BY H. I. JENSEN. 81 



derived from the western slopes of the Blackall, are found in these 

 deposits, the present river not draining any such rocks. Most of 

 the alluvials brought down by the Maroochy have the character- 

 istics of the weathering products of rhyolitic rock and tuff, such as 

 would be derived from the Bottle and Glass, and Belli Creek. 

 The South Maroochy, the main stream at present, brings down 

 basaltic debris from the Blackall, and we should expect its black 

 soil alluvials to predominate. The fact that they do not is 

 suggestive of a grand river capture. Certain it is that if Kenil- 

 worth were some hundred feet higher, the whole drainage of the 

 Upper Mary River would go through the Eumundi Gap into the 

 Boonaiah. 



North of the gap the range increases gradually in altitude and 

 swings to the W.N.W., then N., then N.E., describing a semi- 

 circle. The soil, which on the Bottle and Glass was poor, is here 

 very good, mostly chocolate-coloured, being composed partly of 

 disintegrated intermediate and basic lavas. East of Mt. Cooroy 

 the formation is again sandstone with trachy-rhyolite dykes, and 

 the range becomes a mere watershed about 300 feet high, running 

 north and south, and separating the Mary Biver (Six-Mile Creek) 

 waters from those of the Noosa swamps. It has a steep fall to 

 the east, but almost no fall to the west, a feature which was 

 already noticed for the D'Aguilar Bange north of Big Hill. To 

 the west of Lake Cootharaba this watershed merges into the 

 Wahpunga Bange, whose eastern slopes overlie sandstones, and 

 have a poor soil, while its main mass and western spurs have a 

 rich chocolate soil, frequently scrub-covered, overlying soft pink, 

 bluish, yellow and white phyllites. Many of its higher points 

 have basaltic cappings. The fine agricultural lands of Kin-Kin 

 scrub are situated here. 



(e) The Maroochy Volcanic Area. — The district lying between 

 the Bottle and Glass and the Toolburra Range, and stretching 

 from the Nambour Bailway Station to the Cooroy Station, has 

 been the centre of great volcanic activity. Before settlement it 

 was very largely covered with scrubs growing luxuriantly 

 on the tuff and breccia formations which, together with lava 



