A survey of Odonata was carried out in the central region of the state of Rio Grande do Sul: the Taquari River valley. This region was originally covered by deciduous and Semi-deciduous Atlantic Forest, which today only exist in a highly fragmented environment mainly due to agricultural activities. Our survey was conducted in 12 municipalities from this region, between March 2011 and April 2013. Aiming a general overview of the species composition, our sampling sites included lakes, bogs, small streams and river sections, all inside or surrounded by small forest fragments or forest areas. Fifty species of Odonata were collected comprising 29 genera and seven families. The dominant families were Libellulidae (40%) and Coenagrionidae (36%), while Aeshindae, Gomphidae and Lestidae each only comprise 6% of the total number of species. The findings revealed the presence of a highly diverse odonate assemblage, mainly represented by generalist species in human disturbed fragments and a few forest specialist species in the best preserved remnants only.

Here we catalog, for the first time, the known stromatolite-containing localities and morphologies found in outcrops previously attributed, by past mapping efforts, to the Lagoa do Jacaré Formation, Bambuí Group. Unlike the Sete Lagoas Formation, which has already provided several crucial samples containing a substantial variety of microbialitic forms and microfossils, the fossiliferous potential of the Lagoa do Jacaré Formation has not been properly assessed. Surprisingly, a relatively diverse variety of forms was found, including domal, various columnar, laminites and columnar-layered stromatolites. Morphological and petrographical descriptions were made and six microfabrics were unveiled, shedding light into the environmental conditions likely to have been involved in their formation.

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Abstract:Anthracological studies aim at the reconstruction of the paleoenvironment through the analysis and interpretation of macroremains of carbonized woods found in soils and archaeological sites that are related to previous human activities. The objective of this study was to compare the anthrocological and taphonomic data of the Archaeological Sites RS-T-101 and RS-T-114, located in the municipality of Marques de Souza, associated with pre-colonial occupancies of Guarani origin (archaeological sites RS-T-114 and RS-T-101, respectively, in 1,410-431 BP years and 1,411 -295 years BP, to build the environmental history of the Forqueta River basin based on taphonomic comparisons between these two sites. The traces analyzed were collected following methodology scaling and blasting, being conducted by the Archeology Section of the team's Museum of Natural Sciences of the UNIVATES University Center. In this work, the images of carbon obtained under SEM were analyzed from both sites, which were the object of previous anthrachological studies, being used to perform the taphonomic comparisons. From the images, it can be inferred that the recovered charcoals in

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