1. Laboratory of Sedimentary Geology (Lagesed) Department of Geology Institute of Geosciences Federal University of Rio de Janeiro Rio de Janeiro 21941‐916 Brazil
2. Department of Geosciences and Geography Faculty of Science University of Helsinki Yliopistonkatu 4, 00100 Helsinki Finland
3. Geological and Mining Institute of Spain IGME C/Rios Rosas 23 Madrid 28003 Spain
4. Fac. CC. Geológicas Universidad Complutense de Madrid C/ José Antonio Novais, 12 Madrid 28040 Spain