MEETINGS. 23 



The intrusive veins of amorphous diorite or talvane are 

 very numerous, and on the whole run parallel to the lamination, 

 but with numerous discordances arising from irregularities in 

 their courses. These veins occasionally contain inclusions of 

 gneiss. An instructive example of the relations between 

 gneiss and diorite of the St. Sampson's type (not to be con- 

 founded with the talvane veins above referred to) can be seen 

 in the cove south of the priory ruins. The diorite here occurs 

 as a boss which blends with the gneiss on one side, but is 

 penetrated by numerous granitoid veins which seem connected 

 with and derived from the gneiss on the other side. The 

 relations of the rocks in this locality are similar to but not so 

 complicated as those observed at the Bathing Places, Fort 

 Bay and the north horn of Fermain Bay. 



3. — Granite Veins in Syenite at Pulias and Portinfer. 



Many granite veins occur in syenite in these localities. 

 Some are seen in section presenting round or oval spots two or 

 three inches in diameter, which at first sight resemble inclu- 

 sions. The granite is pink, and there is not the slightest 

 blending between it and the syenite, but rather a tendency to 

 separate at the junction. 



4. — Granite intrusive in Diorite in the neighbourhood of Vale 



Church, 



The large quarry north of Vale Church is worked in a 

 boss of diorite, but the west side of the quarry and the rocks 

 on the adjoining beach consist chiefly of a coarse syenitic 

 granite which is intrusive in the diorite and contains numerous 

 inclusions of the same. This syenitic granite does not re- 

 semble the Cobo granite, and is probably more ancient, as 

 talvane veins occur in it. 



5. — Felsite Veins and Mica Trap Vein at VEree, 



Three veins of felsite cross the porphyritic gneiss south 

 of l'Eree promontory in a N.N.W.-S.S.E. direction. The 

 principal vein was traced 120 yards. It is intersected by 

 several faults, one of which displaces it horizontally by about 

 six feet. 



These veins are cut by a mica trap vein. The direction 

 of the latter is N.E.-S.W. ; its dip 65° S.E. The gneiss near 

 this vein is altered and disturbed. 



C. Gr. De La Mare, Sec. Geo. Sect. 



