272 



[Proc. B.N.F.C., 



derived no inconsiderable proportion of their constituents from 

 rocks of rhyolitic type and composition points to the conclusion 

 that the rhyolites are of Tertiary age, and that their lavas were 

 poured forth in the period between the outflow of the Lower and 

 the Upper Basalts. The same facts warrant the inference that 

 lavas of rhyolitic type were ejected on a grander scale in the 

 district than the existing isolated patches and bosses of the rock 

 seem to imply. Many beautiful specimens were collected by the 

 geologists at Cloughwater on Saturday, and at all the places visited 

 a number of photographic geological records were made. 



ORLOCK POINT. 



Members and visitors to the number of forty-one took part in 

 the seventh and last excursion of the season on 28th August, to 

 Orlock Point, a picturesque and wild bit of coast between Grooms- 

 port and Donaghadee, taking in also a visit to Portavoe Demesne, 

 the ancient seat of the Ker family. The party, under the con- 

 ductorship of the Vice-President, Mr. W. H. Gallway, travelled 

 down to Bangor by the 1-55 train in specially reserved carriages. 

 On reaching Bangor, Mr. H. Morrow had brakes in waiting, 

 which were quickly mounted, and the drive commenced through 

 Ballyholme and Groomsport until the Orlock Hill was reached. 

 Here the party dismounted, and, making their way down to 

 the shore, examined the sandhills to the north of Balloo Bay. 

 Leaving here and passing along the road cut through the Silurian 

 shale, the party came to a halt at the foot of the buildings formerly 

 used as a coastguard station. Time being allowed for a brief 

 examination of the district, the members separated, some to study 

 the geology of the Point and to search the bed of black shale 

 occurring here for graptolites ; others examined the numerous 

 rock-pools for marine life, while the botanists were fully engaged 

 with the shore-loving plants, and wandering further afield for 

 other rarities. 



