IV.—On THE UPPER CAMBRIAN AGE OF THE DICTYONEMA 
SLATES OF ANGUS Brook, NEw CANAAN AND KENTVILLE, 
N. S—By dH. M. Ami, D. Sc, F. G.S., of the Geological 
Survey of Canada. 
(Read 10th February, 1902.) 
In his “ Acadian Geology,” second edition, 1868, p. 563, Sir 
William Dawson figures Dictyonema Websteri and places it as a 
Silurian (Upper Silurian) species. In describing the slates from 
which the type-specimens of this species were obtained he 
writcs: “ Passing from the Cobequid Mountains to the slate 
hills of the south side of the Bay” --meaning the Bay of Fundy 
—‘in Kings County, we find slates not very dissimilar from 
those of the Cobequids,’—which he had described on the previous 
page, 562—‘“in the promontory northward of the Gaspereau 
River. Here the direction, both of the bedding and of the 
slates structure, is N. E. by 8S. W.; but the planes of cleavage 
dip to the 8. E., while the bedding, as indicated by lines of 
different color, dips to the N. W. These slates with the quartzite 
and coarse limestones, are continued in the hills of New 
Canaan, where they contain crinoidal joints, fossil shells, corals, 
and in some beds of fawn-coloured slate, beautiful fan-like 
expansions of the pretty Dictyonema represented in fig. 196. 
Very fine specimens of this fossil were found by the late Dr. 
Webster of Kentville. It was the habitation of thousands of 
minute polypes, similar apparently to those of the modern 
Sertularia. The general strike of the rocks in New Canaan is 
N, E. and S, W., and they extend from that place westward to 
the Nictaux River. Westward of Nictaux River, as already 
mentioned in describing the Devonian, the beds of the Upper 
Silurian, as well as those of the last mentioned formation, are 
nterrupted by great masses of granite which form the hills 
along the south side of the Annapolis River, from a place called 
(447) 
