We present the ichnological characterization on marine gastropod shells from Late Pleistocene, mid-Holocene and modern beaches at 5 sampling sectors along the southern Golfo San Jorge, a key area at central Patagonia in terms of geological, physical and biological features of the southern Southwestern Atlantic margin. Based on bioerosion recovered in 579 gastropod shells (22% showing bioerosion and 78% free of traces), a total of 12 ichnogenera were recorded: Caedichnus, Caulostrepsis, Entobia, Finichnus, Iramena, Maeandropolydora, Oichnus, Pennatichnus, Pinaceocladichnus, Podichnus, Renichnus and Stellichnus. Of these, Iramena (57%), Oichnus (12%) and Maeandropolydora (9%) are the most abundant representing near 80% of the traces recorded, while Stellichnus is the first record for the marine Quaternary of Argentina. A comparison of bioerosional patterns along the area through time (Late Pleistocene, mid-Holocene and modern) allows reinforcing our previous ichnological evidence and hypotheses for Patagonia and other areas of Argentina. Overall, they tell us about changes to the present, pointing to a Last Interglacial colder water and higher productivity within a different circulation scenario compared to the mid-Holocene amelioration and present day conditions.

我们根据南大西洋南部的地质，物理和生物学特征，对沿南部戈尔福圣豪尔赫河（位于巴塔哥尼亚中部的一个关键区域）的五个采样区的晚更新世，全新世中期和现代海滩的海洋腹足动物的壳进行了物候学表征保证金。根据在579个腹足纲动物壳中恢复的生物侵蚀（22％表现出生物侵蚀而78％没有痕迹），总共记录了12个鱼鳞ogen科：Caedichnus，Caulostrepsis，Entobia，Finichnus，Iramena，Maeandropolydora，Oichnus，Pennatichnus，Pinaceocladichnus，Podichnhnus和Stellichnus。其中，Iramena（57％），Oichnus（12％）和Maeandropolydora（9％）含量最高，占记录的痕迹的近80％，而Stellichnus是阿根廷海洋第四纪的第一笔记录。通过比较整个地区（晚更新世，全新世中期和现代）沿线的生物侵蚀模式，可以加强我们先前对巴塔哥尼亚和阿根廷其他地区的鱼类学证据和假设。总体而言，他们向我们介绍了当前的变化，并指出与全新世中期的改善和当今的状况相比，末次冰川间期的冷水和不同循环情景下的生产率更高。