182 Dr. Berger on the Geological Features 



The pillars are composed of the most compact and homogeneous 

 variety of basalt, containing a small quantity of steatite occasionally 

 imbedded in its mass, and possessing the property of being more or 

 less sonorous when struck by the hammer. 



Besides the well known columnar strata exhibited by the Giant's ' 

 Causeway and adjoining cliffs, of which the principal is 54 feet in 

 thickness, and a second 44 feet, similar strata are exhibited in the 

 following places. 



In Glen Ravel, at the distance of about four miles from Cushen- 

 dall, I observed in the bed of a stream flowing from the mountain 

 of Slleveance, an abrupt fa9ade of tabular basalt, approaching the 

 columnar form, fronting the north-east quarter. 



In the isle of Rathlin, there are several systems of pillars along 

 the northern coast : at Kenrammcr, " the thick Head," I counted 

 no less than seven in succession all nearly vertical, but none very 

 regular ; some were matted amongst themselves. 



At Thivigh, " the side-point," there is a sort of headland sloping 

 down into the sea ; it is covered with grass, but the section side- 

 ways exhibits two assemblages of square pillars, not unlike those 

 of Fair-head j the lower system comprehends those of the greatest 

 dimensions ; the upper one, those that are the best defined. 



Rhue-na-Scarse or Roanscarave, in the town-land of Craigmacagan, 

 presents another projecting point of land, with a real causeway, in 

 neatness hardly inferior to the Giant's causeway itself, the pillars 

 being almost vertical ; the pavement is nearly flat or horizontal. 



At Doon-point, tabular basalt alone occurs ; whence it appears 

 that the late Dr. Hamilton has misLiken it either for Thivigh or 

 Rhua-na-Scarse. 



Near Ushet-haven, on the south-east side of a hill, named in 

 Irish Broagh-mor-na-Hoosid, there is another very elegant causeway: 



