440 PKOCEEDINGS OF THE GEOLOGICAL SOCIETY. [JuHC 18, 



15° to the west. At this place the plane of the rock appeared to be 

 a true one ; but it must be borne in mind that there is a great deal 

 of false bedding in the strata, so that my old observation, which made 

 the angle of dip only 8°, is not to be altogether discarded. The sand- 

 stone was observed running into the underlying breccia in tongue- 

 shaped masses. The last-named deposit was also carefully examined 

 for other stones than trappean rocks, but none were met with. There 

 was perhaps one exception, in which pieces of rounded quartz, of a 

 white colour, were seen. This specimen was not, however, observed 

 in situ, but occurred in the river- course, and might have come from 

 a distance. The fragments of the trap in the breccia were, for the 

 most part, angular ; but some few of them had lost their edges. A 

 considerable time was spent in attempting to find the breccia in 

 absolute contact with the trap -rock on the east side of the former, 

 in order to determine whether or not the former passed into the 

 latter and was interstratified with it, or if the trap was intrusive. 

 The appearance of the amygdaloidal rock in contact with the hardened 

 wall of red sandstone, on the Catrine side (fig. 2), would nearly lead 

 to the belief that the trap was intrusive, as some portions of the red 

 sandstone are mingled with it ; but still such hardened sides are not 

 dissimilar to what are sometimes seen on the sides of a great fault. 



The range of the trap here was N.W. and 



^. J. crz 7. ^ ^•-^* ' ^^^ ^^ ^^^ ^^^ present any apparent dip ; 



^^' tTo 7 ^^ but on the Ballochmoyle side, near Howford 



the Red Sandstone ^^.^^^^ ^^^ ^^^^ ^pp^^^ ^^ ^^^^^ ^^^ ^^^^ ^.p 



inthelm^-rock; totheKE. At this place also beds are seen in 



looJcmg Westward. ^^^^ j^^^-^^ ^^^ appearance of crumbling ashes. 



\^, 111 -Wi'i'iT ^t the point of contact between the trap and 



'. \/A\\\ the red sandstone, on the eastern side at Catrine- 





IK "^ 



1 V 



i -r^ 



.iji]i',i|i'i Holm, the latter rock contains small portions of 



i]iji]]li|j the blue and green carbonates and the sulphuret 



ill' 



'|i'|i|||i|]l of copper, as well as metallic copper. My spe- 



it;ri w ill. 1,1. ih cimens were small, and obtained at the surface, 



but it is probable that better specimens might 



a, a. Trap-rock. j^g discovered in cuttina- down by the side of 



o, 0. Ked Sandstone, ix, > at i.- • j. 



the trap. Native copper is not very common 



in Scotland, this being, in fact, the first instance of its occurrence in 

 Permian or Carboniferous strata there which has come to my know- 

 ledge. 



The high bank above Catrine-Holm, known by the name of 

 Ballochmoyle Braes, dips due west at an angle of 15°, which exactly 

 agrees with the dip of the Permian strata on the western side of 

 the trap before mentioned, and would appear to sanction the con- 

 clusion that the latter was stratified and not intrusive. However, 

 although the trap is placed in the section as interstratified and not 

 intrusive, my opinion on the matter is not very decided either one 

 way or the other, until further and more decisive evidence can be 

 obtained. 



The following is a rough section of the strata in the clifi" at 

 Ballochmoyle Braes: — 



