*Geoffrey Hugo Grantham¹、Conrad Adolf Groenewald¹、Riaan Bothma²、Petrus le Roux³、Kenji Horie⁴ (1.Department of Geology, University of Johannesburg, Auckland Park, South Africa、2.6 Van Broekhuizen Street Kuilsrivier 7580 South Africa、3.Department of Geological Sciences, University of Cape Town, Rondebosch, South Africa、4.National Institute of Polar Research, Tachikawa, Japan.)