1910-1911.] 



36: 



been noted, and occasional biotite and magnetite. Skirting the 

 base of Carneamey, the drive was continued down Donegore Hill 

 to Parkgate. The conductor pointed out at the base of Carnearney, 

 a very dark red pitchstone, much decomposed, and also a similar 

 rock, but still more weathered on Upper Scolboa. After enjoying 

 tea at Ballyclare, the party returned to Belfast by the 7-45 train. 



CASTLEROCK. 



On Saturday, 21st May, a party of members and friends, 

 numbering 85, visited Castlerock and its vicinity. The party, 

 which was conducted by Messrs. N. H. Foster, M.B.O.U., and 

 W. J. C. Tomlinson, left the Midland Railway Terminus at 9-45 

 in a specially-reserved saloon carriage, and arrived at Castlerock 

 about noon. On arrival the majority of the party elected to visit 

 the demesne of Downhill Castle, while others visited the various 

 collecting grounds in the vicinity. 



Little work of a geological nature was done on this excursion, 

 few of the geological section being present. Apart from the Post- 

 Tertiary and Recent deposits, so conspicuous in the neighbourhood 

 of Castlerock, the geology of the district is limited to two main 

 formations — namely, the Tertiary basalts and the Upper Chalk of 

 the Cretaceous system. 



The Downhill headland is composed of the former. Just 

 west of Downhill Station the Chalk outcrops on the shore, and half- 

 a-mile further west, towards Umbra and Magilligan, it is a 

 conspicuous feature in the escarpment. Large quarries are worked 

 here, and fossils are frequently met with. The basalt of this 

 escarpment is noted for the abundance of zeolitic minerals 

 it contains. 



During the day the botanists of the party were very busy, 

 and reported the following, among other, finds : — Ranunculus 

 trichophyllus, Erophila vulgaris ^ Sisymbrium Thalianum, Cerastium 



