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



400 feet. It was also found at Limavady and Kilrea. The records 

 from Moys and Limavady show a marked westerly advance, 

 -Coleraine and Portstewart having been the previous limits in this 

 direction. It was recorded by Mr. Bell for the first time at 

 Aghalee, three miles east of Lough Neagh, and from Drumaneway, 

 two miles west of Randalstown. Dervock is also a new 

 locality, but notwithstanding its occurrence there it was not 

 found in any of the small gravel-pits near Ballymoney. Another 

 valuable record is the discovery of Ailsa rock by Mr. Bell, last 

 September, on the White Mountain, north of Lisburn, at a height 

 of 800 feet, the highest level from which he has hitherto obtained 

 it. From the localities already enumerated other interesting 

 erratics were obtained, and collections were also made from 

 Aghadowey, Garvagh, Derrybeg, Carmean near Moneymore, 

 Cookstown, Glasgow Hill (esker one mile north of Cookstown), 

 Blue Door (gravel-pit near Cookstown), Sherrygroom, Coalisland, 

 and Cullion Glen, N. Slieve Gallion. Red and pink granites were 

 much in evidence, and with them there was a large admixture of 

 other erratics such as diorites, epidiorites, syenites, schists, &c. 



By kind permission of the Director, a large number of erratics 

 were forwarded to the Geological Survey Office, Dublin, and were 

 determined by Mr. J. R. Kilroe. The probable origins of the 

 erratics in the annexed lists are largely given from these determin- 

 ations. They show that many erratics have a probable southern 

 source, confirmatory of the Field Club's earlier observations. It 

 will be remembered that in Madame Christen's " Summary of 

 recent Glacial Investigations" (Appendix VII. of Vol. II. 

 Proceedings of the Belfast Naturalists' Field Club for 1905-6, 

 p. 329), she refers to having been frequently assured that we 

 should never find erratics north of their place of origin. "Our 

 experience," she writes, " does not at all bear out this assertion, 

 which postulates a simple southward ice-flow, and omits to reckon 

 with radiating local systems of glaciation that may have persisted 

 over high ground prior to, and long after, the great central plain 



