298 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [JlUie 1, 



although difPering in outline, owing to the glacial accumulation, from 

 Disco Island and other well-known parts of the coast to the south- 

 ward, the rocks can be referred with certainty to the same trappean 

 formation. Specimens of greenstone-porphyry were taken from the 

 cliffs at Petowak, near Cape Atholl. 



Wolstenholme Sound to Cape Hatherton. — Northward of Cape 

 Atholl we find, in the entrance of Wolstenholme Sound, a flat island 

 (Saunders Island), which from its distinctly stratified appearance 

 suggests the commencement of a different series of rocks. And 

 eastward of the same cape, on the south shore of this Sound (Sketch 

 No. 3, a and h), the strata are seen cropping out with a dip to the 

 south-west. This is at variance with what we observe in Saunders 

 Island, about twelve miles N.N.W., for there the strata are perfectly 

 horizontal. At North Omenak (Sketch No. 3, d) a sandstone, or 

 slaty quartzose grit, with a dip of about 15° to W.S.W., occurs inter- 

 stratified vnth greenstone-porphyry ; and it is very probable that 

 Mount Dundas, a tabular hill vrith a talus (Sketch No. 3, e), is also 

 composed of igneous rock. At the top of Wolstenholme Sound, in 

 the same bluff, the strata, dipping about south-west, vary in their 

 inclination from 1 0° to 25° or 30°. In Granville Bay (Sketch No. 5), 

 about twenty miles farther north, the strata are at one place (at a 

 in the Sketch) but little out of the horizontal, and at b the dip is about 

 45° to the north-west, and at c we have strata somewhat curved. In 

 the entrance of Granville Bay several small islands occur (Sketch 

 No. 5, d), which are probably formed of trap-rock. In Booth Sound, 

 lat. 77°, near Cape Parry (Sketch No. 6, a), there is a very remark- 

 able bell-shaped rock (Fitzclarence Rock), of a dark colour and rising 

 in an isolated form to a height of probably 500 or 600 feet, as if from 

 out of a comparatively level spit of ground : this also appears to consist 

 of similar rock. From Cape Parry (lat. 77° 5') north-eastwardly 

 to Bardin Bay (lat. 77° 20'), in the south shore of Whale Sound 

 (Sketch No. 6, c), the strata incline a little to the S.W., and in many 

 places they are somewhat curved. Still farther to the north-east they 

 have a general dip of 30° to S.W., and they are intersected by irregular 

 dark-coloured dikes of igneous rocks. One of these dikes (Sketch 

 No. 6, b) rises in the form of a rough peak above the outline of the 

 strata. In the entrance of Bardin Bay, the ship, drawing ten to 

 twelve feet of water, struck upon a rock, which from the depth of the 

 water (fifty to sixty fathoms) within a couple of hundred yards, may 

 be a second protrusion of the same dike above the stratified rocks. 

 Specimens of quartzose grit were obtained from the low point (Sketch 

 No. 6, d) on the north-east side of Bardin Bay, and were taken from 

 strata inclining W.S.W. at a general angle of 15°, but a little curved. 

 In them we recognize the same sandstone as that of North Omenak, 

 about sixty miles to the southward. A specimen of syenitic porphyry 

 was taken from the shoulder of the hill in the vicinity of the dike 

 above-mentioned (Sketch No. 6, b). In other parts of Whale Sound 

 (in Northumberland, Herbert, and Milne Islands) the strata are per- 

 fectly horizontal ; and at Cape Saumarez (Sketch No. 7, a), on the 

 same coast, but thirty miles further north, the same strata can be 



