616 Transactions. 



rocky ridges, by the marked rock-benches which occur in places (Plate LIV, 

 fig. 2) and by the sand- and gravel-bays which represent aggraded sunken 

 stream-mouths (Plate LIV, fig. 1). 



The eastern shore-line resembles the western margin. There are two 

 pronounced indentations — the harbours of Parengarenga and Hohoura. 

 Both are sunken stream-mouths. Parengarenga, with its branching bays, 

 is of very irregular outline. At low tide the greater part of the inlet is bare 

 of water, save for the channels of the numerous streams which ramifv 

 through the mud-flat and unite to flow as a single stream through the narrow 

 entrance. Hohoura Harbour resembles Parengarenga in general character, 

 but is smaller and of simpler outline. 



Drainage. 



The drainage of the Aupouri Peninsula is insequent in t}^e — that is, 

 the streams flov\^ independently of the structuie of the rocks. 



The area is well and maturely dissected. Many of the streams flow 

 practically at grade to their headwaters. 



The principal streams are the Waitiki, Mitimiti, and Te Kao, entering 

 Parengarenga Harbour, and the Werahi and Waitangi, draining into the 

 sea on the northern seaboard. All are short and small, as would be expected 

 from the small area and low relief of the country they drain. 



Geology. 

 Introduction. 



Owing to the inspection of the Aupouri Peninsula being only in the 

 nature of a reconnaissance, we were unable to investigate for ourselves 

 many interesting questions dealt with in the reports of Sir James Hector 

 and Mr. Alexander McKay. In order to present as complete an outline 

 as possible of the geology, the remainder of this paper is partly a compila- 

 tion from these previous reports, but in every case where the conclusions 

 given are not the result of our observations the authority for them is 

 quoted. 



The following provisional names will be applied to the stratigraphical 

 groups recognisable in the area under consideration : Mount Camel Series, 

 Whangakea Series, Rahia Series, Coal Point Series, Older Debris, Newer 

 Debris. 



It has been thought advisable, in consideration of the isolated position 

 of the area and the scanty palseontological data available for comparative 

 purposes, to apply local names to all the series, although in the case of the 

 Coal Point Series identity with beds developed elsewhere is proved. 



Mount Camel Series. 

 Mount Camel and the low hills to the north-west are composed, accord- 

 ing to McKay,* of rocks which bear a close resemblance to the supposedly 

 Palaeozoic rocks occupying the greater part of the coast-line between Wha- 

 ngaroa and Mangonui. Hectorf describes them as a " development of 

 diorites and tufaceous sandstones with mineral impregnations " similar 

 to the series found in several localities further south, and notably in the 

 Puhipuhi area. Where rocks of the series were seen by the writers at the 

 head of Hohoura Harbour, they consist apparently of argillites and grau- 



* Rep. G.S., 1894, p. 72. 

 t Rep. G.S., 1892, p. ixxxi. 



