He is a graduate in Geography of the University of Wales and came to Tasmania in 1954; since then his main work has been on the morphogenesis of coastlines, for which he gained his doctorate at the University of Birmingham. His approach to the geomorphology of Tasmania has been mainly a morphoclimatic one. D r M. J. J. Bik, is a Senior Research Scientist of the Geographical Branch, Department of Mines and Technical Surveys, Ottawa. He studied physical geography in the University of Amsterdam where his doctoral dissertation treated of the glacial landforms and deposits in part of the Austrian Alps. As Geomorph ologist with the Division of Land Research, CSIRO, he took part in a resources survey in New Guinea on which this essay is based.J. G. Speight, Research Scientist, Division of Land Research, CSIRO, gradu ated in Geology at the University of Canterbury in New Zealand and had some training in river hydrology before coming to Australia. His studies of river behaviour arise from regional surveys in Papua and New Guinea and from a broader concern with quantitative geomorphology. D avid S. Simonett, Associate Professor of Geography, University of Kansas, has strong interests in geomorphology and soil-forming processes in the humid tropics.