88 Transactions. 
At Cape Rodney, on the east coast of North Auckland, the fossiliferous 
breccias at the base of the Waitemata series of Oamaruian age rest on 
the uneven surface of a jagged ridge of Trio-Jurassic argillites and grey- 
wacke. 
Farther south, at the west end of Motutapu Island* in the Waite- 
mata Harbour, marine erosion has exposed a good section of the basement 
beds of the same Cainozoic formation abutting against and overlapping 
the Trio-Jurassic rocks which rise up somewhat abruptly above sea-level, 
forming a ridge that runs to the eastward. As the lowermost beds of . 
the younger series are not uncovered, it is impossible to say how far they 
overlap the uneven bed-rock оп: which they rest; but the character of 
the material tends to show that no great thickness of strata exists below 
the breccia exposed on the beach. 
At Puketawai, lying six miles east of Te Kuiti, a ridge of Middle 
Mesozoic rocks rises up through the Oamaruian coal-measures, thereby 
interrupting the continuity of the coal. Though the actual contact is mot 
seen, boreholes have shown that the sides of the ridge are steep. Other 
outcrops of the bed-rock occur to the north and west, a circumstance which 
seems to show that the coal-measures in this area were deposited on a 
terrain dissected in the early Cainozoic into hollows and ridges. The 
floor of the same coal-measures at the old Taupiri workings as exposed 
along the outcrop is not rugged but gently undulating. 
On the Mount Arthur tableland, Nelson, the Oamaruian formation 
is represented by a thin bed of gravelly conglomerate overlain directly 
by a horizontal sheet of hard limestone. ere the conglomerate rests on 
a fairly even peneplained surface of Palaeozoic rock. 
Near Stony Creek, in the Takaka Valley, the same Cainozoic limestone 
lies directly on a remarkably even platform of Ordovician crystalline 
lüimestone.f То the north of this, in the Aorere Valley, isolated blocks of 
the Oamaruian limestone are underlain by quartz sands which rest on a 
peneplained surface of Palaeozoic slaty argillite. 
In the upper part of Big Hill Creek, to the west of Big Hill, in the 
Awamoko Survey District, Oamaru, a sharp pinnacle of phyllite projects 
into the quartz sands of the Ngaparan lignitie series.t In the same area 
І recently discovered an isolated ridge of russet-brown semi:metamorphic 
Kakanuian schist projecting into the quartz sands of the lignitic series 
at a place a mile from Ngapara, close to the sand-pit facing the main 
road and railway to Oamaru. The outcrop begins at the south-east 
corner of Section 14a, and passes into Section 15a of Block VII for a 
distance of 50 yards or more. It rises into the sands to a height of 40 ft. 
It was noted that the strike of the Palaeozoic rock is N.W—S.E., and the 
dip, though this is somewhat obscure, to the south-east at high angles. 
The slope of the schist-ridge on the side presented towards Ngapara is 
steep. To the eastward the slope is gentle. The sands wrap around and 
ride over the ancient ridge, rising above it to a height of 180 ft. 
At Port Craig, south of Mussel Beach, on the south-west side of 
Waewae Bay, Southland, the breccias, conglomerates, and limestones 
at the base of the Oamaruian are seen resting on a deeply eroded and 
uneven floor of diorite.§ 
* J. PARK, Rep. Geol. Explor. — 1886-87, No. 18, 22 : 
à ; Vo. 18, p. 225, 1887. 
TJ. Park, Rep. Geol. Explor. during 1888-89, No. 20, p. 226, 1890. 
tJ. Ракк, N.Z. Geol. Surv. Bull. No. 20 (n.s.), р. 21, і 
$ J. Park, The Geo and Mineral ree 
: Ў ‚ logy 
Geol.. Surv. Bull. No. 23 (n.s.), p. 51, 1921. 
s of South-west Southland, N.Z. 
