The impact of microbial mats in promoting record of Maastrichtian crocodylomorph tracks from Yacoraite Formation, Argentina

IF 1.9 3区 地球科学 Q1 GEOLOGY
Alfredo Alejandro Martín , Silvina de Valais , Ignacio Díaz-Martínez , Patricio Guillermo Villafañe , Gabriel Ricardo López Isla , Paolo Citton
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引用次数: 0

Abstract

Here we report tetrapod tracks from a stratigraphic level of Maastrichtian age in the Yacoraite Formation (Maimará ichnosite, Jujuy Province, Argentina). The ichnological material consists of convex hyporeliefs whose formation was induced by growth of microbial mats in an upper subtidal-lower intertidal setting. Ichnological features that are recognized in tracks and traces allowed to include them into the categories of ‘punting tracks’ and ‘buoyancy tracks’. These categories suggest swim behaviours of the producers, which are tentatively interpreted as crocodylomorphs. Reconstruction of the filling process leading to tracks preservation and inclusion into the geological record enabled reconstructing at least two different phases of mats development, one dominated by chemical precipitation and the other by trapping and binding of coated grains and other particles. These two phases of mat growth are related to slightly changing energetic conditions of the palaeoenvironment and further support a marine origin for the unit. Finally, it is suggested that biologically induced, in-situ mineral precipitation promotes fast formation of overtracks through early lithification achieving preservation of tetrapod tracks well before their complete filling.

微生物垫对促进阿根廷亚科拉特地层马斯特里赫特鳄科动物足迹记录的影响
在此,我们报告了亚科拉特地层(阿根廷胡胡伊省迈马拉岩石化石)中马斯特里赫特时代地层中的四足动物足迹。这些痕石材料由凸起的次凸起组成,其形成是由上潮下潮间带环境中微生物垫的生长引起的。从足迹和痕迹中发现的技术特征可将其归入 "打点足迹 "和 "浮力足迹 "类别。这些类别表明了生产者的游泳行为,初步解释为鳄形目动物。通过重建导致足迹保存下来并被纳入地质记录的填充过程,至少可以重建垫层发展的两个不同阶段,一个阶段以化学沉淀为主,另一个阶段则以包裹的谷物和其他颗粒的捕获和结合为主。垫层生长的这两个阶段与古环境能量条件的轻微变化有关,进一步支持了该单元的海洋起源。最后,研究人员认为,生物诱导的原位矿物沉淀通过早期岩化促进了过道的快速形成,从而使四足动物的足迹在完全填充之前就得以保存。
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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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