008 PRESIDENT S ADDRESS. 



break covered with basalt flows. Here these rocks are associated 

 with rhyolites, dacites, aiidesites and basalts. Necks and plugs, 

 forming gigantic monoliths (Coolum Mt., Mt. Cooran, Mt. 

 Cooroora, Mt. Eerwah, (tc), and belonging to this group, were 

 found at intervals between the coast on the east and the Blackall 

 Range on the west, the Maroochy River on the south, and 

 Kin-Kin Creek on the north. 



In the D'Aguilar Range he discovered on and around Mount 

 Mee an interesting series of metamorphic rocks, including glauco- 

 phane and anthophyllite schists, rutile and cyanite granulites, and 

 allied rare rocks. Further westward, on the Stanley River at 

 Neurum, he found numerous rhyolite and pitchstone peaks (Mt. 

 Archer, ifec). The metamorphic rocks of the D'Aguilar Range were 

 found to be traversed by dykes of solvsbergite and keratoiDhyre. 

 Many interesting physiographical problems were studied, and 

 the observations made upon raised beaches, the enormous sand 

 hills along the coast at Noosa River, and the great Coolum 

 swamps and coastal lakes at Noosa should prove of interest. An 

 important fact noticed was the occurrence of great igneous 

 intrusions of porphyrite at Pt. Ark w right, and of true quartz 

 diorite at Noosa Head into the Triassic sandstones. 



On his return to Sydney Mr. Jensen sectioned and examined 

 under the microscope the rocks collected upon the excursion, and 

 spent some time writing up his results, making maps, and drawing 

 ideal sections of the district. 



In October he again left Sydney, going this time to the 

 Warrumbungle Mts., where he made a preliminary trip through 

 the district, going completely round the mountain mass, and 

 making incursions to the centre of the group from Coonabarabran, 

 Tannabar, \V argon Creek, Tooraweanah and Bugaldi. He was 

 able in this way to construct a rough geological map of the 

 district, which will serve as an excellent basis for further work 

 this year. The nature of the volcanic rocks which range from 

 trachyrhyolite to basalt, and their relations to the Triassic and 

 Permo-Carboniferous sedimentary rocks of the district, were 

 investigated as closely as time would permit. A new diatomaceous 



