43 



region with the bafalt walls between which they lay; thefe freeftone walls 

 were more than a foot broad, and fometimes compofed of horizontal lami- 

 nse, and at others of vertical, 



I have fince difcovered a magnificent Dyke in the face of the ftupen- 

 dous precipice of Cave hill* which it cuts vertically near two hundred feet, 

 and is afterwards to be traced a great way down the hill. 



Though this Dyke be attended by very curious circumftances, I will 

 take no further notice of it, as I hope to fee it foon accurately defcribed 

 by my ingenious friend Dr. M'Donald, who was with me when I dif- 

 covered it, and whofe vicinity aifords him better opportunities of accu- 

 rately examining this beautiful and interefling fajade. 



* A ftratified bafaltic mountain, nearly hanging over Belfaft ; it is well worth the atten- 

 tion of naturalifls. 



(Fz> 



