review of the stratigraphic and radioisotope evidence from those regions that supported Wegener's ideas, A Geological Comparison of South America with South Africa (1927). His best-known publication, Our Wandering Continents (1937), expanded and improved this work and, departing somewhat from Wegener, proposed two original supercontinents separated by the Tethys Ocean, a northern/equatorial Laurasia and a southern/polar Gondwanaland. Awards and honours In 1933, du Toit was awarded the Murchison Medal by the Geological Society of London, and in 1943, he became a Fellow of the Royal Society. In 1949, the year after his death, the Geological Society of South Africa inaugurated a biennial lecture series in his honour that continues to the present day. In 1973, a 75 km crater on Mars (71.8°S, 49.7°W) was named "Du Toit" in recognition of his work. Significant works du Toit, A.L. (1926) The Geology of South Africa, Oliver & Boyd, London, UK du Toit, A.L. and Reed, F.R.C. (1927) A Geological Comparison of South America with South Africa, Carnegie Institution of Washington, Washington, USA du Toit, A.L. (1937) Our Wandering Continents; An Hypothesis of Continental Drifting, Oliver & Boyd, London, UK References External links Biography (Charles H. Smith, Western Kentucky University) Alexander du Toit's map of two ancient supercontinents (more details here; Hartebeesthoek Radio Astronomy Observatory) Alexander du Toit papers and letters archive (University of Cape Town) 1878 births 1948 deaths South African geologists Tectonicists University of Cape Town alumni Alumni of Diocesan College, Cape Town Fellows of the Royal Society Presidents of the South African Archaeological Society Presidents of the Geological Society of South Africa