1. Department of Geology; Tallinn University of Technology; Ehitajate tee 5 19086 Tallinn Estonia
2. Czech Geological Survey; Geologická 6 15200 Prague 5 Czech Republic
3. Department of Geology; Lund University; Sölvegatan 12 SE-223 62 Lund Sweden
4. IANIGLA; CCT CONICET Mendoza; A. Ruiz Leal s/n Parque General San Martín M5502IRA Mendoza Argentina
5. IITCI-CONICET; Departamento de Geología y Petróleo; Universidad Nacional del Comahue; Buenos Aires 1400 Q8300IBX Neuquén Argentina