation of the remains and the events through which they were formed,and supplemented with strontium isotopes to determine the marine or terrestrial origin of some samples.Based on the results of our study,we found that some calcareous concretions,which were non-marine but closely associated with seawater,were produced at a temperature of around 38℃.Perhaps the calcium in the soil mixed with those precipitated from the salt mud or brine during the drying process,eventually forming such remains.In addition,the weathering of the inner wall of the pots and the carbon and oxygen isotopes of the tempered shell material within them also suggest that they might be used to boil water.In addition,some of the burnt clay pieces were observed to be heavily weathered and powdered outside,they may have been put into brine to heat it.In summary,the remains from the Daxie site were closely associated with salt production,and the local salt industry might use the method of both solar evaporation and manual heating.
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