THE GEOLOGICAL AGE OF CENTHAL AND WEST CORNWALL. 197 



No. 27. A little farther to the west, in Q-loweth Farm, a 

 series of pits on the south side of the turnpike road marks the 

 position of another vein. This passes through Liskes in a N.N.E. 

 direction to BoscoUa, where it is intersected by one of the 

 ordinary felspar-porphyries of the district. From Boscolla — 

 where it is more than usually decomposed — it may be traced 

 without difficulty by Shortlane's End, Gwarnick, and St. Allen, 

 as mentioned by Mr. Barnett — the decomposed portions having 

 been largely dug out for agricultural purposes, under the local 

 name of ''Merl." 



Nos. 28 and 29. Still farther to the northward veins of 

 this rock have been met with in the workings of South Cargoll 

 Mine, and fragments of it may stiU no doubt be picked up on 

 the burrows (No. 28). It is also met with on the road a little 

 to the north of Fiddler's Green (No. 29), a little village lying 

 about a mile to the W.S.W. of Newlyn, where it was shewn to 

 us in a shallow road cutting, by Mr. Clarke, in the summer of 

 1880. 



Nos. 30 and 31. These veins are near the mouth of the 

 river Gannel, where we saw them in July, 1880. The more 

 westerly vein of the two which are marked on the Survey Map 

 as cropping out on the north shore, consists of two distinct 

 branches, the wider of them being at least 40 feet thick. The 

 vein a little to the east is an ordinary elvan. The trap runs in a 

 N.E. direction, cutting through slates whose general dip is S.E., 

 but which are much contorted. No. 31 appears to be the southern 

 continuation of this vein — it passes near Penpoll, and then dis- 

 appears beneath the Crantock sands. A vein (No. 32) which may 

 perhaps be the same as No. 31 comes out in the cliffs of Holywell 

 Bay, 1^^ miles to the south-eastward of the point last mentioned. 

 The vein points directly to the outlying rock known as the 

 Carter's Gull Eock, and we have been informed that mica-trap 

 exists there also, but as our informant was not a geologist, it is 

 possible he may have been mistaken. The sea here is generally 

 very rough, so that it is not often one has an opportunity of 

 visiting such an inaccessible place. 



Nos. 33 and 34. Farther to the north a much-branched 

 series of veins of very fine-grained mica trap appears in the 

 cliffs at Newquay, near the little pier on the northern side of the 

 " neck," cutting through the interstratified limestones and slates 



