Abstract
Quartzite pebble and cobble-sized particles from an arenaceous siltstone with fine sandstone lenses have been found at two localities in the Campos Gerais region, Apucarana Sub-Basin (Paraná Basin), south Brazil. These particles were first interpreted as glacial diamictites, but their smooth surfaces and surrounding sediments indicate another origin. Two of the pebbles are associated with a small scale hummocky cross stratification in the top layer, and with fine sandstone layers below, which is indicative of currents formed by oscillatory flow. None of the particles show any traces of encrustation, and their morphology suggests they have been formed in a fluviatle environment. The surrounding siltstone is affected by bioturbation and contain brachiopods (Australospirifer). Palynomorphs indicate that these storm deposits were formed during an early Emsian maximum inundation on a transgressive ravinement surface.
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