New interpretation of the Gran Dolina-TD6 bearing Homo antecessor deposits through sedimentological analysis
New interpretation of the Gran Dolina-TD6 bearing Homo antecessor deposits through sedimentological analysis
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DOI：
10.1038/srep34799
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发表时间：
2016-10-07
影响因子：
4.6
通讯作者：
Arsuaga, J. L.
中科院分区：
文献类型：
--
作者：
Campana, I.;Perez-Gonzalez, A.;Arsuaga, J. L.
Gran Dolina是一个由至少25米的更新世沉积物填充的洞穴。该序列包含TD6地层单位，其记录包括大约170块古人类骨骼，这些骨骼允许定义一个新物种--前人。这种化石堆积被作为一个单一的组合进行研究，并被解释为几个人类家园的连续。我们对TD6进行了完整的地层背景和沉积学解释，分析了沉积相、碎屑与古生物遗迹之间的关系。TD6单元被分为三个亚基和13个层。共划分了9个沉积相。古人类遗骸与泥石流相、河道相和泛滥平原相三种不同的沉积相有关。它们表现为三种类型的分布：一是分散的化石群，二是河流相的层状化石群，三是河流-重力流混合相的化石群。这项工作的结果表明，这些异地相的古地理和沉积特征表明，其中一些原始人类遗骸是通过地质作用积累在洞穴中的，来自洞穴上方的相邻斜坡或洞口。
Gran Dolina is a cavity infilled by at least 25 m of Pleistocene sediments. This sequence contains the TD6 stratigraphic unit, whose records include around 170 hominin bones that have allowed the definition of a new species, Homo antecessor. This fossil accumulation was studied as a single assemblage and interpreted as a succession of several human home bases. We propose a complete stratigraphic context and sedimentological interpretation for TD6, analyzing the relationships between the sedimentary facies, the clasts and archaeo-palaeontological remains. The TD6 unit has been divided into three subunits and 13 layers. Nine sedimentary facies have been defined. Hominin remains appear related to three different sedimentary facies: debris flow facies, channel facies and floodplain facies. They show three kinds of distribution: first a group of scattered fossils, then a group with layers of fossils in fluvial facies, and third a group with a layer of fossils in mixed fluvial and gravity flow facies. The results of this work suggest that some of these hominin remains accumulated in the cave by geological processes, coming from the adjacent slope above the cave or the cave entry, as the palaeogeography and sedimentary characteristics of these allochthonous facies suggest.