448 UPPER CAMBRIAN AGE OF DICTYONEMA SLATES OF 



Paradise to Bridgetown, and with some interruptions nearly as 

 far as the town of Annapolis." 



In my " Synopsis of the Geology of Canada,"* the following 

 paragraph refers to the Silurian of the region in question as pre- 

 sented and systematized from the accepted and available sources 

 of information : 



'' In the County of Annapolis, Nova Scotia, and in the 

 vicinity of Nictaux, Silurian strata occur, including the Nictaux 

 iron ore beds and the Torbrook sandstone formation, whilst near 

 Kentville, the Kentville formation is seen as well as on Angus 

 Brook in the Gaspereau Valley, also at New Canaan with 

 Dictyonema Wcbsteri, Dawson." 



Slates holding Dictyonema Websteri, Dawson, and thus 

 known to occur : (I) At New Canaan, the t\pe locality ; (2) At 

 Kentville, N. S., and (3) along the upper portion of the valley 

 of Angus Brook, a small stream entering the Gaspereau River 

 between the village of Gaspereau and the Avon River shore. 



The general section of the rocks holding the specimens of 

 Dictyonema and the truly Silurian fossil-bearing strata of the 

 district, in which corals and encrinites and brachiopods occur, as 

 furnished me by Sir William Dawson some years ago, distinctly 

 showed that he connected the two in a general way only, follow- 

 ing the inclination and strike of the strata in that part of Nova 

 Scotia which have been affected by the same physical forces 

 that disturbed rocks belonging to various members of the Palaeo- 

 zoic succession. It is thus seen that the intrusive masses of the 

 district have affected not only the Cambrian strata, but likewise 

 the later deposits, exclusive of the rocks of the Horton and its 

 underlying co-formation, the Gaspereau formation, and the 

 Grand Pre formation of later Triassic Age. 



Heretofore, the slates which have yielded the specimens of 

 Dictyonema Websteri have been invariably referred to the 

 Silurian system, but more recent examination of the type 

 specimens of D. Websteri, have revealed a remarkable resem- 

 blance to, and the close affinity of this species with the 



Trans. Royal Soc. Can., 2nd Ser., 1900-1901, Vol. VI., Sect. VI., p. 203. 



