124 [ Proc - B.M.F.C., 



cent, being basalt, frequently rotten, as compared with 42 per 

 cent, in B. and D. No shells were found, but the bed yielded 

 2 species of Foraminifera. A redeposited Belemnite from the 

 chalk of Antrimfwas found. 



Erratics: — Silurian grits and slates, vein quartz, grits with 

 veins of a carb. and oxide of iron, Tertiary dykes, and granite 

 or granophyre, Mourne district, Co. Down. Sheared igneous 

 rocks from metamorphic of Co. Antrim, N.W., or Tyrone, W. 

 Mica schist, metamorphic of Co. Antrim, N.W. Quartzites 

 (one with amethyst) metamorphic of Co. Antrim, N.W., 

 Derry, N.W., or Tyrone, W. Chalk, polished and consider- 

 ably r., 33 x 27 x 15 and smaller fragments, Co. Antrim, N.W. 

 Basalt scored, smoothed, sub., 33 x 21 x 12, ditto 32 x 22 x 15, 

 ditto 20 x 10 x 13 and smaller fragments, Co. Antrim, N.W. 

 Eurite with Riebeckite, from 7^ x 5 x 3^, sub., down to an 

 inch, Ailsa Craig, N.E. 



LARGE ERRATIC BOULDERS. 



Photographs, measurements, or calculations as to weight of 

 many large isolated erratics have been contributed by R. J. 

 Welch. 



f. The "Rocking Stone," Brown's Bay, near Larne. 

 Boulder of basalt with characteristic rudely spheroidal structure, 

 developed by weathering, perched on the edge of a rocky ledge, 

 many feet above sea level. 



2. Cloughmore, Rostrevor, Co. Down, Mourne granite, 

 resting on Lower Silurian slate 970 feet above sea level. 



3. The " Butterlump," basalt, weighing over 133 tons, 

 20 x 15 x 15 feet, resting on New Red Sandstone on the shore 

 of Strangford Lough, Co. Down. 



4. An erratic of basalt, weighing over 500 tons, resting on 

 Lower Silurian slates on the shore of Strangford Lough, near 

 Greyabbey, Co. Down. 



5. An erratic of basalt, the Capstone of Ballymascanlan 

 Cromleac, Dundalk, Co. Louth, 10 ft. 4 in. x 4 ft. 6 in. x 2 ft., 

 weighing 46 tons. 



