136 INDEX TO THE STEATIGRAPHY OF NOETH AMERICA. 



evidence of discordance is found along the whole length of that hne. A new and well-marked 

 instance of this was seen near the head of Eel River, in South Richmond, Carleton County, 

 where heavy beds of bright-red slates, associated with amygdaloidal diorites, have afforded 

 large fragments to the overlying Silurian beds. 



An effort was then made to determine the limits of the fossiHferous Silurian rocks previ- 

 ously discovered by Mr. Wilson. Fossils similar to those obtained by that gentleman, but 

 occurring very sparsely, were collected at several points on Eel River, and strata exhibiting 

 similar associations were followed for 6 or 8 miles in the direction of the St. John River. Here, 

 however, approaching the great granite belt, they not only failed to yield fossils but became 

 so greatly altered as to be recognizable only with difficulty. In connection with this work 

 the fossUiferous slates were found to be associated throughout with heavy beds of slaty con- 

 glomerates, the composition of which, though somewhat different from that of the South Rich- 

 mond conglomerates, equally indicates their derivation from the supposed Cambro-Silurian 

 and Cambrian strata. The course of these conglomerates is therefore provisionally regarded 

 as marking, upon one side at least, the line of separation of the two systems in the parish of 

 Canterbury. The southern side, owing to progressive metamorphism, can not be definitely 

 assigned. 



So far, the conclusions reached * * * were based upon stratigraphical and litho- 

 logical grounds only. But near the end of the season * * * new and most important 

 evidence, tending to confirm the views already reached, was brought to light. This consisted 

 in the discovery near the village of Benton, in Carleton County, of a band of very black, more 

 or less graphitic slates, associated with gray and white quartzites and containing a few layers 

 charged with large numbers of graptolites of the genus Dictyonema. Among these 'were some 

 of large size (2 J by 3 inches), showing both in their outlines and in the dimensions and structure 

 of the polypary a very close resemblance to the form D. sociale or D. Jiahelliforme Eichwald, 

 occurring in rocks of Cambrian age on Navy Island, in the harbor of St. John, as well as at Matane, 

 in the Province of Quebec. They are regarded as identical by Dr. H. M. Ami, after careful 

 studies and comparisons, and Dr. G. F. Matthew (by whom the Navy Island form has been 

 figured and described) is also disposed to adopt the same view. It would seem, therefore, that 

 although the occurrejice of a single fossil species is in itself very insufficient evidence upon 

 which to determine and represent the horizon of a great group of strata, yet, when this is taken 

 in connection with the stratigraphy of the region, pointing as it does in the same direction, a 

 strong presumption is established in favor of the Cambrian age of the beds yielding these forms." 



L 20-22. NEW BRUNSWICK, CAPE BRETON, AND NEWFOUNDLAND. 



In 1900 Matthew contributed to a paper by Ami ^^ the following statement of 

 the succession of formations within a radius of 20 miles of St. John, New Brunswick: 



« For further details see Repts. Geol. Survey Canada, new ser., vol. 16, 1904, pp. 279-282a. 



