In paleoenvironmental research, several proxies are used to reconstruct climate and vegetation. The establishment of a chronological framework allows for the association of different proxies and correlation of events happening in different geographic areas. Cultural deposits, such as the shellmounds found along the coast of Brazil, play an important role in paleoenvironmental interpretations. Here, we have employed anthracological analysis in charcoal fragments from the Amourins shellmound, located at the margins of the Guanabara Bay, Rio de Janeiro. This allowed for the taxonomic identification and selection of short-lived trees and specific parts of plants for accurate radiocarbon dating. We recorded genera and families typical of the Atlantic Forest, restinga forest, open restinga and mangrove. The 14C ages of charred nuts from different occupational layers range from 3807 ± 35 to 3503 ± 70 BP and a sequential chronological model was built, relating the predominance of mangrove vegetation to the period between 4130–3960 cal BP.

中文翻译：

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AMOURINS SHELLMOUND：通过木炭分析发现生物多样性和年代学

在古环境研究中，一些代理被用来重建气候和植被。时间框架的建立允许关联不同的代理和在不同地理区域发生的事件的相关性。文化沉积物，例如在巴西海岸发现的贝丘，在古环境解释中发挥着重要作用。在这里，我们对位于里约热内卢瓜纳巴拉湾边缘的 Amourins 贝丘的木炭碎片进行了炭疽学分析。这允许对短寿命树木和植物的特定部分进行分类识别和选择，以进行准确的放射性碳测年。我们记录了大西洋森林典型的属和科，休息森林，开放休息和红树林。这14不同职业层的烧焦坚果的 C 年龄范围为 3807 ± 35 至 3503 ± 70 BP，并建立了一个时序模型，将红树林植被的优势与 4130 至 3960 cal BP 之间的时期联系起来。