1. Earth Sciences Cenire, University of Goieborg, Guldhedsgaran 5a. S-413 81 Goteborg. Sweden;
2. Fjolbrautarskoli Vesiurlands, Is-300 Akranes, Iceland;
3. Department of Crypiogamic Botany, Swedish Museum of Naiural History, Box 50007. S-104 05 Slockholm, Sweden;
4. Department of Quaiernary Geology. Lund University, Tornauagen 13, S-223 63 Lund, Sweden;
5. Instituio Anrrirrico Argeniino, Cerriio 1248. I010 Buenos Aires, Capiial, Argentina;
6. Geological Institute, Uniuersity of Rergen, Allegi. 41, N-5007 Bergen, Norway.