IRON 



025 



cretionary pisolitic structure, interstratified iu tho great mass of basalt covering the 

 whole of the county of Antrim north of Belfast. 



Passing east from Slievananee, the iron-beds are worked from the face of the 

 basaltic escarpment overhanging Milltown, Red Bay, at tho entrance of Glenariff 

 Glen. The beds dip west about 5, and are about 200 feet above the upper limit 

 of the White Limestone. Further to the east the iron-band has been traced to near 

 Garron Point. Two miles to the west of Carnlough the ferruginous series is seen at 

 a height of 600 feet above the sea-level, dipping at an angle of about 40 E. magnetic. 

 Tho matrix of the pisolitic ore, 22 inches in thickness, is of a bright vermilion-red 

 colour, becoming browner as it passes downward ; it then passes into a friable 

 yellowish ochre, 4 feet thick, which, in its turn, graduates into a blue lithomarge 35 

 feet thick. Overlying the pisolitic ore is a semi-prismatic basalt, the columns of 

 which are perpendicular, and consequently include with the underlying strata an angle 

 of 50. 



Other outcrops are worked at Ballyvaddy and Tully, near Glenarm, and at Ante- 

 ville, Kilwaughter, and Shane's Hill, near Larne. 



The following Table of analyses of the pisolite ores of Antrim is from Messrs. Tate 

 and Holden's paper, published in the ' Quarterly Journal of tho Geolpgical, Society ' : 



LitJiomarge is an aluminous mineral found in Ireland, with the Antrim ore. 





