70 THE ROYAL SOCIETY OF CANADA 



other on opposite sides of the basin for twenty miles or more, or until 

 they are lost on the one hand beneath post Cambrian strata and on 

 the other beneath Devono-Carboniferous strata. Dr. L. W. Bailey, 

 who spent a season in the study of these eruptions, considered that 

 those of the southern range of hills had originally been piled up to a 

 height of one or two miles. There is an intimate relation between 

 them and the overlying red sediments on both sides of the basin. No- 

 where have we found a conglomerate at the base of this terrane but 

 usually amygdaloids or breccias, spread over a weathered land 

 surface. 



In New Brunswick no fauna has been found at the bottom of this 

 terrane, for it has not there any marine accumulations; but in Cape 

 Breton beds of shale have been found intercalated with the effusive 

 rocks at the base of the Palaeozoic column in that island, from 

 which a few species of Brachiopod and Ostracods have been taken. 

 The known species are the following: — 



Acrothyra signata m. prima. 

 Acrotreta papillata m. prima 

 Leptobolus torrentis. 

 Lingulella cf longovalis. 

 Lingulepis pumila. 

 Escasona ( ? ?) ingens. \ 



Indiana ovalis m. prima. / 



This limited list of seven species presents a series of forms which 

 is so much like that of the fauna in the next terrane above that it can- 

 not be regarded as a wide departure from known Etcheminian types, 

 all of the genera except one of the Ostracods being such as are found 

 in the terrane above. Nevertheless they are of interest to the natur- 

 alist as showing the most ancient types of animals recognized in the 

 Palaeozoic rocks of the Maritime provinces of Canada. 



ETCHEMINIAN TERRANE. 



On a previous page when speaking of the red sediments that rest 

 upon the volcanic rocks of the St. John basin, no allusion was made 

 to other basins of Cambrian rocks to the north of the St. John basin. 

 There are two of these. That of the Kennebecasis which is next the 

 St. John basin, does not show the great bulk of measures found in the 

 St. John basin, perhaps partly because important areas are now sub- 

 merged beneath the waters of Kennebecasis Bay and its branches. 

 In this Cambrian basin both the volcanic rocks and the overlying 

 red sediments are entirely wanting, and the lowest beds exposed are 

 the basal members of the St. John group itself, which a little above 



Brachiopods. 



Ostracods. 



