254 DESCRIPTIV.ECCATALOG UR 
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 
“ Kntry Point.” 
595. Metamorphosed shale. Traversed by numerous joints and cracks; the 
joints containing partings of caleareous 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 places 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. 596. 
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; joits 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 
