566 



action, with secondary developments of specular hematite, 

 chlorite, etc. 



No. 7 . — This is a round knoll of basic igneous rock, on 

 a small rise situated on the north-eastern side of the old mine-, 

 and is probably continuous with another outcrop of a similar 

 kind on the next ridge on the eastern side. The two outcrops 

 are separated by a small intervening valley, mantled by rain- 

 wash. 



No. 8. — On the eastern face of the ridge last-mentioned 

 there is an outcrop of a siliceous igneous rock which makes a 

 peculiar and isolated feature among the surrounding basic 

 dykes. The rock is aplitic in character, very acid, and forms 

 a lenticle, 30 feet in length, margined on all sides by sedi- 

 mentary rocks. There is probably another outcrop of a 

 similar kind in a ,small valley just below the old copper mine, 

 as two or three surface stones were met with there of an 

 aplitic type, but these contained a little more felspar in 

 their composition than in the other case, and also a few small 

 sporadic crystals of schorl ; it was not seen in situ. 



No. 9. — On the next spur, in an easterly direction, 

 there occurs the most prominent outcrop of igneous rock in 

 the locality. It is situated about 60 yards eastward of the 

 aplite vein, and forms a dyke-like ridge of rock that rises 

 about three feet above the normal level. It is of limited 

 extent, much fractured under weathering, and is bounded 

 on all sides by limestones and calcareous shales. 



No. 10. — Situated at about 70 yards in an E.N.E. direc- 

 tion from the aplite vein (No. 8) is another basic dyke. It 

 is even with the surface of the ground and occupies the slope 

 of a spur towards the Cathedral -rock Creek. 



No. 11. — This igneous outcrop forms a knoll on the top 

 of the ridge, and is situated in a direction S.S.E. from out- 

 crop No. 9. It is not far distant from the western edge of 

 the main (Brighton) limestone, from which it is separated by 

 a zone of slaty rock that has been somewhat changed by the 

 igneous contact. The ridge, which follows the right bank of 

 Cathedral-rock Creek, forms an angle with a still higher ridge 

 that faces into the Mount Remarkable Creek. The igneous 

 outcrop now under description occurs at the angle of these 

 two ridges, and has a strike N.E. and S.W. It possesses 

 some anomalous features. In the first instance (at its north- 

 eastern end), it has the features commonly presented by the 

 basic dykes of the neighbourhood, but as it rises to the crest 

 of the higher ridge it passes into a peculiar rock of a somewhat 

 acid type. A marked feature at the surface is the presence 

 of numerous empty spaces, giving the rock a honeycomb 

 appearance. It contains some quartz, with phenocrysts 



