| Affiliation: | (1) US Geological Survey, Denver, Colorado, USA;(2) Department of Geology, Wollongong University College, Wollongong, NSW, Australia;(3) Department of Applied Earth Sciences, Stanford University, Stanford, California, USA;(4) Northrhine-Westphalia Geological Survey, Krefeld, West Germany;(5) MRC Unit, University of Leicester, Leicester, England;(6) Department of Statistics, University of the Witwatersrand, Johannesburg, South Africa;(7) Smithsonian Institution, Washington, D.C., USA;(8) Department of Geology, Syracuse University, Syracuse, N. Y., USA |
