, 
118 Transactions. 
unconformities between the successive members of this series. During 
Oligocene-Miocene times, however, strong movement occurred at several 
points along the north coast, accompanied by the intrusion of granodioritic 
rocks, and the general direction of superficial thrust of the older Tertiary 
beds appears to have been northward along the north coast, but south- 
volcanic agglomerates and andesite, these later Tertiary formations occurring 
on both sides of the axis. Extensive block-faulting and warping occurred 
of the later Tertiary rocks. The post-Tertiary movements were, however, 
particularly great. The central ranges were elevated as a vast concourse 
of earth-blocks, with huge scarps, such as that of Mount Suckling, in 
eastern New Guinea, which faces to the north and is 8,000 ft. high, or 
the southward-facing scarps of Mount Leonard Darwin and Carstenz Top, 
in the Snow Mountains, which are estimated to be over 10,000 ft. high— 
“the most stupendous precipice anywhere in the world" (David, 1914). 
The lesser displacements near the coast have raised Pleistocene reefs to 
a height of 2,500 ft. 
Preliminary accounts of the course of the structural or trend lines 
intermediate and inner branches consist of the D’Entrecasteaux an 
Louisiade Islands respectively. In all three branches are ancient schists, 
