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Taphonomy, sedimentology and chronology of a fossiliferous outcrop from the continental Pleistocene of Uruguay | |
Corona, Andrea; Perea, Daniel; Torino, Pablo; Goso, Cesar | |
通讯作者 | Corona, Andrea |
来源期刊 | REVISTA MEXICANA DE CIENCIAS GEOLOGICAS
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ISSN | 1026-8774 |
出版年 | 2012 |
卷号 | 29期号:2页码:514-525 |
英文摘要 | The La Paz local fauna (34 degrees 44’ S, 56 degrees 17’ W, elevation 31 m) is a fossiliferous assemblage with abundant remains of typical southern South American Pleistocene mammals. The assemblage consists of a bonebed, containing a high concentration of skeletal remains, most of them completely disarticulated and fragmented, although very well preserved, and is unique in Uruguay as most remains have been found as single isolated finds until now. The goals of this study are to determine the sedimentary and taphonomic processes that produced this regionally unique concentration of bones and determine the age of the deposit. The bone fragments studied are not in their original anatomical position and consist of mostly, very fractured specimens accumulated in a multidominant bonebed. The number of identified specimens (NISP) is 130. Within the recovered sample, 50% of the studied specimens showed no signs of weathering; 70% showed some kind of fracture or breakage, many of the specimens (40%) parallel to the major axis; and a small number of specimens showed signs of abrasion (5%). Based on the sample there does not appear to have been selection (either by form or by size) by transport. The dominantly massive deposit lacks sedimentary structures, has poor sorting and a high degree of angularity of the largest pebbles suggesting that the final deposition of the remains resulted from a mudflow and were not channeled deposited. The taphonomic features observed on the bones are also compatible with this depositional process. The sediments in which the bonebed is located are attributed to the Libertad Formation, currently assigned to the lower-middle Pleistocene by other workers. We discuss the validity of the two available radiocarbon ages in the context of many failed essays. The mammals of the La Paz local fauna and the presence of particular clay mineral allow us to infer, in the context of this deposit, an arid to semi-arid environment. |
英文关键词 | Quaternary bonebed taphonomy Libertad Formation Uruguay |
类型 | Article |
语种 | 英语 |
国家 | Uruguay |
收录类别 | SCI-E |
WOS记录号 | WOS:000307024100016 |
WOS关键词 | SOUTH-AMERICA ; PROBOSCIDEA ; ARGENTINA ; EVOLUTION ; BONES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/174905 |
作者单位 | Univ Republica, Fac Ciencias, Dept Evoluc Cuencas, Montevideo 11400, Uruguay |
推荐引用方式 GB/T 7714 | Corona, Andrea,Perea, Daniel,Torino, Pablo,et al. Taphonomy, sedimentology and chronology of a fossiliferous outcrop from the continental Pleistocene of Uruguay[J],2012,29(2):514-525. |
APA | Corona, Andrea,Perea, Daniel,Torino, Pablo,&Goso, Cesar.(2012).Taphonomy, sedimentology and chronology of a fossiliferous outcrop from the continental Pleistocene of Uruguay.REVISTA MEXICANA DE CIENCIAS GEOLOGICAS,29(2),514-525. |
MLA | Corona, Andrea,et al."Taphonomy, sedimentology and chronology of a fossiliferous outcrop from the continental Pleistocene of Uruguay".REVISTA MEXICANA DE CIENCIAS GEOLOGICAS 29.2(2012):514-525. |
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