40 E. 0. Teak: 



on acount of the intense folding and crushing to which the series as 

 a. whole has been subjected, together with the sporadic and appar- 

 ently erratic distribution of the fossils, which are mainly grapto- 

 lites in poor state of preservation, and Protospongia. The only 

 fossils obtained from the Cambrian in this region are Proto- 

 spo7igta, and possibly radiolaria from black cherts similar to those 

 of Heathcote. 



Camhrian (Keathcotian Series). 



The rocks of this series fall into two groups : — 



1. Basic igneous rocks (diabases in part), and associated tuffs, 

 with their alteration products. 



2. Protospongia cherts. 



A. — The Diabases. 



1. The basic rocks referred to here form an important central 

 occurrence in the area under consideration. There are two l>elts, 

 more or less parallel, but of unequal size, both, however, Avith a 

 general north-west to south-east direction. The largest and longest 

 starts outside of the area at least a couple of miles to the north- 

 Avest, and passes out of the map in the south-east, where its exten- 

 sion has not been examined. Its greatest width ia about 1| miles; 

 the outline is somewhat irregular along portion of its north- 

 eastern side, where it comes in contact with the dacite jjorphyry, 

 but otherwise the junction and trend conform closely with the 

 general strike of the enclosing sediments. 



The smaller belt is shorter and narrower, and ends bluntly on 

 the Howqua, as shown on the map. It would appear to diverge 

 somewhat in direction from the larger belt towards the south in 

 the Cameron's Creek area, which has, hoAvever, been only imper- 

 fectly traced. 



In general, the boundary of these rocks is readily traced in the 

 field, on account of the sharja soil change from the rich dark red 

 of the diabase to the poorer slaty soil of the surrounding rocks. 

 The open, park-like and grassy slopes of the diabase, too, are often 

 in striking contrast to the closer forest Avith scrub undergrowth 

 of the sedimentary rocks, so that from suitable vantage points the 

 general bearing and limits of the tAvo formations can be distinctly 

 observed from a considerable distance. This is quite analogous to 

 the "clear country," of the serpentine area in the Dolodrook. 



