254 



DESCRIPTIVE CATALOGUE 



surfaces. Resembles the N. 45° E. dikes more than any others. Very heavy. 

 Magnetic. In the second bay, and the points of third and fourth bays, below the 

 " Entry Point." 



595. Metamorphosed shale. Traversed by numerous joints and cracks; the 

 joints containing partings of calcareous and magnesian minerals in their scales. 

 Colour, greenish gray; general tint, greenish, like the green slate of St. Louis 

 River. Very fine-grained ; contains small pebbles of a soft, green-coloured magne- 

 sian rock, like itself. Numerous minute dark points, arranged in lines or strings ; 

 which may be chlorite, but are, most probably, as the rock disturbs the needle, 

 magnetic oxide of iron. It is easily fractured, breaking into irregular rhomboidal 

 masses. It is traversed by joints, so that it is almost impossible to procure a frac- 

 ture by which the structure of the rock can be seen. In some jnaces it is very 

 fissile, but dividing irregularly, and into rather small, scaly-like fragments. It is 

 distinctly fine granular, and resembles, a good deal, some of the specimens about 

 " Hat Point," and particularly some of the slaty beds of Prince's Bay and Spar 

 Island. This rock is traversed by a number of narrow N. and S. dikes, like No. 

 592 ; and in immediate contact with some of these dikes, this rock is converted into 

 No. 59G. 



596. This rock is of a bright brick-red colour; very hard; crystalline, and, seem- 

 ingly composed, in great part, of felspar. On a horizontal fracture, it has a granular 

 appearance ; the grains being mostly red, with numerous black or greenish black 

 grains disseminated through it. On a cross fracture, the red felspar seems to be 

 arranged in minute acicular crystals, from the sixteenth to one-eighth of an inch 

 long, and radiating from points. Cracks filled with very thin seams of a mineral, 

 which is probably quartz. In this respect, the rock resembles the lower Palisade. 

 This rock appears to be highly felspathic, and differs, originally, in composition 

 from the mass of the green shales. 



597. Bears N. 45° E. A very dark brownish-red trap. Very ferruginous. Does 

 not disturb the needle. Crystalline ; composed of felspar, hornblende, and iron. It 

 bears some resemblance to No. 596, but has, probably, been derived from the great 

 greenstone dikes, and is an overflow, bedded among the schists, and subsequently 

 altered by later dikes, along with the schist and marl-beds, which have reacted on 

 it. It weathers with a dark red, rusty surface, but does not scale. I am uncertain 

 whether to collate it with No. 596, or with the greenstones. (See No. 599.) 



598. Bears N. 10° E. This is a fine-grained greenstone. Colour, grayish green; 

 jointed ; joints with thin sheets of carbonate of lime traversing them. In some 

 parts, the structure is almost homogeneous. Approaches more nearly to the bedded 

 shaly rocks of Kinechigakwag Creek and Big Fork River, which I have called 

 " slaty greenstone," than any of the other systems of dikes. This is a narrow dike, 

 well exposed, and easily traced on the Lake shore. 



599. This rock is traversed by the dike No. 598, and the specimen which was 

 taken from the junction is exceedingly hard and compact; of a deep brick-red 

 colour ; and seems to be composed, in most part, of deep flesh-coloured felspar, like 

 No. 596 ; and from its analogy to No. 599, I am inclined to the opinion, that they 

 may all, probably, belong to the same beds, and should be placed with or near to 



