I04 



Guide to Belfast. 



sheet. At Ballygally Head the great height of the rude 

 columns known as " cornsacks " indicates a considerable 

 thickness or depth in the sheet, and the coarse texture 

 of the rock accompanying this proves how variable in 

 thickness were the various flows. At Pleaskin Head and 



THE GOBBINS, ISLAND JlAUtE. 

 Minor Flows, with Intermediate Bole Beds. 



