OEGANISMS IN ACADIA. 



137 



those very ancient rocks, previously known to have only worm burrows. By the 

 organic remains which they contain, consisting of brachiopods, crustaceans, etc., he 

 was able, on palœontologieal grounds, to divide the obscure slates of the lowest 

 Cambrian at St. Davids into the vSolva group (upper) and the Caerfai (lower). The 

 upper group has a thickness of 1,800 feet, and by its fauna corresponds with that of 

 Baud c of Division 1 of the St. John group. But the thickness of the Solva group is 

 such that its lower measures may correspond to Baud b in the St. John as well. This 

 being the case, it is probable that the Caerfai group may represent the lower or basal 

 series of Cambrian rocks in Acadia. 



Norway, Britain, Newfoundland, and the eastern provinces of Canada, afford unusual 

 facilities for the stiidy of the Cambrian system, and in the following table an attempt has 

 been made to correlate, the older members of this system, which are found in the coun- 

 tries mentioned : — 



It may be remarked that the Basal series in Acadia, though unconformable to the St. 

 John group, is closely related to it in its distribution. It has at its base a conglomerate, 

 which rests in some places on the diorites, agglomerates, etc., of the Coldbrook group and 



' These are inserted as an estimate based on ]\Ir. AValcott's observations in Newfoundland, in American Jour. 

 of ScL, July, 1889. 



Sec. IV, 1889. 18. 



