Abstract

LOPEZ DE AZAREVICH, Vanina L.; ACENOLAZA, Florencio G.; AZAREVICH, Miguel B.  and  OMARINI, Ricardo H.. Microbial And Algal Structures From The Pothic Zone In The Puncoviscana Formation, Salta Province, Argentina. Ser. correl. geol. [online]. 2010, vol.26, n.2, pp.75-84. ISSN 1666-9479.

A stratigraphic profle has been described in the Puncoviscana Formation in Palermo Oeste locality, Salta, were a 63 m-thick sequence was recognized. In the basal section was recognized the presence of microbial and algal structures. Lithofacies associations allow interpretation of the sedimentary sequence as tidal fat deposits, within which the biogenic activity had an important roll along the whole registered sedimentation period. Recognized sub-environments are shoreface and intertidal. The identifed fossil material consist of: i) diverse trace fossils indicating Nereites saltensis biofacies, ii) Kinneya, that suggests a development beneath microbial mats, iii) "Elephant skin", which development is produced on the surface of microbial mats, iv) algal structures similar to Phaeophycaceae, "Fucus" group, v) "wrinkle marks", possible associated to mixed biologic and physical process (organic/sedimentary). The recognized group of algae is developed in litoral intertidal to sublitoral zone within the photic zone, and are characteristic of warm to cold relative transparent waters. Phaeophycaceae algas has been recognized in all seas around the world and its chronological register varies between the final Ediacara and the Phanerozoic.

Keywords : Microbial mat; Algal structures; Ediacaran.

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