15:00 〜 15:15
*Grantham Hugo Grantham1、Adam Bumby2、Neogracious Moabi3、Riaan Bothma1 (1.Department of Geology, University of Johannesburg, Auckland Park, South Africa、2.Department of Geology, University of Pretoria, Hillcrest, Pretoria, South Africa、3.Council for Geoscience, P/Bag X112, Pretoria, South Africa.)