568 



a rather prominent outcrop of impure limestone, at a height 

 of about 40 feet above the Mount Creek. 



No. 17. — On the same slope, facing to the Mount Creek, 

 slightly further up the creek than the conspicuous pillar of 

 crush-rock on the side of the hill, is another basic outcrop. 

 The igneous rock passes up the slope from the river flat to a 

 height of about 50 feet above the stream, and is about 40 feet 

 in width. 



No. 18. — This is the furthest-south outcrop of the dykes 

 in the igneous field. It is situated about a third of a mile 

 higher up the Mount Creek than the last-described occurrence 

 and on the same side of the stream. It has intruded the 

 siliceous limestones, which are here strongly developed and 

 have undergone extraordinary crush. The dyke is indicated 

 chiefly by surface stones, one of which is two feet in diameter. 

 It appears to have but a limited extension. 



Group (d) ON THE EASTERN SIDE OF THE MOUNT REMARKABLE 



CREEK. 



No. 19. — An inconspicuous outcrop occurs on the eastern 

 side of the Mount Creek, a little southward of the great spur 

 of the main limestone, where it comes down to the creek 

 level. A few igneous rocks are seen in situ in the bank, on 

 a small piece of road-cutting, about 20 feet above the level 

 of the stream, and loose stones can be traced up the rise for 

 about 20 yards or 30 yards. It lies on the western side of 

 the main limestone, but not in contact with that rock. 



No. 20. — Exposed by a few surface stones and an obscure 

 outcrop on the slope facing to Campbell Creek. 



No. 21. — A broadish ridge separates Campbell Creek 

 and the next creek on the right bank of the Mount Creek. 

 A basic dyke outcrops on this ridge, near the centre and about 

 half-way up from the Mount Creek, in a direction south- 

 westerly from No. 20. It is in the form of a patch, and 

 nearby the rock is much veined by hematite, which has led 

 to some prospecting for minerals. 



IV. — Tectonic Structure. 



Mount Remarkable forms a great wedge-shaped mass of 

 intimately- jointed quartzite which, although of great width, 

 is almost destitute of massive outcrops. The summit and 

 slopes of the mount are littered with countless fragments of 

 angular rocks. The eastern side is particularly steep, giving 

 rise to scores of screes, or shoots of loose stones, which in 

 many cases extend from the summit to the base of the mount. 

 The whole mountain is undergoing rapid waste by the break- 

 ing up of the rock on the joint-planes, and then by the loose 



