846 GEOLOGY OF GLASS HOUSE MTS. AND DISTRICT, 



of iiiterbedded sandstones, shales and conglomerates, which is 

 apparently continuous and identical with the Ipswich and Burrum 

 Coal Measures. This formation is devoid of fossils excepting the 

 very abundant silicified wood and a few ill-preserved leaves. In 

 this paper it will be termed the Coal Measure Formation, 

 identical with the Trias-Jura of Jack. 



The above-mentioned Palaeozoic rocks are put down by Jack 

 as " Gympie Formation," but they may be much older. No 

 fossils have as yet been found in them. 



The rocks of the Coal Measure Formation are not horizontally 

 bedded. On the contrary, they dip at varying angles, and form 

 small anticlines and synclines. In places trachyte intrusions have 

 served to bring about this result. The northern part of the 

 D'Aguilar Range bears every appearance of being an anticlinal fold. 

 This part of the range (lying north of Steep Hill) is between 500 

 and 800 feet in average height, and is composed of sandstones and 

 conglomerates of the Coal Measure Formation, which do not 

 present to the eye signs of great erosion, such as steep clifts and 

 escarpments, a feature so noticeable in the Hawkesbury formation 

 of the Sydney basin. The strata dip (as far as my observations 

 go) away from the summit of the range Towards Peachester, west 

 of the range, sandy soil overlying sandstone occurs as on the east. 

 The same formation continues northwards to the Blackall Ranges, 

 where it has been fissured and partly covered by flows of basalt. 

 The sandstones differ greatly in colour and texture, ranging from 

 fine argillaceous sandstones to coarse conglomerates, and varying 

 in colour from white to red. Some varieties are highly ferru- 

 ginous, becoming a "sand-ironstone." Interbedded with them I 

 have found white clay shales, as at Mewett's Mountain, near the 

 Six-Mile Creek, and also near Mt. Tunbubudla, black carbonaceous 

 shale in the bed of the Six-Mile Creek, about a quarter of a mile 

 east of the railway line, and coarse conglomerates near Mt. 

 Beerwah. Coal is said to occur to the north west of Mt. Mellum; 

 and also in several places in the Stanley River basin, south of 

 the Blackall Range. 



