44 



wards from Windy lake, giving an opportunity to examine 

 Laurentian granitoid gneiss near Windv lake and outcrops 

 of fresh norite to the east. Unfortunately the contact of 

 the norite with the gneiss is hidden by fluvio-glacial 

 deposits. 



Continuing eastwards the gray norite passes into a 

 reddish, syenitic-looking intermediate rock, and the valley 

 narrows between precipitous hills at Levak siding, where 

 the train will await the party and lunch will be taken. 



After lunch the walk will continue for two miles to 

 Onaping falls and Phelan. The micropegmatite phase 

 (acid edge) of the nickel eruptive occurs as a rather pale 

 gray rock when Onaping river is reached. Next is seen 

 the basal conglomerate of the Animikie much metamor- 

 phosed by the underlying eruptive sheet ; and this passes 

 at the beautiful Onaping falls into vitrophyre tuff crowded 

 with small glass fragments now turned to chalcedony or 

 serpentine. The walk of about 2 miles ends at Phelan 

 where there are good sections of the delta gravels formed 

 by Onaping river in a bay of ancient lake Algonquin. Here 

 the train will be taken to Larchwood. 



At Larchwood a short walk will be made to a good 

 example of the anticlinal hills of the interior basin. Ver- 

 milion river and the railway make their way across the 

 ruined southeastern end of the anticline. 



The train will then be taken to Murray, where a walk 

 of about 2 miles will show the gossan covered basic edge 

 of the norite resting on a complex of ancient lavas showing, 

 in places, amygdaloidal and pillow structures. The lava 

 when fresh has the composition of a norite, but is earlier 

 than the nickel-bearing norite and more basic in character. 

 Following a suggestion of Dr. Miller it is nrooosed to call 

 this effusive variety of norite Sudburyite. Its relation to 

 norite is similar to that of basalt to gabbro. 



A hill of this rock just south of the old Elsie nickel mine 

 affords a good view of the nickel range and the interior 

 basin. 



At Murray diamond drills will be seen at work determin- 

 ing the attitude and thickness of the nickel ore body, which 

 is already known to reach a depth of 1,100 feet and to in- 

 clude more than 10,000,000 tons. 



Return to Sudbury in the evening. 



