MEETINGS. 149 



gneiss may be seen in the Waterway. The gneiss appears 

 altered and blended with the diorite by fusion. The same 

 rocks may be seen in similar relation to each other at the foot 

 of the hill on which the tower called " Le Griffon," serving 

 as a look-out, is erected, and here the granite may also be 

 seen to intrude and contain inclusions both of diorite and 

 gneiss. The intrusion of the granite may have been the 

 cause of the blending and alteration of the diorite and gneiss. 

 The same relations of the rocks may be also observed in the 

 gravel pits close by, but the rock in these pits is so disin- 

 tegrated that it is often difficult to distinguish the granite 

 from the gneiss. 



5. — UEree Peninsula 



Is an outcrop of porphyritic gneiss with intrusive dykes of 

 coarsely crystallized quartz felsite. Amorphous diorite dykes 

 are not so numerous as in many other parts of the island, but 

 a broad one occurs near the northern extremity. Inclusions 

 of porphyritic diorite occur in the gneiss similar to those 

 found at Richmond, and recalling those in the Vale granites, 

 but more lenticular in form, as though deformed by pressure, 

 without, however, any foliation. These inclusions afford an 

 argument in favor of the igneous origin of the gneiss, and 

 indicate the greater age of the diorite which may be related 

 to the rock termed hornblende gabbro by Rev. Hill. The 

 non-foliation of the inclusions may be due to subsequent 

 recrystallization. 



6. — Cliffs ivest of Les Thielles, 



In the report for 1894 (page 329) allusion is made to the 

 two kinds of gneiss found in this neighbourhood, viz., the 

 syenitic on the west, and the porphyritic on the east. The 

 junction of these may be seen at the foot of the cliff, but is 

 rather difficult of access. It appears to be a fault accompanied 

 by reconsolidated crushed rock and by a quartz felsite and 

 several diorite veins, the whole forming a complicated section 

 which will repay further examination. The porphyritic gneiss 

 to the East of this junction is much altered and, as already 

 noticed in the report for 1894, is blended with the diorite 

 veins sometimes forming a rock resembling hornstone. As 

 the distinction between the two kinds of gneiss can be traced 

 across the island to the east side of Richmond peninsula, it is 

 probable that the separating fault extends the whole distance. 

 The rock on one side of this fault contrasts strongly with that 

 on the other, but veins of the porphyritic variety occur in the 



