£i8 9 5-96.]< 305 



both postulate the occurrence of marine fossils. Modern glacial 

 geology devotes itself steadily to the distribution of the erratics 

 contained in the clays. Alec. G. Wilson has further extended 

 the range of erratics of riebeckite eurite so familiar to the Club 

 as " Ailsa Craig rock," as far westward as Kenbane Head and 

 White Park Bay, as well as in the gravels of Ballylesson, and 

 by J. O. Campbell, to the flanks of the Spinkwee Mountains. 

 Amongst 71 unknown erratics submitted to A. M'Henry, 

 m.r.i.a., Geological Survey, Ireland, for identification, 16 were 

 Scotch, whilst 31 others were noted as being either Scotch or 

 Irish. Analysing the list more fully gives 3 diorites, 2 felsites, 

 and 5 other rocks from the Clyde area ; 2 grits from Cantyre, 

 a breccia from Cantyre or Arran, the Girvan area con- 

 tributing two Silurian rocks (one containing a Trilobite and 

 other fossils), and a pegmatite vein rock. 6 of these Scotch 

 erratics were found at Ballyholme Bay, one at NeilPs Hill, one 

 on the shore at Donaghadee, another occurs as a large boulder 

 on the Down coast, north of Glasdrumman Port. In County 

 Antrim, one was found on the shore of Islandmagee, 4 in a brick- 

 field on the Limestone Road, Belfast, and one in those at 

 Wood vale and Oldpark. Such interesting results show what 

 can be done by the section literally at their doors, Robert Bell 

 having specially studied the brickfields of Belfast. The Section 

 will note that these were unfamiliar rocks, numerous records 

 having been made of other well-known Irish rocks. These 

 records are, as usual, tabulated in the schedule prepared for the 

 purpose by the Section and preserved for future reference. 



A list of the larger erratic boulders is given below : — 



XII. — BANGOR AND BALLYHOLME. 



(Continued from last year's report.) 



Boulder clay at sea level. 100 boulders gave 45 erratics, 

 several from Scotland, some Irish or Scotch, some from Down 

 and Antrim. 



