Deglaciation sequences in the Permo-Carboniferous Itararé Group, Paraná Basin, southern Brazil Fernando Farias Vesely a, *, Mario Luis Assine b a UFPR- Universidade Federal do Paraná, Laboratório de Análise de Bacias e Petrofísica, Centro Politécnico, Caixa Postal 19027, CEP 81531-990, Curitiba-PR, Brazil b UNESP - Universidade Estadual Paulista, Departamento de Geologia Aplicada, Avenida 24-A, 1515, CEP 13506-900, Rio Claro-SP, Brazil ABSTRACT The Late Carboniferous to Early Permian Itararé Group is a thick glacial unit of the Paraná Basin. Five unconformity-bounded sequences were defined in the eastern outcrop belt, which were also recognized in well-logs along 400 km across the central portion of the basin. Deglaciation sequences are present in the whole succession and represent the bulk of the stratigraphic record. The fining-upward vertical facies succession is characteristic of retrogradational stacking pattern and corresponds to the stratigraphic record of major ice retreat phases. Laterally discontinuous subglacial tillites and boulder beds may occur at the base of the sequences. When these subglacial facies are absent, deglaciation sequences lie directly on the basal disconformities. Commonly present at the lowermost portions of the deglaciation sequences, polymictic conglomerates and cross-bedded sandstones are generated in subaqueous proximal outwash fans in front of retreating glaciers. The overlying assemblage of diamictites, parallel-bedded and rippled sandstones and Bouma-like facies sequences are interpreted as deposits of distal outwash fan lobes. The tops of the deglaciation sequences were positioned in clay-rich marine levels that show little (fine- laminated facies with dropstones) or none evidence of glacial influence on deposition and are considered the periods of maximum ice retreat. Keywords: deglaciation sequences; Permo-Carboniferous; Itararé Group; Paraná Basin ∗ Corresponding author. Tel.: +55-41-3613704; fax: +55-41-3613642. E-mail address: vesely@ufpr.br