[BAILEY] GEOLOGICAL CORRELATIONS IN NEW BRUNSWICK 149 
yielded no fossils, probably represents the black graptolitic strata of 
Benton. 
Finally it is to be observed that along the northern side of the 
great granite axis which in York county separates the two great slaty 
belts referred to in the introduction of this paper, we have in the parish 
of Canterbury what is probably a repetition of the beds described as 
occurring about Woodstock and to the southwest of the latter; granitoid 
grits, green and purple slates, amygdaloids, etc., occurring in the one as 
in the other, and being similarly associated with massive quartzites and 
gray slates. It is in the synclinal trough between these two great con- 
verging belts of Cambrian or older rocks, with their associated erup- 
tives, that we find the comparatively narrow belt of fossiliferous Silurian 
slates discovered by Mr. Wilson, and in connection with which are con- 
glomerates filled with fragments from the older series. 
Compared with the Cambrian rocks of St. John county, the black 
Dictyonema slates correspond to the Bretonian Division of the St. John 
Group as established by Matthew, while the quartzites and slates repre- 
sent the Johannian division of the same group. The only true Cambro- 
Silurian or Ordovician strata are those of the Beccaguimic valley, and 
these, representing the Lower Ordovician, are exposed only over a very 
limited area. 
If we now pass to the second great belt of slaty rocks in central 
New Brunswick, viz., that lying south of the great central granite 
axis, we find new light forthcoming here also, but in the direction of 
indicating a more recent rather than a more ancient horizon for these 
strata than had previously been entertained. 
As in the case of the Carleton county beds, the necessity for a 
change of view arises from the discovery of fossils. Up to the time 
ct the presentation of this paper the only organic remains observed 
were certain obscure forms, resembling Dictyophyta, found by Mr. W. 
T. H. Reed, in the slates of Spring Hill brook, five miles northwest of 
Fredericton, and the collections made by Chas. Robb and others in the 
Nashwaak valley. Both of these tended to indicate Silurian horizons, 
the latter even approximating to Devonian, yet the great bulk of the 
strata, consisting of quartzites and slates, were still regarded and 
represented as Cambro-Silurian. Quite recently, however, the writer 
has been fortunate in finding the latter beds also to be not only fossil- 
iferous but Silurian, the fossils consisting mainly of graptolites of the 
genus Monograptus. From their occurrence at two widely separated 
localities (Murray’s brook, seven miles northwest of Frederiction, and 
the shore of the St. John river, opposite the mouth of its tributary, 
the Mactaquac), and the almost unvarying character of the strata over 
