 Keith Tinkler has suggested that the word came into general use in English, German and French after John Wesley Powell and W. J. McGee used it during the International Geological Conference of 1891.John Edward Marr in his The Scientific Study of Scenery considered his book as, 'an Introductory Treatise on Geomorphology, a subject which has sprung from the union of Geology and Geography'.An early popular geomorphic model was the "geographical cycle" or "cycle of erosion" model of broad-scale landscape evolution developed by William Morris Davis between 1884 and 1899.