5 ° 
(4) At the north end of the section is a massive white coralline 
limestone, separated by a fault (/) from 3. The limestones of Delena 
are crowded on their weathered surfaces with organic remains, corals 
being, as a rule, conspicuous by their comparative rarity. This sec- 
tion is of importance, as showing that in post-Pliocene times earth 
movements of considerable intensity took place, which possibly formed 
part of that which resulted in the elevation of the lofty range which 
forms the backbone of New Guinea. 
The Maiva District, south-east of Cape Possession, which I had 
an opportunity of examining, also contains representatives of the Port 
Moresby Beds. Beneath the Kevori grits a coralline limestone, pass- 
ing into a fossiliferous marl, emerges. Frcm the appearance and 
position of the Maiva limestones, I incline to the belief that they are 
identical with those of Delena. 
“ The collection of the Queensland Geological Survey has been 
enriched by the presentation by Mr. E. Edefeldt of specimens of 
brown or yellow marl from Maiva Village, found at a height of about 
200 feet above sea level. The marl has plentifully scattered through it 
the remains of small shells in the form of internal casts, and a few 
fragmentary corals.”! Among the Maiva collection, species of the 
corals Alveopora , Leptona , Galaxea and Deltocyathus were recognised. 
The collection, however, was of “ too limited a nature to permit any 
definite statement to be made as to the age of the beds ; but they are 
either younger Miocene or Pliocene, probably the latter.”! 
3. Boioro Limestones. — The Boioro limestones are best ex- 
posed in that headland in Launoka Doudou (Mayri Bay), from which 
the beds are named. At Boioro, the limestones are of a dull leaden- 
grey color, and are seamed with veinlets of carbonate of lime ; the 
weathered surfaces present a curious brecciated aspect difficult to 
describe. The bedding planes, marked by lines of brecciated frag- 
ments are inclined to the north-west at angles varying from 30 to 45 
degrees. A vertical dyke of dolerite was seen to penetrate the lime- 
stones in the precipitous cliffs of Boioro. Eastwards from Boioro, as 
far as Nobanoka Bay (Port Glasgow), the country was found to be 
occupied by similar beds of limestone. The Boioro limestones yielded 
no fossils to me. Similar limestones were found at Rogea (Heath) Island, 
and on the mainland north of Samari in the vicinity of Waiera Creek. 
The Rogea limestones are arranged in thin beds in a small synclinal 
trough. The limestones of the mainland are identical in every way 
with those of Rogea. In neither place did they yield any organic 
tR. Etheridge, Junr., Our Present Knowledge of the Palaeontology of New Guinea. 
Records Geol. Sur. New South Wales, Vol. I., part 3, pp. 177. 
+Loc. Cit., p. 178. 
