146 Transactions. 
The conglomerates are exposed near Riverhead Wharf in several places. 
Alongside the road to Albany, about a mile and a half north-eastwards of 
Riverhead, outcrops are visible in the beds of two small streams crossing 
the road, and immediately north of the more easterly of these last outcrops 
there is a thin band showing on the banks of Rangitopuni Stream at the 
uppermost limit of tide-waters. Farther north-east in the same stream, 
and in a cutting adjacent to the stream near where the road to Serjeant’s 
crosses by bridge to the right bank, a heavy conglomerate at least 40 ft. 
in depth has prominent outcrop. Eastwards from Riverhead similar beds 
appear in Paremoremo Creek and at the roadside a little north-west of. 
that stream. This band possibly is continuous in a north-easterly direction, 
reappearing as a strong stratum which outcrops near the lower wharf at 
Albany, on Lucas Creek, and from there for nearly two miles is traceable 
onwards by means of boulders shed by it. à 
North of Riverhead several bands outcrop in an area around Red Hill, 
and there is an exposure of similar conglomerate on one of the gum-tracks 
leading from the Riverhead-Helensville Road about two miles south-west 
from Red Hill Some of these -bands are only a few feet in depth, but 
others exceed 60 ft. In most of the branches of Gibbs Creek north-east 
of Red Hill the conglomerate is again found, but it is poorly developed 
beyond the areas already mentioned, until the Ararimu Stream is reached, 
where an extensive outcrop occurs. It can be traced northwards to The 
Peaks in divides west of Ararimu Stream, and was examined in situ in 
several small streams draining west to Kokopu Stream. 
It is reported that there is an outcrop of conglomerate at Horseshoe 
Bush, but the writer did not locate it. 
Continuing north, there is no sign of conglomerate until near the 
Kaukapakapa-Parakakau Road, where it outcrops in unmistakable fashion, 
probably covering nearly all the area between its mapped extent at Wainui 
Hill and its southern outlying outcrops adjacent to the Kaukapakapa- 
Parakakau Road. This is by far the most important development of the 
conglomerate, and its thickness, including minor beds of sandstone, cannot 
be much less than 700 ft. 
About a quarter of a mile north of Makarau Railway-station a thin bed, 
less than 1 ft. in depth, with small dioritic and other pebbles, appears on 
the right bank of Makarau Stream in the massive sandstones typical of the 
Waitemata series as developed in that district. It serves as an indication 
that others of similar character are to be expected throughout such 
beds. 
Whilst it is impossible to gain any accurate information on the sub- 
ject, the facts indicate that the beds of conglomerate throughout the 
Kaukapakapa-Riverhead district are discontinuous and essentially lensoid 
innature. Thin bands are probably of common occurrence, for characteristic 
boulders are to be found over wide areas other than these where definite 
outcrops are obtainable. 
Relations to Associated Series. 
The evidence of certain pebbles enclosed in conglomerates of the 
Waitemata series has already been shown to suggest widespread erosion of 
the Onerahi beds during Waitemata sedimentation. Onerahi strata do not 
outcrop in the mid-Auckland district south of the area which they have been 
shown to occupy at Dairy Flat, and the Waitemata beds rest, wherever 
the contacts are visible, upon a surface of Trias-Jura sediments. 8 
