Gio Proceedings of the Royal Society of Victoria. 



about 100 paces south of the S. W. G. Co.'s eastern shaft, pitches 

 12° JST.; another, south of the Campbell's Creek Road, just above 

 where Dead Horse Gully joins the creek, pitches 12^ N. and is a 

 line example. Mr. H. W. Green, legal manager of the Ajax Co., 

 read uje the mining manager's reports for 1890, from which it 

 appeared that the anticline previously noticed in that mine 

 carried at the 900 feet level a small saddle-reef. This was 

 " driven on " north, for some distance, and, after undukiting 

 slightly, finally took a strong northerly pitch and passed under- 

 foot. Out of a total number of eight instances, in which I have 

 recorded pitch in my notes, seven showed a northerly inclination, 

 and the palfeontological evidence seems to point to a general 

 northerly pitch of all the rocks to the east of Castlemaine. 

 Professor J. D. Dana* points out that in order to get a thorough 

 knowledge of the pitch of strata in any disturbed district, 

 thousands of dips must be accurately plotted, a labour from 

 \vhich, for many reasons, I have shrunk. 



Dip. — Over the eastern portion of the district, from Barker's 

 Creek to the granite, there are numerous good exposures and dip 

 can easily be observed. Fi'om Elphinstone to Chewton the 

 railway cuttings give an almost continuous section ; while from 

 Chewton a water-race extends along the liill-sides as far as the 

 Ajax mine. To the westward of Barkers Creek the country is 

 more deeply masked by surface soil, the gullies are fewer and of 

 less importance, and the scrubby timber is thicker, so that T was 

 unable, after several futile attempts, to make any satisfactory 

 number of observations. The Maldon railway line has such 

 shallow cuttings that, for that part of the field, I have had in 

 great measure, to fall back on the recorded observations of others. 

 In I'ailway cuttings, where nearly vertical beds are cut obliquely 

 to their strike, the slope of the cutting gives an apparent dip in 

 different directions on opposite sides, and on hill-slopes especial 

 care must l)e taken, as surface slipping renders all observations 

 except on a north or south slope of little value. 



From Elphinstone, nearly to Chewton, the dip, owing to 

 constant inversion is westerly, and the bending over of the beds 

 can be well traced in many places. In the deep cutting at the 

 west end of the tunnel a fine anticline is displayed in grey 



♦ Nature, vol. xlvi., p. 154.; also Amer. Jour. Sci., June, 1S92. 



