116 Transactions. 
Cretaceous rocks are indicated by a usually unfossiliferous but occasionally 
belemite-bearing grey or blue limestone, which crosses the Purari River ; 
the cherts with Actinacis swmatraensis at the junction of the Fly and 
Palmer Rivers; the fossiliferous sandstones and limestones on Korova 
Creek, near Kerema ; and the ammonites, &c., in the calcareous shale in 
the Kerabi Valley, to which Dr. P. Marshall verbally assigned a Senonian 
age. A single development of Eocene coral is reported from the Fly 
River (Gregory and Trench, 1916). АП these formations are stretched 
along the southern flanks of the great central range, which is essentially 
a horst, or faulted geanticline, consisting of crystalline rocks, the gneisses 
and schists of the Owen Stanley series. These are invaded by ‘granitoid 
(Devonian ?) limestones of the Astrolabe- Kemp Welch series, which are 
invaded by fine-grained basic igneous rocks, and may be in part Palaeo- 
zoic. The cover of Eocene Alveolina limestone which probably extended 
over much of this complex has been almost entirely removed (see the 
generalized sections by Stanley, 1924). The extensive masses of lime- 
Saruvaged Ranges near the Finisterre Ranges to the north. The south- 
eastern extension of this central zone is, as previously indicated, bounded 
to the north by the faulted coast of Huon Gulf. There-is a fringing, 
more or less undulating series of Miocene-Pliocene marine sediments 
resting on the ancient metamorphic rocks of the basement series, which 
are continued into the Louisiade Islands. Mount Victory, the only active 
volcano in Papua, is situated on this fault-line, and has built up the Cape 
Nelson Promontory. 
The north-coast ranges of New Guinea extend north of the above- 
described longitudinal trench. The scattered data concerning them may 
be summarized as follows: In the west the northern Vogelkop Penin- 
age (fide Professor Brouwer). It is, however, difficult to separate these 
from the complex of crystalline schists and phyllites which make up the 
bulk of the peninsula and extend along the coast farther to the east. The 
Van Rees Mountains, as shown by Gelder (1910), consist of undulating 
late Tertiary lignite beds, sandstones, and marls, overlying older Tertiary 
nummulitic limestone, and perhaps Jura-Cretaceous rocks, as shown by the 
occurrence of pebbles containing Perisphinctes and Inoceramus. These are 
reported also at several localities farther to the east; and at Walckenaer 
Bay there are Miocene clays and coal-measures, which dip very steeply, 
while pebbles of various crystalline rocks in the river-beds near the coast 
indicate the presence of the basement series in the ranges they traverse. 
. At Humboldt Bay, near the boundary between the Dutch and the man- 
dated territory, the small island of Misotti is made up of serpentine (Suess, 
1909, p. 306), while Miocene beds occur at Cape Djar on the mainland 
near by (Stanley, 1923). The north-western portion of 'the mandated 
che (1913), and Schultze 
On the southern slopes of the Bewani Ranges, drained by the Sepik River 
system, occurs the crystalline metamorphic series, together with an altered 
