Geology.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 699 



It will be seen that this rock-succession is very different from that mentioned 

 by Filhol. The following is an attempt to summarise his statements as to the nature 

 and succession of the lavas : — 



(1.) Andesites with labradorite, but without olivine. The base of Mount Dumas, 

 Mount Honey, and the mass of Mount Lyall. 



(2.) Andesitic basalts, with labradorite, olivine and pyroxene. The terraces 

 of Mounts Dumas, Puiseux, Fizeau, and the upper mass of Mount Honey. 



(3.) Andesitic basalts, with anorthite, olivine, and pyroxene. The small peaks 

 between Mount Dumas and Mount Hone}^. 



(4.) Labradorite basalt. Dykes. 



(5.) Labradorite basalts. Dykes like those at Terror Point. 



Filhol's idea of the source of the volcanic rocks and the points of emission is also 

 altogether different from that outhned above. These are his words : " En jetant 

 les yeux sur la Carte jointe a ce travail on pent voir que les eruptions volcaniques, 

 dont I'ile Campbell a ete le siege, se sont produites en des points excessivement 

 nombreux, et, d'autre part, on pent constater a quel faible degre les formes exte- 

 rieures des divers centres eruptifs ont ete modifiees par le temps. Si je tragais 

 I'histoire de chacun de ces massifs volcaniques resserres les uns contre les autres je 

 serais conduit a repeter constamment et dans le meme ordre des observations iden- 

 tiques." 



It will be remembered that the form of the hills, which was considered of such 

 importance by Filhol in considering their origin that he suggested that they were 

 simple volcanic cones, is here ascribed to the action of denudation. 



The slight slope of the lavas from the west has just been mentioned as a reason 

 for thinking that the point of eruption was westward of the present land. This con- 

 clusion is supported — (1.) By the fact that the converging point of the dykes on the 

 foreshore of Perseverance Harbour is also westward of the inlet, though apparently 

 not far from its margin ; however, the dykes that were examined show no exact 

 point of convergence. (2.) Dykes are more numerous in the limestone cliffs of 

 North-west Bay than elsewhere, and particularly so in its middle portion. (3.) The 

 limestone becomes more and more metamorphic as it is followed westward : this 

 might be ascribed to the action of the gabbro, if it is regarded as younger than the 

 Cainozoic rocks ; but, as previously stated, the horizontal position of the limestone 

 (which does not appear to have been disturbed even where it rests on the gabbro), 

 the decomposed surface of the gabbro, and the absence of any dykes of crystalline 

 rock in its neighbourhood are all facts that tell against the probability of the 

 gabbro being intruded into the rocks which now rest on it. 



Though it cannot be said that the evidence in favour of important structural 

 movements was particularly clear, some information in regard to this was obtained. 



At Camp Cove the limestone dips west at an angle of 15°, though on the west 

 coast it is almost horizontal. In the western part of the bay it becomes somewhat 

 argillaceous, more distinctly laminated, and highly inclined, with a north-and-south 

 strike. It shows exactly the same features near the head of Garden Cove. It is 

 believed by the writer that these mark the position of small faults. In the high 

 western cliffs between St. Col Peak and Mount Azimuth there is, as far as could be 

 seen in the boisterous weather experienced, a sudden change from limestone to 

 breccia, and between the two a vertical intrusion of glassy trachyte, which thus 



