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1. Laboratory of Palynology, Lutheran University, Canoas/RS, CEP 92420-280, Brazil; 2. Laboratory of Microscopic Electronics, Lutheran University, Canoas/RS, CEP 92420-280, Brazil; 3. Institute of Geosciences, Federal University of Rio Grande do Sul, CEP 91501-970, Brazil; 4. Institute of Geosciences, University of Tuebingen, Tuebingen D-72076, Germany |