12 GEOLOGICAL SUR\'EY, CANADA. 



jectured. This is notably the case, for example, in regard to his 

 formation IX — described as a dark grey clay slate. An east and 

 west section across the peninsula which terminates in Jackpine 

 point, made from the shore about three-fourths of a mile south of 

 that point, showed clearly that no such formation exists as mapped. 

 The rocks in the area mapped as clay slate are coarse agglomerate 

 schists, cut by great dykes of greenstone. The surface here is 

 particularly open and well exposed, and one may walk freely over 

 the bare rocks. The supposed clay slates which crop out on the 

 shore at Smyth's locality 81, appear to be a local facies of the 

 agglomerate formation particularly well sheared, and having a very 

 limited distribution at and close to the shore, and grading into the 

 agglomerate. Formation IX, as distinct from VIII, appears, there- 

 fore, to be non-existent; and the syncline which is based upon the 

 supposed distribution of clay slate and agglomerate can no longer 

 claim recognition. 



Tlie agglomerate VIII, and the belt of greenstones and green- 

 stone schists VII — which lies to the east of it — are typical Kee- 

 watin formations, indistinguishable from and continuous with the 

 belt of Keewatin rocks of the north side of the Seine river which 

 has been traced through from Eainy lake. To the east of the belt of 

 greenstones and greenstone schists VII, is a narrow belt of con- 

 glomerate — Smyth's ' Upper conglomerate ' VI. This conglomer- 

 ate was conjecturally, but approximately correctly, mapped by 

 Smyth. I have confirmed his mapping by tracing the conglomerate 

 through from its outcrop on the end of the peninsula west of East 

 bay to the south end of Straw Hat lake. This lake was evidently 

 unknown to Smyth, although the exposures on its shores are of the 

 utmost importance for the interpretation of the structure. It lies 

 parallel to East bay, two-fifths of a mile west of its south end. The 

 course of the conglomerate belt for the distance indicated is parallel 

 to that of Smyth's conglomerate I, on the east side of East bay. 

 East of the conglomerate is a limestone, which occupies for the 

 most part a depression extending through from Falls bay to the 

 south end of Straw Hat lake. The limestone is exposed at both ends 

 of Straw Hat lake, and is identical in character with the limestone 

 on the east side of East bay, Smyth's formation II. It evidently 

 underlies the waters of the lake. Between the north end of Straw 

 Hat lake and Falls bay it is exposed at intervals, and numerous 

 blocks of it occur in the depression. The depression ends in a little 



