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A new succession of diamictites and siltstones has been found within the Araras Group and is interpreted to record Ediacaran glaciation in the northern Paraguay Belt, Brazil. This discontinuous stratigraphic unit, named the Serra Azul Formation (Fm.) (Figueiredo et al. 2005; Alvarenga et al. 2007), is up to 300 m thick. It lies above dolomites of the Nobres Fm. and below sandstones of the Raizama Fm. At the stratotype section, the Serra Azul Fm. comprises c. 70 m of massive glacial diamictites, overlain by 200 m of laminated siltstones and rhythmites that contain sparse intercalations of very fine sandstone lenses.

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