igoi. The Bfitish Association in Belfast. 297 



rocks were examined, and their effects on the sediment noted. 

 It was observed that many of these dykes contain fragments 

 of a coarsely crystalline rock rather like the eucrite of Slieve 

 Foye. These patches might be regarded either as segrega- 

 tions or as portions of a plutonic mass torn off and carried 

 upwards by the basalt dykes. In this latter case the basalts 

 would be late Tertiary in age. A walk brought the party to a 

 large gabbro or dolerite quarry on the flanks of Barnavave, 

 where the conductor gave an account of the geology of the 

 district. Attention was directed to the garnet-woUastonite 

 rock originally discovered by the conductor. The rock has 

 been formed from the Carboniferous limestone by contact 

 action with the gabbro, which has completely enclosed blocks 

 of the limestone and converted it into a rock composed of 

 lime' silicates of at least five or six varieties. These include 

 two garnets, wollastonite, idocrase, pyroxenes, and some 

 others. Fluorite is also present. Proceeding up the slopes of 

 Barnavave the penetration of the acid granophyre into the 

 gabbro was clearly seen. On the way to Slieve Foj^e the 

 fluxion or banded structure in the eucrite was pointed out as 

 occurring locally. On the waj' down an exposure of the 

 typical granophyre was visited and specimens obtained. At 

 Carlingford cars met the party, who then drove on to Omeath, 

 and left Warrenpoint by the 7.0 p.m. train for Belfast. 



Monday, September 15. 



CuLTRA. — Leader — A. M 'Henry. Owing to heavy rains a 

 small party attended this excursion. The adventurous five 

 who braved the elements studied the outcrops of Triassic, 

 Permian, and Carboniferous rocks to be seen on the shore, and 

 returned well soaked but happy. 



Carrickfergus Salt Mines. — As the time allowed of only 

 two and a half hours between leaving and returning to 

 Carrickfergus station, this excursion was limited to some fifty 

 persons. Many more applied for tickets, but the cages or 

 "skips" at the Duncrue mine were well occupied in lowering 

 the number w^ho attended. The greatest credit is due to the 

 manager of the mine for so admirably illuminating the vast 

 chambers excavated in the salt-bed 900 feet below the pit's 



