] 94 THE GEOLOGICAL AGE OF CENTEAL AND WEST COE^^WALL. 



Nos. 11 and 12. Two other little bands of tWs rock, also 

 marked as greenstone or trap on the survey maps, appear near 

 the place marked Landeryah, about a mile and a half to the 

 ■west of Mylor Church, 



No. 13. This is a vein of the trap which occurs on the 

 north side of Mylor creek. It is evidently the continuation of 

 No. 10. 



No. 14. The only occurrence of this rock with which we 

 are acquainted on the eastern side of CarrickEoads is at a point 

 about a quarter of a mile above Mesack Point-^where it was 

 discovered a few years ago on the occasion of an excursion of 

 the Truro Geological Class. At that time (and probably it is 

 so stilll it had been worked away below by the tide so as to 

 form a picturesque cave or natural arch. This locality is not 

 marked on any published map known to us. 



No. 15. This vein appears on the survey map as a trap or 

 greenstone — at a point on the south side of Eestronguet Creek 

 just above the bar. 



No. 16. Is the continuation northward of 15, i.e. on the 

 north side of the creek. 



No. 17 to 22. These are for the most part marked on the 

 survey map in faint dotted lines, but not coloured — either as 

 elvans or "traps." Apparently there existed some doubt as to 

 their true nature at the time the map was made. Mr. Barnett 

 was the first to publish any description of the intrusive rocks of 

 this part of the Truro river (see supra, loc. cit). The principal 

 and most characteristic vein of this group (17) occurs on the 

 north side of Pill Creek, a small inlet about a mile above 

 Eestronguet Point. It proceeds from thence in a direction a 

 little east of north to Channel Creek, where it may be seen on 

 both shores in several places.'^'' 



The vein on the north side of the creek splits into two, one 

 branch coming out on the shore of the river near King Harry's 

 passage (No. 18) while the other passes on to Eoundwood (19), 

 where it is visible in the creek. From this creek it passes on 

 to Halwyn Parm (20), after which it divides, one branch passing 



* On tlie south side of the creek near the Trelissick fisb ponds, at the head of 

 the creek, we found no fewer than 4 distinct bands, or veins on Easter Monday 

 of 1878. 



