THE GEOLOGICAL AGE OF CENTRAL AND WEST CORNWALL. 189 



f Stray Park, Camborue, Hornblende schists ") 

 . I W. Gons, „ „ SDip. S.W. 



'^."u I Camborne Vean, ,, ,, ) 



0S-J3 \ Dolcoath, ,, dark schists, ~1 



2-^ 1 ^. W. Crofty, ,, dark micaceous schists and crystalhne | 



§ "^ <i hornblende schists, 18°— 70° | j-,- 



-^ § I S. RosTcear, „ Hornblendic schists, 32° [-^ of N 



I ^ I Cool's Kitchen, Illogan, dark schists I ia,o_qno 



O^lCarnBrea, „ dark schists, 30° P* "*" 



'"' I Tincroft, „ dark schists, flat | 



L^. Pool, „ „ „ J 



g . fPolberra, St. Agnes, "^ 



flu I PF. Pink, „ I 



^'S -i W. Prudence „ J» Mostly light-coloured, Dip. S.E. 



^•2 I Gt. St. George, „ \ 



02'"' [_W. Budnick. „ J 



All the rest of the mines in the St. Agnes district have 

 schists with a S.W. Dip. 



_j^ fW. Buller, Gwenuap, dark coloured schists, ") 



2 i W. Beaucliamp, „ „ „ | ^^ E. of N. 



^-S Iresaveayi, „ ,, ,, }■ -jjgo 4Q0 



Consol'd. Mines, E. part, Gwennap, dark coloured schists, j 

 J Cardreiv Downs, Eedruth _ ,, ,, J 



^« 



^ 



W. Falmouth, dark coloured schists same strike, Dip. S.W. 

 Consold. Mines,W. part, Gwennap, light coloured schists, "^ Dip. 



United Mines, „ „ „ ( mostly E. of S. 



Ting Tang, „ „ „ \ ^ few 



^iV. Downs, Eedruth, „ ,, „ J W. of N. 



It has been usual to refer these marked variations of dip to 

 the effects of the granitic intrusions, but, as was shewn in the 

 former paper, such effects are for the most part very slight 

 indeed as regards the dip, and almost inappreciable as regards 

 the strike of the stratified rocks. From the observations quoted 

 above — which might readily be extended — it would appear that 

 the mines of Grwinear, Crowan, Illogan, and the greater part of 

 St. Agnes and Gwennap are in Lower Silurian rocks, striking to 

 N. of East ; while those of Breage, Sithney, the remainder of 

 St. Agnes, and the southern and western part of Gwennap, are in 

 strata of pre-silurian age, striking to W. of North. However 

 this may be, it will of course be understood that the mineral 

 veins themselves are of greatly subsequent date, cutting in- 

 discriminately through the stratified rocks of all ages, as well as 

 through the intrusive associated masses of granite and elvan. 



