REPORTS OF RESEARCH COMMITTEES. 331 



of which probably occur in the Pilbara district). Woodward (41) 

 notes the bifurcation of the Darling Fault Scarp, both to the north 

 und to the. south of Perth ; and also describes another north-south 

 fault scarp between the Bailing and Naturaliste scarps, which he 

 terms the Dunsborough-Augusta Scarp. He also suggests (40) 

 that subsidence has taken place along the Darling Fault since the 

 formation of the ancieait coastal sand dunes. 



8. SuNKLANDS. — Jutson (14) records the work of Jack, Saint- 

 Smith, and Blatchford, indicating the existence of the Collie and 

 Moora Sunklands, and also notes the Perth Sunkland. 



9. Drowned Valleys and Plains. — Jutson (12. 14) notes their 

 existence at Perth and Albany, and in the North- West and Kim- 

 berley districts. Jutson and Simpson (29) give details concerning 

 Albany. 



10. Recent Slight Elevation. — Jutson (14) records the work 

 of previous observers, which shows that a slight elevation had 

 taken place at various points on the coast. Somerville (34) gives a 

 variety of evidence indicating similar elevation at Perth. 



11. Coastal Plains. — Maitland (30) refers to the coastal plains 

 of the west and of the south. Jutson (12), following Saint-Smith, 

 describes the Sw^an Coastal Plain, and points out that at Perth it 

 appears to be part of a great sinking basin. Woolnough (4.5) 

 describes the physiographic elements between the summit of the 

 Darling Peneplain (ac'ross the Swan Coastal Plain) and Rottnest 

 and other islands. He divide® the coastal plain intO' the piedmont 

 belt, the sandy plain tO' the west (composed of sand dunes of 

 seolian origin), with intervening swampy areas, a zone of north- 

 south lakes, and a zone of coastal limestone (formed by aeolian 

 action with subsequent consolidation). 



12. Sub-surface Drainage. — Aurousseau (1) shows that on the 

 soil-covered slopes of the Darling Range and of the piedmont 

 deposits a series of holes and trenches occur, which indicate sub- 

 surface drainage. These lines are due to fissures forming in 

 summer beneath the soil. Rain finds its way to the fissures, along 

 which it flows. The fissures widen, and the roofs collapse. 



13. Relation of Physiography to Mining and Prospecting 

 IN Western Australia. — Jut?on (28) discusses the physiography 

 in relation to the discovery and working of metalliferous lodes, 

 coal and alluvial deposits, and in relation to transportation and 

 water supply. 



Note. — The writer regrets that two papers have not been available to him for summarizing. 

 One is by Dr Woolnough on the Stirling Range (in course of publication by the Royal Society 

 of New South Wales), and the other by Messrs. Aurousseau and Budge on the river-terraces of 

 the Swan at Guildford (in course of publication by the Royal Society of Western Australia). 



