1. Institut für Planetologie; Wilhelm-Klemm-Str. 10 Münster 48149 Germany
2. Department of Applied Geology; Curtin University of Technology; GPO U1987 Perth Western Australia 6845 Australia
3. Department of Earth and Space Sciences; UCLA; 3806 Geology Los Angeles California 90095 USA
4. Institute of Geophysics and Planetary Physics; UCLA; 3845 Slichter Hall Box 951567 Los Angeles California 90095 USA
5. Institute of Meteoritics; University of New Mexico; 221 Yale Blvd NE 313 Northrop Hall Albuquerque New Mexico 87131 USA
6. Rieskratermuseum Nördlingen; Eugene-Shoemaker-Platz 1 Nördlingen 86720 Germany