686 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



[Geology. 



Fig. 2. — The Western Cliffs of Limestone, Campbell Island. 



at the same distance 

 away in the south. On 

 the west a section is ex- 

 posed which shows the 

 relation of the gabbro 

 to the sedimentary beds 

 which rest on it. The 

 junction appeared to be 

 unconformable, though 

 heavy rain and a bois- 

 terous wind prevented 

 a close inspection from 

 being made on the steep 

 cliff. In this section the 

 sandstones rest almost 

 horizontally on the un- 

 even surface of the gab- 

 bro. Similar sandstones 

 are exposed on the west- 

 ern shore at the end of 



Perseverance Harbour, where they are found to consist of quartz grains only 



slightly cemented together by limonite. Sometimes the quartz pebbles attain the 



dimensions of stones 3 in. or 4 in. in 



diameter. The sandstones are exposed 



to a thickness of 10 ft. ; they become 



finer towards the top, and change into 



shales, sometimes carbonaceous, 50 ft. 



thick. Limestones rest conformably 



on the shales, and attain a thickness 



of perhaps 500 ft. in the exposure in 



North-west Bay. 



The quartz is derived from schist, 



but no exposure of this rock was found, 



though Filhol mentions it as occurring 



in two places, and in each of these a 



careful search was made. In the 



localities named by him the limestone 



was found to be argillaceous and lami- 

 nated, and the laminae were highly 



inclined. The rounded pebbles of 



quartz may, at any rate, be taken as a 



proof that an area of schistose rock 



existed close at hand at the time of 



their deposition in the conglomerate. 

 Beds of volcanic tuff rest on the 



limestone apparently unconformably. 



No clear section of their contact could 



be seen, though one could probably be 



Ficx. 



3. —Cliffs of Mabble near the Western Side of 

 North-west Bay, Campbell Island. 



