[matthew] CAMBRIAN FORMATION IN EASTERN CANADA 79 



followed by darker gray shales (Paradoxides beds). These form 

 Division I of the St. John group. By increasing sandstone seams 

 and coarser shales or slates, all of a gray color, this part becomes the 

 massive strata of Division 2 (Paradoxides — Olenus). 



At the top these flags fine away and become by alternation of 

 finer slate and the disappearance of the flags, the fine shales of Division 

 3, much of which is of quite a dark colour, owing to the abundant 

 remains of Hydroid animals (Graptolites &c). 



CAPE BRETON CAMBRIAN. 



A quite similar succession is found in Cape Breton, where, how- 

 ever, the dark gray shales of the Paradoxides beds are not in evi- 

 dence, but the change is from modified volcanic effusions to coarse 

 slates with sandstones, followed by fine grained pale gray shales, and 

 these by a great body of flags and sandstones that fully represent 

 in physical characters the strata of Division 2 of the St. John group. 

 These are well displayed along the shores of the Barachois harbor 

 and the line of the Intercolonial Railway. 



At the head of the above named harbor and up the valley of 

 McLeod brook, the finer rocks of Division 3 come in and are rec- 

 ognized in the Dictyonema shales and similar fine strata containing 

 a fauna equivalent to the Tremadoc fauna of Wales. The almost 

 completely parallel physical history notable in the Cambro-Ordovician 

 basins of southern New Brunswick and eastern Nova Scotia, though 

 those basins are separated by hundreds of miles of strata of different 

 age, is sometimes remarkable and testifies to the uniformity of phys- 

 sical changes over large areas in Cambrian time. 



NEWFOUNDLAND CAMBRIAN. 



Passing eastward to Newfoundland a somewhat similar series 

 of events may be traced by changes in the composition and succession 

 of the sediments. The Cambrian rocks there are in most cases based 

 on what the late Sir A. Murray called the ."Intermediate" series, 

 and while showing three faunas in a series of beds equivalent to the 

 division of the St. John Group does not have above them as large a 

 body of sandstones as are found in Division 2 at St. John. At 

 Conception Bay in Newfoundland much of this division is under water, 

 but at Trinity Bay, farther north, the passage to the upper division 

 is more clearly seen and there is less diversity in the character of the 

 sediments than at St. John, N.B. As at St. John and in Cape Breton, 

 so here also in Newfoundland, the uppermost measures of the ter- 



