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首页> 外文期刊>Palaios: An International Journal of the Society of Economic Paleontologists & Mineralogists >FLOODPLAIN TAPHONOMIC MODE OF EARLY MIOCENE VERTEBRATES OF SOUTHERN PATAGONIA, ARGENTINA
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FLOODPLAIN TAPHONOMIC MODE OF EARLY MIOCENE VERTEBRATES OF SOUTHERN PATAGONIA, ARGENTINA

机译：阿根廷南塔哥尼亚州初期内科脊椎动物的洪泛平原模式

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摘要

A continental assemblage of fossil mammals from the Santa Cruz Formation (early Miocene, Burdigalian) recovered from the coast of the Santa Cruz Province (Anfiteatro locality), Argentina, was evaluated taphonomically. Due to its stratigraphic position and age (similar to 17.5 Ma), the fossiliferous level corresponds to the lower section of the Estancia La Costa Member (lower part of the Santa Cruz Formation). The Anfiteatro assemblage (Santacrucian South American Land Mammal Age) is dominated by mammals, but some birds and carnivore coprolites were also recorded. The recorded taphonomic features and the sedimentological interpretation suggest that the bone remains were preserved in a floodplain related to a fluvial system influenced by volcaniclastic input. The assemblage was interpreted as a result of death of mammals over a short period of time. The residence time of carcasses on the surface was variable. Although most bones were quickly buried, the exposure was sufficiently long for the disarticulation and scattering of different skeletal components and the agency of other processes (e.g., trampling, weathering). The loss of skeletal elements is linked to the action of water flows generated in the plain, during overbank floods or rainfalls, which mobilized those elements more susceptible to transport. After burial, the specimens were affected by diagenetic processes (e.g., soil corrosion, infilling, impregnation, deformation). The taphonomic evaluation of the Anfiteatro locality provides a framework for the analysis of other fossil assemblages with similar features worldwide.
机译：从圣克鲁斯省（Anfiteatro地区），阿根廷的Santa Cruz Childion（早期内科，Burdigigal）中，从圣克鲁兹省（Anfiteato Pocalitalitalitalitalial）（Anfiteata Pocalitial），阿根廷的海岸，陆上大陆组合化石哺乳动物被评估。由于其地层位置和年龄（类似于17.5 mA），化纤水平对应于estancia La Costa成员的下部（Santa Cruz形成的下部）。 Anfiteatro组装（Santacrucian南美洲土地哺乳动物年龄）由哺乳动物主导，但还记录了一些鸟类和食肉动物群。记录的术语特征和沉积物解释表明，骨仍然被保存在与受火山痉挛投入影响的河流系统相关的洪泛区中。在短时间内，组合被解释为哺乳动物死亡。屠体在表面上的停留时间是可变的。虽然大多数骨骼被迅速埋下，但暴露的暴露足够长，用于不同骨骼成分和其他方法的原子能机构（例如，践踏，风化）。骨骼元素的损失与平原中产生的水流的作用有关，在过度覆盖洪水或降雨期间，这些元素调动更容易运输的元素。埋葬后，标本受重成对过程的影响（例如，土壤腐蚀，缺陷，浸渍，变形）。 ANFiteAtro位置的TawhonoMic评估为分析其他化石组合的框架提供了一个全球相似的特色。

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