BY H. I. JENSEN. 103 



D'Aguilar and Blackall Ranges can be satisfactorily explained. 

 The dips might have been accentuated by a further uplift of the 

 old mountain area Thus a new coastal range was formed to the 

 east of, and parallel to, the old one. The folding movement 

 this time came from the east. 



(b). Faulting. — The entire area studied has been subjected 

 to very considerable faulting. The most faulted portion is 

 probably the Maroochy district. 



The probable fault at Big Hill on the Caboolture- Woodford 

 road is quite a feature in the district, and the steep granitic slopes 

 have not yet had time to be greatly dissected by the head waters 

 of the Wararba Creek This fault runs approximately N. W.-S.E. 

 The downthrow is to the N.E. The sandstones on the downthrow 

 side have a sharp dip (25° up to 70°) to the N.E., induced pro- 

 bably by the drag, and have mica developed in them. 



A curious rock resembling a fault-breccia was located between 

 Mt. Eerwah and the Bottle and Glass, where the remarkable 

 mountain gaps alone suggest a very considerable fault. The 

 fault here probably runs from E.S.E. to W.N.W., and the down- 

 throw would be to the E.N.E. 



The steep western slopes of the Woondum tableland appear to 

 be due to another great fault. 



A. small fault at the Eumundi Railway Station has already been 

 referred to. 



Most of the faulting of the area under discussion took place 

 in Tertiary times and therefore still leaves its impress on the 

 physical geography. 



In the environs of Buderim Mountain there has been great 

 faulting, probably simultaneous with the basaltic eruptions. 



iv. Tertiary Changes op Sea-level. 



As has already been shown, the district was elevated above 

 sea-level by an expansion of Trias-Jura sediments in Creta- 

 ceous times. Considerable dissection of the elevated portion 

 followed, in the north especially, and subsequently lavas were 

 poured out. At the same time a monoclinal fold produced the 



