of Devonshire aiid Cornwall. 1 53 



The grauwacke slate appears on the right or eastern bank of the 

 teyl, and continues without interruption as far as R.edruth. Never- 

 theless, we are upon its boundary near Camborne, and I should not " 

 be surprised If that place, which lies a little to the right of the road, 

 were on granite, for the ground rises in that direction, and at a 

 small distance the Tors make their appearance. I had already ob- 

 served the grauwacke at several places on the Bristol Channel, but 

 it was of so small extent, that I found It Impossible to judge, whether, 

 according to my expectations, the strata dipped N.W. on the 

 northern slope of the chain. There was every reason to expect 

 that this would be the case, as the strata on the opposite side of the 

 chain, have, as 1 have shewn, the contrary slope ; I was therefore 

 much gratified when I found my expectation realized in the course 

 of an excursion I made from Redruth to Portreth, the nearest sea- 

 port, and three miles to the N.N.W. 1 had at the same time a very 

 agreeable walk, and it is the only place where, in this part of the 

 country one could forget for an instant, being in the midst of a 

 mining country, and I may also say in the midst of ruins, for be- 

 tween Camborne and Scorrier House, there Is hardly any vegetation 

 to be seen. The ground is on all sides torn up and covered with 

 rubbish and excavations. 



In order to go to Portreth, we follow the course of a brook, along 

 tlie sides of which there are some stream -works : the country gra- 

 dually lowers, and the verdure of the meadows foretold the approach 

 of the sea, which we very soon discovered, and as we w^ent through a 

 narrow and woody pass, it had quite the appearance of a lake. 

 When we reached the bottom of the bay, we found the grauwacke 

 fully displayed ; the angle which its strata make with the horizon 

 is nearly the same as that which was formerly mentioned. 



u 



