424 Reviews — Western Australia — 



lithography by Messrs. George Philip and Son, embodies not only 

 the work of those earlier geologists, to whose labours we have briefly 

 referred above, but gives a vast amount of information derived 

 from careful geological field-work, which Mr. Woodward has 

 accomplished during numerous expeditions, extending over the 

 past seven years. 



The largest additional areas coloured geologically extend from 

 north of Pilbarra (lat. 20° South) to the Murchison ; and the great 

 area enclosing the Wyndham and Kimberley gold-fields in the 

 extreme north-eastern territory, and the region about Albany, and 

 towards Eucla in the south. 



Taking the whole area of the colony at 976,000 square miles, 

 about one-half of this has now been 'provisionally surveyed and 

 geologically coloured on the Map. The major part of this explored 

 area extends along the coast, and may be said to comprise a belt 

 about 250 to 300 miles broad, reaching from Condon, north of 

 Pilbarra, down to Cape Howe in the south, a stretch of country 

 rather over 1000 miles in length. A second and minor area is 

 that of the Kimberley Division in the extreme north-east of the 

 colony, also geologically coloured on the present Map, embracing an 

 area of probably not less than 67,000 square miles. The former 

 and major area may be roughly divided into a broad belt 100 miles 

 in width, and 600 in length, of volcanic rocks (granite and basalt), 

 flanked on the west by a band, 50 to 100 miles broad, of crystalline 

 schists and granite, and on the east by a belt of metamorphic rocks, 

 clay slates, quartzites, etc., in which the principal gold-fields are 

 situated. These highly altered rocks also extend for some 300 miles 

 along the coast to the east of Albany, being covered inland by 

 sands, limestones, and clays of Tertiary age, which stretch for 600 

 miles eastwards to Eucla, and 200 miles inland to the northward 

 towards the Dundas and Coolgardie gold-fields. 



At Fly Brook, and on the Collie River, Coal-beds, believed to be 

 of Carboniferous age (but possibly younger), occur; and again on 

 the Irwin, and probably on the Murchison also. 



From here rocks of Carboniferous age, usually fossiliferous, extend 

 in a northerly direction, about 50 miles from the coast, in a belt 

 20 miles wide, and covering a still larger area to the north-east, 

 and again making their appearance on the south side of the 

 Kimberley gold-field, and outcropping along the edge of the basalt 

 flow, between Mt. Elder and the Antrim Plateau. Notwithstanding 

 the larger area over which these formations are known to extend, 

 very few beds of the series are exposed, being but little disturbed or 

 faulted, and lying nearly always in a horizontal position. 



In the Ashburton, Pilbarra, and Kimberley Districts, Cambrian, 

 Silurian, and Devonian rocks occur, especially in the higher ranges. 



The Stirling range, to the north of Albany, is probably also of 

 Silurian age. Chalky limestones with flints forming the Lower 

 Cretaceous beds occur at Gingin, 50 miles to the north of Fremantle, 

 and extend for 600 miles, more or less, uninterruptedly to Onslow, 

 on the Ashburton River. To the Cretaceous age is also attributed 



