Brnson.—Structural Features of the Margin of Australasia. 117 
group of phyllites, отти and conglomerates, with chloritic and epidotized 
diabases, and porphyrites and keratophyre-tufis invaded by gabbro and 
diorite. The Bonga Range is largely made up of the Oenake 
serpentine massif. Overlying these older rocks there occur fossiliferous 
Jurassic sediments in the headwaters of the Sepik and October Rivers, 
Cretaceous foraminiferal limestones, also older Tertiary (?) glauconitic sand- 
stones and shales invaded by gabbro on the southern slopes of the Bewani 
Range, with nummulitie and lepidocyclinal limestone, which dips south- 
south-east at 10^, on the northern slopes.  Farther east, in the Torricelli 
Mountains, are fossiliferou us sediments which were referred by Richarz to 
the Cretaceous period, but which must be considered Lower Miocene (fide 
Wanner, private communication) on account of the occurrence of Lepido- 
cyclina and other Foraminifera. These dip at 807-85? to the north-north- 
west, a marked local variation from the general strike. These last are 
Monumbo (Potsdamhafen), which dip north-eastwards at 25°-30°, and 
appear to have been invaded by granodiorite, as is again the case in other 
points along the coast (Stanley, 1923, p. 24). These rest on older basalts, 
and overlie unconformably a series of phyllites, &c. (comparable with the 
Astrolabe - Kemp Welch ge. which have been invaded by a large mass 
of pre-Tertiary peridotite. This series of shattered and metamorphosed 
of ancient schists, &c., invaded by basic plutonic rocks forms the founda- 
tion of the Finisterre Range and the Huon Peninsula. It is reported that 
the strike here swings from a south-easterly into a easterly direction, 
though caution must be exercised in deducing the strike of a very dislocated 
series of rocks from the general elongation of the fault-bounded horst in 
which they are exposed. Capping the Saruvaged Range at a height of 
13,000 ft., and forming the highest portion of the peninsula, are the 
extensive faulted masses of white limestone discovered by Detzner (1919) : 
this may be, as Stanley (1921) has suggested, an extension of the 
Alveolina limestone which is so widespread farther to the west. Nearer 
the coast the ancient rocks are covered locally by approximately hori- 
zontal curet sandstone and voleanie agglomerate. Suess notes the 
e of andesites here. 
lisa bout the whole extent of the northern coast of New Guinea 
there are very frequent instances of upraised Pleistocene marine deposits 
and coral reefs. 
Summarizing the stratigraphy of New Guinea as deduced from the avail- 
able data, there must first be recognized an ancient gneissic and schistose 
group of ‘rocks, together with a somewhat younger but highly disturbed 
series of sediments and volcanic rocks, possibly in part Palaeozoic. These 
have been invaded b anites, and especially basic plutonic rocks and 
peridotites. They are succeeded, probably eo by Permian, 
Jurassic, and Cretaceous rocks, the relations of which to one another are 
not yet clear, though there is as yet no evidence of marked orogeny 
хеле the Mesozoic period. Nor, indeed, is there yet any proof of 
mportant crust-folding between the time of deposition of these and that 
of the early Tertiary sediments, littoral sandstones, siliceous radiolarian 
cherts, and the very extensive Eocene Alveolina limestone which covered 
the greater part of the area, though there seems evidence of some minor 
