in South-Central Western Australia. 309 



the south and east by sand plains and sand dunes. The prevailing 

 wind is stated to be north-westerly.^ 



IImma?i's Za/ce, south-east of Kalgoorlie. Honman's maps and 

 descriptions'^ show tliat rock-cliffs and rock-floors occur on the 

 western shore of the lake, and sand dunes and sand plains on the 

 southern and south-eastern shores, the material forming the dunes 

 and plains being blown from the north-west. Honman also refers 

 (p. 36) to the migration of the lake to the north-west owing to this 

 removal of material. 



Zaices Carey, Raeside, Rebecca, and, Goongarrie. — These lakes form 

 a remarkable group. They all lie to the east of the railway line 

 running north from Kalgoorlie to Leonora, Lake Carey being the 

 most easterly and Lake Gfoongarrie the most westerly. Lakes Carey, 

 Raeside, and Rebecca have been mapped and described by Honman, 

 who states* that they all run north-west and south-east; that all 

 have escarpments and rock-floors on the western sides and sand dunes 

 on the eastern ; that the rock flooring on the western side is probably 

 due to migration ; and that the fact that the rock-flooring is on the 

 Avestern side in the case of every lake in the district is probably due 

 to the prevailing direction of the wind being from the south-west.* 

 The writer can confirm from personal observation the occurrence of 

 rock-clifls and floors on the western side of Lake Raeside and their 

 absence, in the areas seen by him, on the eastern. The writer's 

 observations in regard to Lake Goongarrie, which trends north and 

 south, sliow that rock-cliffs and rock-floors occur on tlie western 

 side, and sand plains and sand dunes on the eastern. The dominant 

 winds appear to be westerly. Another moderately large lake, west 

 of Lake Goongarrie and of the railway line, has not been examined 

 by the writer. 



Zaices north of Southern Cross. — T. Blatchford^ points out that 

 wind-blown deposits occur on the southern or south-eastern edges of 

 the lakes, the northern and western shores being usually more or less 

 precipitous Avith bare rock-floors or covered with very thin deposits. 

 He concludes that the lakes are migrating westward, and from his 

 remarks the prevailing winds ar« probably north-westerly. 



The Johnson Zaices, Bremer Range. Honman " in referring to these 

 lakes states that on the north-western side are found hard rock 

 outcrops and cliffs, and on the south-eastern blown sand and gypsum, 

 forming wide sandy slopes and dunes, due to wind action. 



1 Op. cit., p. 11, fig. 1. 



2 Bull. 66, Geol. Surv. W. Austral., 1916, pi. i, pp. 11, 36. 



3 Bull. 73, Geol. Surv. W. Austral., 1917, pp. 17-19. 



* It might here be noted that Honman accepts J. W. Gregory's theory on the 

 lakes as .a whole as dismembered river systems. See Bull. 71, 1917, p- 144, 

 and Bull. 73, 1917, p. 17, Geol. Surv. W. Australia. He also notes (Bull. 71, 

 p. 15) that Lakes Carey, Eaeside, and Eebecca cross the strike of the rocks, 

 and suggests that these lakes may belong to a different cycle of erosion un- 

 influenced by geological structure. On the ancient river theoiy, it could be 

 contended in explanation of this feature that the old streams were superposed. 

 The question cannot be discussed here. It will be dealt with elsewhere. 



^ Bull. 71, Geol. Surv. W. Austral., 1917, pp. 23, 24. 



"" Bull. 59, Geol. Surv. W. Austral., 1914, p. 195. 



