40 BULLETIN OF THE NATURAL HISTORY SOCIETY. 



It is evident that the deposits in the middle basin (Kennebecasis 

 valley) were much thinner than those of the southern (St. John) 

 basin. This is shown by the small narrow strips of sediments of 

 which the Cambrian here is composed, and by the absence of the 

 upper division (Bretonian), which, being of fine soft shale, would be 

 easily removed by denudation. The middle division (•Tohannian), 

 which in the southern basin shows a thickness of 1,000 feet, is here 

 so reduced as to show only a tithe of this thickness. The Paradoxides 

 beds, though not well exposed, also seem much thinner than in the 

 southern basin, and only the Protolenus beds, by their volume and 

 texture, fully bear out the aspect of their counterpart in the southern 

 basin. 



It would appear, then, that while a great part of the Cambrian 

 series is present in this valley, it is very much reduced in thickness ■ 

 from this it may be inferred that the floor of the Cambrian sea was 

 sinking in the area of the southern basin much more rapidly than in 

 the middle basin, and for most of the time was being filled up with 

 sedimentary deposits as fast as it sank. 



Faunas. — An interesting discovery in the Kennebecasis valley 

 was that of the fauna of Hasting's Cove, which is a sub-fauna of the 

 Paradoxides beds. Hitherto we had not found in the Acadian Cam- 

 brian rocks anything to correspond to the Upper Paradoxides beds of 

 Sweden, the sub-faunas found in the southern (St. John) basin being 

 such as are paralleled by the Lower Paradoxides beds of that country. 

 At Hasting's Cove, however, we came across some genera not before 

 found in this region, and which recalled the facies of the Swedish 

 Upper Paradoxides beds, these were Anomocare and Dolichometopus ; 

 and associated with them was the easily recognized genus Dorypyge, 

 found in the Middle Cambrian of western America and of China. 

 By this sub-fauna we can link the upper part of our Paradoxides beds 

 with the corresponding rocks in Sweden, West America and China. 



Another interesting discovery made in this valley was finding 

 of a type of trilobite in company with Agnostus pisiformis, L., which 

 showed peculiar phases of development. In this type were contained 

 two species which, so far as the headshields arc concerned, could not 

 in the earliest stages lie distinguished from each other. They first 

 become separable by their pygidia, which in one species takes the 

 form of Olenus and in the other that of Anomocare. It would thus 

 appear that from the one phylum or stem form two genera were 

 developed. (See the opposite pag 



