Primer registro de estromatolitos en el Maastrichtiano tardío del Grupo Chubut, Cuenca del Golfo San Jorge, Patagonia central, Argentina

IF 0.9 4区地球科学 Q3 GEOLOGY

Andean Geology Pub Date : 2020-01-31 DOI:10.5027/ANDGEOV47N1-3177

Gabriel A. Casal, Patricia Vallati, L. Ibiricu, Andrea de Sosa Tomas, Nicolás Foix, José Óscar Alllard, R. Martínez

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引用次数: 3

Abstract

The presence of stromatolites from Cretaceous outcrops at the headwaters of the río Chico locality in the Golfo San Jorge Basin is reported for the first time. They are present in the uppermost part of the Lago Colhué Huapi Formation (Coniacian-Maastrichtian) of the Chubut Group. The presence of, up to now, four structures interpreted as stromatolites in this locality are not only important because it is the first record in the basin, but because it contributes to the knowledge of these bioconstructions in continental environments. The stromatolite called E1, which is characterized and discussed in detail, is associated with an abundant and diverse fossil record represented by palynomorphs, fragments of silicified trunks, dinosaur remains and eggshells. The study, integrated mainly with the recorded pollen and spores, is important for paleoenvironmental interpretations of the site and contributes to the paleoecological and paleoclimatic understanding of the most modern stratigraphic interval of the Chubut Group.

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阿根廷巴塔哥尼亚中部圣乔治湾盆地丘布特群晚期马斯特里赫特叠层石的首次记录

首次报道了Golfo San Jorge盆地río Chico地区源头白垩纪露头的叠层石的存在。它们存在于Chubut群的Lago-ColhuéHuapi组（Coniacian-Maastrichtian）的最上部。到目前为止，该地区存在四个被解释为叠层石的结构，这不仅很重要，因为这是该盆地的第一个记录，还因为它有助于了解大陆环境中的这些生物结构。被称为E1的叠层石，经过详细的表征和讨论，与丰富多样的化石记录有关，这些化石记录以坡缕石、硅化树干碎片、恐龙遗骸和蛋壳为代表。这项研究主要与记录的花粉和孢子相结合，对该遗址的古环境解释很重要，并有助于对楚布特群最现代地层间隔的古生态和古气候理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Andean Geology 地学-地质学

CiteScore

3.90

自引率

0.00%

发文量

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.