80 VOLCANIC AREA OF EAST MORETON, ETC., DISTRICTS, Q., 



itself is frequently seen to overlie or intrude Trias-Jura sandstone. 

 The volcanic rocks cap the Trias-Jura and one another uncon- 

 formably, often intilling erosion hollows, a fact also noted for 

 the Mt. Mee basalt. 



West of the Range the Mary River flows in a valley having, at 

 Conandale, an elevation of about 500 feet. Its tributaries from 

 the Blackall Range have cut deep gorges, and have frequent 

 waterfalls. The main river rises in the Conandale Range and 

 flows through a narrow V-shaped valley cut in the granite country 

 to Kenilworth, wherein softer formations (phyllites and volcanic 

 tuffs) it has formed a broad valley with smooth and well rounded 

 hills and slopes. 



North of Mapleton the Blackall ceases to be a tableland, and 

 becomes a rugged mountain range, known as the ' The Bottle and 

 Glass.' This is composed of highly disturbed sandstone and acid 

 eruptive rocks, including great masses of tuff and breccia. 

 FWest vegetation prevails. The Bottle and Glass has a height of 

 from 1,000 to 1,200 feet, and comes to a sudden end west of Mt. 

 Eerwah, where the range drops precipitously about 800 feet to 

 form a mere watershed (c.400 feet high) between Belli Creek and 

 the Boonaiah (North Maroochy). The Eumundi Gap, as this 



Fig. 5. -Sketch Section from Yandina to Nmdherry, 

 following an irregular course. 



break might be called, probably marks the former course of the 

 Belli Creek and Upper Mary waters. The North Maroochy at 

 Yandina (Text fig. 5 ) has extensive gravel, boulder, clay and other 

 deposits, extending many hundred feet on either side of the river. 

 These immense masses were never brought down by the present 

 insignificant stream. Pebbles of slaty and granitic rock, clearly 



