Abstract Although the Neuquen Basin (Argentina) has an extensive record of fossil vertebrates for the Upper Cretaceous, little is known about the Early Cretaceous vertebrate faunas. The Mulichinco Formation (early Valanginian), where some dinosaur bone sites were found, provides important additional insights into the composition of continental fauna of that age. Although osteological studies of sauropod and theropod dinosaurs have been published for this unit, no taphonomic studies have been reported to date. Here, we describe the biostratinomic processes that took place on an accumulation of bones found in rocks of the Mulichinco Formation and discuss the relationships between those remains and the environment in which the bones were buried. Taphonomic alteration mechanisms were estimated, including articulation, weathering, abrasion, integrity, bioerosion, transport, and orientation. We described thoroughly a sedimentological section and micro-sections that indicate the stratigraphic location and spatial arrangement of the remains. Three sub-environments in the inferred braided fluvial system were determined and three levels with bones showing different taphonomic attributes were identified within the accumulation. The lag deposits contain indeterminate bone remains with signs of significant transport and probably from different origins. On the other hand, the channel infill contains an articulated carcass of a sauropod and associated remains, of para-autochthonous origin, with no significant transport.

中文翻译：

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阿根廷巴塔哥尼亚穆利钦科组（下瓦兰吉尼阶，内乌肯盆地）的河流沉积物中恐龙遗骸的堆积：埋藏学和古环境推断

摘要 尽管内乌肯盆地（阿根廷）拥有广泛的上白垩世脊椎动物化石记录，但对早白垩世脊椎动物群知之甚少。发现了一些恐龙骨骼遗址的穆里钦科组（Valanginian 早期）为了解那个时代大陆动物群的组成提供了重要的额外见解。尽管已经为此单位发表了蜥脚类恐龙和兽脚亚目恐龙的骨学研究，但迄今为止还没有报告过埋藏学研究。在这里，我们描述了发生在 Mulichinco 组岩石中发现的骨骼堆积上的生物地层过程，并讨论了这些遗骸与埋葬骨骼的环境之间的关系。估计了基因改变机制，包括关节、风化、磨损、完整性、生物侵蚀、运输和定向。我们详尽地描述了沉积学剖面和显微剖面，表明遗迹的地层位置和空间排列。确定了推断的辫状河流系统中的三个亚环境，并在堆积物内确定了三个具有不同埋藏属性的骨骼水平。滞后沉积物含有不确定的骨骼残骸，有明显的运输迹象，可能来自不同的来源。另一方面，通道填充物包含一个蜥脚类动物的铰接式尸体和相关的残骸，属于准本土起源，没有明显的运输。我们详尽地描述了沉积学剖面和显微剖面，表明遗迹的地层位置和空间排列。确定了推断的辫状河流系统中的三个亚环境，并在堆积物内确定了三个具有显示不同埋藏属性的骨骼的水平。滞后沉积物含有不确定的骨骼残骸，有明显的运输迹象，可能来自不同的来源。另一方面，通道填充物包含一个蜥脚类动物的铰接式尸体和相关的残骸，属于准本土起源，没有明显的运输。我们详尽地描述了沉积学剖面和显微剖面，表明遗迹的地层位置和空间排列。确定了推断的辫状河流系统中的三个亚环境，并在堆积物内确定了三个具有不同埋藏属性的骨骼水平。滞后沉积物含有不确定的骨骼残骸，有明显的运输迹象，可能来自不同的来源。另一方面，通道填充物包含一个蜥脚类动物的铰接式尸体和相关的残骸，属于准本土起源，没有明显的运输。滞后沉积物含有不确定的骨骼残骸，有明显的运输迹象，可能来自不同的来源。另一方面，通道填充物包含一个蜥脚类动物的铰接式尸体和相关的残骸，属于准本土起源，没有明显的运输。滞后沉积物含有不确定的骨骼残骸，有明显的运输迹象，可能来自不同的来源。另一方面，通道填充物包含一个蜥脚类动物的铰接式尸体和相关的残骸，属于准本土起源，没有明显的运输。