Nuevos sitios fosilíferos y evolución paleoambiental del cenozoico tardío del suroeste de Córdoba, Argentina

IF 0.9 4区 地球科学 Q3 GEOLOGY
A. Tauber, F. Alvarez, G. Martínez, José Augusto Haro, J. Krapovickas, G. Nieto
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引用次数: 0

Abstract

New fossil remains were found in Neogene and quaternary sedimentary sequences exposed in Alpa Corral and río San Bartolomé localities (Rio Cuarto Department, Córdoba, Argentina). They were assigned to Nopachtus cabrerai (Xenarthra, Cingulata, Glyptodontidae), Notiomastodon platensis (Proboscidea, Gomphotheriidae) and cf. Trigodon gaudryi (Notoungulata, Toxodontidae), and traces of the Scoyenia ichnofacies, as Taenidium barretti, were identified. Based on these findings, we conclude that: 1, the species Nopachtus cabrerai and cf. Trigodon gaudryi are registered for the first time in the Sierras Pampeanas region and support (along with the rest of the known taxa) a clear faunistic similarity to the Pampean region; 2, the beginning of the Neogene sedimentation in the Alpa Corral area (Las Barrancas river and San Bartolome river) would have started during the early Pliocene (Montehermosan Age); 3, the paleoenvironment would have been a fluvial system, with meandering canals interspersed with paleosols developed in floodplains with overflow deposits or abandoned meanders; 4, the paleontological and sedimentary record suggests a well-marked diachronism (from west-southwest to east-northeast) between the beginning of the Neogene sedimentation in the southern sector of San Alberto valley (late Miocene [Huayquerian Age]), the Alpa Corral region (early Pliocene [Monthermosan Age), and Río La Cruz valley (late Pliocene [Chapadmalalan Age]).
阿根廷科尔多瓦西南部晚新生代新化石遗址与古环境演变
在Alpa Corral和río San Bartolomé地区(阿根廷科尔多瓦的Rio Cuarto省)暴露的新第三纪和第四纪沉积序列中发现了新的化石遗迹。它们被分为卡氏Nopachtus cabrerai(异齿目、Cingulata、Glyptodontidae)、Notiomastodon platensis(长鼻目、Gomphotheridae)和比较Trigodon gaudryi(Notoungulata、Toxodontidae),并鉴定出Scoyenia遗迹相的痕迹,如Taenidium barreti。基于这些发现,我们得出结论:1,Nopachtus cabrerai和C.Trigodon gaudryi物种首次在Sierras Pampeanas地区登记,并支持(与其他已知分类群一起)与Pampean地区在动物区系上的明显相似性;2、Alpa Corral地区(Las Barrancas河和San Bartolome河)的新第三纪沉积始于上新世早期(蒙特赫莫桑时代);3、古环境应为河流系统,蜿蜒的运河中穿插着在泛滥平原上发育的古土壤,其中有溢流沉积物或废弃的曲流;4,古生物学和沉积记录表明,在圣阿尔贝托山谷南部的新第三纪沉积开始(中新世晚期[华克时代])、Alpa Corral地区(上新世早期[蒙赫莫桑时代])和Río La Cruz山谷(上新世晚期[查帕德马拉兰时代])之间存在明显的年代交替(从西南偏西到东北偏东)。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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