The relative sea-level variation curve, obtained by dating and leveling vermetid shells from northern Santa Catarina State (26.3°S), presents fall trend during all the last 4.0 cal ka BP, which matches previous results based on the same kind of indicator for the Brazilian coast between 3°S and 28°S. Chemical and isotopic analyses of 50 vermetid bioconstructions from distinct localities of south-southeastern Brazilian coast indicate possible changes in the coastal water temperature. These changes may have been caused by oscillations in the strength of Brazilian Coastal Current, which carries La Plata Plume northward, being therefore responsible for the penetration of cold and less saline water masses in the study area. This is a reasonable explanation for the scarcity of vermetid biolithites around 3.4–2.6 cal ka BP and 0.5–0 cal ka BP.

通过对北部圣卡塔琳娜州（26.3°S）的蠕虫壳进行测年和测平获得的相对海平面变化曲线呈现出最近4.0 cal ka BP的下降趋势，该曲线与基于相同指标的先前结果相符。巴西海岸介于3°S和28°S之间。对巴西东南南部沿海不同地区的50种生物生物构造进行的化学和同位素分析表明，沿海水温可能发生变化。这些变化可能是由巴西沿海海流强度的波动引起的，该流向北拉普拉塔羽，因此导致了研究区域内冷水和少量盐水的渗透。这是对在3.4–2.6 cal ka BP和0.5–0 cal ka BP附近稀有生物岩体稀缺性的合理解释。