Ichnology and sedimentological aspects of the Floriano Formation (Miocene of the Resende Basin), southeast of Brazil

IF 0.7 4区地球科学 Q4 PALEONTOLOGY

Revista Brasileira De Paleontologia Pub Date : 2023-10-23 DOI:10.4072/rbp.2023.3.03

Marianna da Cruz Motta, Hermínio Ismael de Araújo-Júnior, Mauricius Nascimento Menezes, Lucas Henrique Medeiros da Silva Trifilio

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Abstract

Many previous studies identified depositional systems for the Resende Basin using sedimentological and petrographic techniques. However, the lack of ichnological research leaves a gap in our understanding of paleoenvironment and paleoecology of this basin. Therefore, this study reports the first occurrence of trace fossils in the Floriano Formation (Miocene) and suggests more refined paleoenvironmental interpretations for this unit. We only observed ichnofossils in an outcrop on the RJ-161 road in Resende Municipality, Rio de Janeiro State. The deposit represents a floodplain overlayed by a crevasse splay, both sedimented in a meandering fluvial context. Trace fossils of terraphilic organisms – represented by Taenidium isp., Planolites isp. and Arenicolites isp. – were found in the fine-grained sediments of the outcrop. This ichnocoenosis is composed of feeding (fodinichnia), locomotion (repichnia) and/or habitation (domichinia) structures produced by worm-like invertebrates. The ichnotaxonomic assemblage consists of the first record of Scoyenia ichnofacies for a typical meandering fluvial system in Brazil. Keywords: continental ichnology, sedimentology, ichnofacies, paleoenvironment.

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巴西东南部瑞森德盆地中新世弗洛里亚诺组沉积技术与沉积学研究

许多前人的研究利用沉积学和岩石学技术确定了瑞森德盆地的沉积体系。然而，由于技术研究的缺乏，对该盆地古环境和古生态的认识仍存在空白。因此，本研究报道了中新世弗洛里亚诺组首次发现微量化石，并为该单元提供了更精细的古环境解释。我们只在里约热内卢州雷森德市RJ-161公路的露头上观察到鱼化石。该沉积物代表了一个被裂缝覆盖的洪泛区，两者都沉积在蜿蜒的河流环境中。陆生生物微量化石——以Taenidium isp为代表。， Planolites isp。和砂粒石。-在露头的细粒沉积物中被发现。这是由进食(fodinichnia)，运动(repichnia)和/或居住(domichinia)结构由蠕虫状无脊椎动物产生。该技术分类组合包括巴西一个典型曲流河系统的斯科耶尼亚技术相的第一个记录。关键词:大陆技术，沉积学，沉积相，古环境

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来源期刊

Revista Brasileira De Paleontologia PALEONTOLOGY-

CiteScore

1.60

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： It publishes original contributions on all aspects of Paleontology. Papers are written in English, Spanish, or Portuguese and are reviewed by international experts.