PRESIDENTIAL ADDRESS. 51 



thinks, as the result of a personal examination of the beds, 

 that the pressure came from the north. Dr. Lorentz 1 has 

 referred to limestones discovered by himself in the Wilhel- 

 mina Range as of Cretaceous Age. He calls them Alveo- 

 lina limstones. They have been uplifted to over 14,000 

 feet above sea level. 



A good account of the geological structure of German 

 New Guinea is given by P. Steph. Richarz. 2 A further 

 account is given by P. Reiber. 3 He gives a section of the 

 Cretaceous rocks of the Torricelligebirge. These dip N.N.W. 

 at 80 - 85°. Richartz considers that the Upper Cretaceous 

 rocks participated in the folding. Beneath the Cretaceous 

 rocks are crystalline schists. In the Ortzengebirge west 

 of the Finisterregebirge, these strike N.W. and S.E. dipping 

 at 70-80°, and above the Port Moresby beds are newer 

 sediments, including recently raised reef, ranging up to 2000 

 feet above sea-level. The Mt.Victory volcano is still active. 

 Thus in New Guinea we see Pre-Cretaceous schistose rocks 

 with N.W. to S.E. trends. These are followed by much 

 folded and greatly elevated Cretaceous rocks, the W.N.W. 

 and E.S.E. directions predominating. These in turn have 

 been succeeded by the Tertiary Port Moresby Beds which 

 have been violently disturbed and uplifted in Post-Eocene, 

 possibly Post-Miocene time. In this later series some 

 northerly to north-westerly lines cross the older lines of 

 folding in the schists and Cretaceous rocks. 



Summary of the Tectonic Movements. 

 In the present imperfect state of our knowledge, the 

 sequence of events in the building of Australia may be 

 briefly outlined as follows : — 



1 Geogr. Jour., Vol. xxxvn, 1910, p. 496. 



2 Neues Jahr. fur Min. G-eol. u. Pal., xxix, Beilage Band, Zweites Heft 

 Stuttgart 1910. Der geologische Bau von Kaiser Wilhelm's Land nach 

 dem heuteren Stand unseres Wissens. 



3 Ibid., xxix Band, Zweites Heft 1911. 



