BY II. I. JEX8i:X. 69 



the dip is generally S.AV. or W.S. W. at moderate or high angles. 

 To the we^st of the fault most of the observed dips are at low 

 angles (Walloon Series). If this fault were absolutely linear, it 

 would pass almost through the summit of Mt. Flinders, but, 

 from the tendenc}- to strong westerly dips west of Mt. Flinders, 

 it is concluded that the main fault swings round to follow a more 

 meridional direction. 



The Walloon Series are .so slightly inclined that outcrops are 

 seldom met with. The Coal beds, which are mined near Ipswich, 

 probably occur here at considerable depth. The preservation 

 over this area of the newer beds of the Ipswich Formation is due 

 to their downthrow, and the older Series has been exposed east 

 ol the great fault-line by faulting and overthrust-folding. In the 

 Parishes of Thorn, Normanby, and Fassifern, west of Mt. Flinders, 

 the Coal Measures belong to the Walloon Series and are exten- 

 sively covered with basalt-flows. The faulting, which is so 

 extensive in the Ipswich district, probably dies out to the south 

 of Mt. Flinders, or at all events it becomes less pronounced; it 

 appears to me to be due to the fracturing of an anticline by faults 

 parallel to its axis. South and south-east of Mt. Flinders a 

 number of rather flat-topped hills exist, which I take to be 

 remnants of the anticline. These hills consist essentially of sand- 

 stone with or without capping of dark trachyte-lava or basalt, 

 and they form in part — i.e., north of Mt. Flinders — the watershed 

 between the tributaries of the Bremer River and those of the 

 Logan River. 



Still further to the south-east we get to the Beaudesert district; 

 here, too, we meet with Coal Measure sandstones, often altered 

 to hard quartzites by doleritic intrusions, and exten.sive areas are 

 capped with basalt-flows. The basalts and dolerites around 

 Beaudesert are covered with rich black soil which was originally 

 partly scrub-land and partly forest. The chief forest-trees on the 

 formation are Eucalyptus tereticornis and E. maculata; on the 

 hills also are E, crebra, E. tnelanophloia, E. heruiphloia and E. 

 tesselaris. 



The geology of this region has, to some extent, been discussed 

 by W. H. Rands in his Report upon the Albert and Logan Dis- 



