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



long since. The Greensand period was characterized by a rich 

 fauna, and the rocks of that age in Colin Glen yield an extensive 

 suite of fossils, consisting mainly of bivalve shells, echinoderms, 

 and fish teeth. A considerable thickness of white limestone suc- 

 ceeds the Greensand, and represents the Upper Cretaceous period, 

 being correlated with the very highest portion of the Chalk of the 

 Continent. The whole of this extensive series of rocks is covered 

 by the capping of basalt usual in this district ; and the denudation 

 by which they have been here exposed has not only prepared a 

 scene of beauty for the lover of the picturesque, but also a de- 

 lightful retreat where the geologist may pursue his favourite studies 

 with unusual advantages. A considerable number of fossils were 

 collected by the members of the party, amongst which the follow- 

 ing may be mentioned from the Liassic beds : — Vertebrae of Ich- 

 thyosaurus, Cardinia Listeri, C. ova/is, Astarte Gueuxii, Lima 

 gigantea, L. punctata, L. Terquemi, Cardium Rhczticum, Ammonites 

 Johnstoniy and Fucoidea sp. The various Greensand rocks yielded 

 the following species : — Pccten quinquecostata, P. cequicostata, Exo- 

 gyraplicata, E. Iczvigata, Cucullcza Ligeriensis, Spondylus spinosus, 

 Pleurotomaria sp., Tercbratula abrupta, Echinoconus conicus, Ventri- 

 culites sp., &*c. Some few of the members remained at the upper 

 portion of the glen to continue their geological investigations, but 

 the larger portion of the party descended to the Upper Falls Road, 

 whither the cars had proceeded to await their arrival. Once more 

 seated upon them, the route was taken to Castle Robin, and on 

 the way a magnificent view of the valley of the Lagan was ob- 

 tained from the slope of the hill along which the road passes. A 

 short stay was made at the castle to inspect the ruin and the an- 

 cient fort or rath which adjoins it. The castle, which does not 

 appear to have been of any magnitude, is said to have been 

 erected in Elizabeth's reign by Roger Norton, an officer in Essex's 

 army. The fort is said to have been previously known as Lis- 

 ne-Robin, from which name that of the castle may have been 

 derived. The homeward journey was then commenced, and on 



