OF PIGEON POINT. 



399 



ning northeast into the Lake. Next succeeded a fine-grained basaltic trap (No. 

 661), forty feet high; then a dike composed of coarse-grained trap in the centre and 

 fine-grained trap adjoining. 



The next place of importance afforded a coarse porphyritic trap (No. 662), con- 

 taining crystals of felspar, sometimes two inches cube ; then pebbly beach, with 

 narrow trap coming to the Lake in three places, the last a considerable point, nearly 

 three miles from the mouth. Here a dike of basaltic trap, fifteen feet wide (Nos. 

 663, 664, and 665), has carried up thirty-five or forty feet of slate on each side and 

 altered it (No. 666). This dike continues several hundred yards. Next occurs a 

 rock (No. 667), which may be termed a syenite, although there is very little quartz 

 compared to the amount of felspar and hornblende. 



Soon after, the shingle was so low that I could see across the cape, and, on 

 stepping it, found the distance only about two hundred and twenty feet. Por- 

 phyritic trap succeeds the low shingle, traversed north and south, at one place, by 

 a narrow dike. Then follows a small bay of shingle beach, and again trap, twenty- 

 five to fifty feet high, large-grained and porphyritic. The ridge here rises to one 

 hundred and fifty feet, or more, and then gradually descends to thirty, twenty, and 

 ten feet. Finally, a shingle beach, with a few greenstone rocks, in place, at the 

 extreme end, terminates Pigeon Point. After turning in a direction south of west, 

 and again passing the low shingle beach, a trap dike occurs (supposed, from the dis- 

 tance and bearing, to be the same seen on the other side), altering slates on each 

 side a long distance. Then succeeds a reddish-coloured rock (No. 668), even less 

 syenitic than No. 667. 



The apparently metamorphosed rock (No. 669) was succeeded for a long dis- 

 tance by shales, dipping 40° south-southeast, and exhibiting great signs of disturb- 

 ance at one point, where a dike cuts through. Next follows some shingle beach ; 

 then a fine dike, twenty feet high, cutting through and altering slates, which dip as 

 before. Then follows another dike, fifteen feet wide, overlying the slates, which 

 dip 40° to the Lake, in a southwest direction. This must be about three miles 

 from the extreme point, as it is in sight of the islands which front Grand Portage 

 Bay, and about a mile east of a bay, known as Morrison's Bay, from its being the 

 great fishing-station for a half-breed Indian of that name, belonging to the Grand 

 Portage band. 



We soon after passed the calcareous vein seen on the other side. It bears 

 northwest and southeast. There were here also several smaller veins. Near this 

 place, the altered slates began to assume a columnar appearance, the columns being 

 at right angles to the dip. Two dikes soon after appeared as the cause of the great 

 local disturbance here, for, in their neighbourhood, the slates were entirely tilted 

 on edge. (Specimens Nos. 670 and 671 were taken from this spot.) Farther on, 

 the slates continue altered, and after passing a small bay, an east-aud-west dike of 

 trap, which projects into the Lake, has tilted the slates on each side to a high 

 angle ; the dike is, as usual, about fifteen or sixteen feet wide, while the slates are 

 fifty or sixty. 



After crossing Morrison's Bay, the dip of the slates is reduced to 18° and 20° 

 south-southeast; but at a point not very far from there, they are again upright for 

 a short distance. 



