554 



parallel with the latter for a time, and then strikes a little 

 north of east. This outcrop was traced over two small tribu- 

 tary streams and for a distance of about a third of a mile, 

 but not quite so far as the main road, circumstances not 

 permitting a further examination in that direction, but it 

 is apparently obscured in that direction by surface wash. 



4. The siliceous limestones, which occupy an horizon 

 slightly lower than the main limestone, are once more 

 developed in a wide outcrop over the foot hills on the opposite 

 side of the creek to the main limestone just described. At 

 their southern extremity these beds are indistinctly seen on 

 the mine- road. In their extension northwards from the 

 road mentioned they occupy the western face of a ridge, 

 forming craggy outcrops. They just touch the angle made 

 by the Spring Creek about a quarter of a mile below where 

 the isolated fragment of the main limestone (2) is seen in 

 the creek, and then swing round to an easterly strike that 

 brings them almost in a line parallel with the creek as well as 

 with the main limestone on the opposite bank. Having reached 

 the creek, they are almost immediately obscured by alluvial 

 deposits that form successive and wide river terraces that 

 blend with the plains. These siliceous limestones, here as 

 elsewhere, exhibit differential weathering dependent on the 

 varying proportions of calcium carbonate in the rock. Alter- 

 nating lines of relief and depression give a striking 

 characteristic to the stone, more particularly in that the 

 laminae are much contorted, frequently making concentric 

 outlines, in domes and basins, which in some cases measure 

 up to six inches in diameter. 



(c) THE LIMESTONES IN THE SOUTH-EASTERN OUTCROPS. 



A third area of the limestone series forms the greater 

 part of the foot hills of Mount Remarkable on its south- 

 eastern side. The area forms a faulted segment of triangular 

 shape. The apex of the triangle runs out against the eastern 

 slopes of the mount, about a mile to the north of the township 

 of Melrose. It is bounded, on its western side, by the talus 

 of quartzite fragments of the lower slopes of the mount ; on 

 its eastward limits by Campbell Creek and the "Saddle Hill" 

 (so named from its saddle-like outline), near Melrose; while 

 the base of the triangle is formed by an east-west fault, 

 which brings the purple-slates up against the truncated lime- 

 stone series. 



This is the most interesting, but at the same time the 

 most difficult, field to map of all the limestone areas around 

 the mount. It has been subjected to greater distortion than 

 the other faulted segments, and has undergone not only much 

 crushing, through physical strains, but the beds have been 



