Geology of Casthinaine, &c., witJi List of Minerals. 71 



From the outcrop mentioned, west of Burns' Reef, I have 

 traced this zone in a northerly direction as far as Donkey Gully, 

 where it is found passing to the west of the Crown Nimrod shaft, 

 a distance of a mile and a quarter. Another outcrop occurs in 

 Deaf Ben's Grully, a mile to the south of Burns' Reef, but not on 

 the same strike, as the beds repeat to the east. Another outcrop 

 occurs in the railwa}' cutting, twenty paces west of Ten Foot 

 Hill Bridge, and is traceable in a southerly direction for about a 

 mile. At the head of Victoria Gully it is found to overlie an 

 outcrop of the Burns' Reef beds, being separated from them by a 

 thickness of about 230 feet of sandstones and coarse grits. An 

 outcrop is also seen on the east side of New Chum Gully, close 

 to the Ajax anticline. 



Tlie next zone is a well-marked one. Tetragraptus cadiiceus 

 occurs in the greatest profusion ; I think fully eighty per cent, of 

 the specimens belong to this form. Several good exposures 

 occur, and a great part of my earliest collecting was done on the 

 various outcrops of this zone. Phyllograptus, as before mentioned, 

 has disappeared, while immediately below it is fairly abundant. 

 One or two species of Diplograptus occur somewhat commonly, 

 though rare below this horizon, together with several species of 

 Didymograptus and one of Dichograpius, which I have not yet 

 identified with certainty. In Victoria Gully, where a spoil-heap 

 from a small mining shaft on the east side of the gully yielded a 

 good collection of forms, I was able to measure the thickness 

 separating this zone from the one below, and found it about 250 

 feet. This estimate was checked in the railway cutting about 

 half a mile north, and the results were in accord, as I measured 

 the distance west of the Phyllograpto-caducei(s zone, and found 

 the T. caditceus zone at the required spot. 



The next zone contains Loganograptus Logani associated with 

 numerous examples of T. caduceiis. An outcrop occurs at the 

 head of John o' Groat's Gully, being separated by a thickness of 

 300 feet from the T. cadiiceus zone below, both occurring on the 

 same side of the same (Ajax) anticline. It is on the strike of 

 the eastern limb of this anticline that Professor Sir F. McCoy 

 records Logatiograptus from Barker Street, Castlemaine. As far 

 as I can learn the spot was in front of the Mechanics' Institute, 

 and is now inaccessible ; but in a yard behind one of the shops I 



