76 THE ROYAL SOCIETY OF CANADA 



bers of the Cambrian in this valley and those of the St. John Basin, 

 but in cases where the comparison is possible we are struck by the 

 remarkable discordance in the faunas that characterize the two basins 

 at points not more than three miles apart. The age of the fauna at 

 Hastings Cove is fixed by the dark shales in the upper part of the 

 measures seen at this cove which contain the Abenacus subfauna. 

 To the south of this cove rises a high hill of pre-Cambrian limestones, 

 against which the oldest of the Cambrian beds rest. These contact beds 

 contain numerous pebbles of the limestone and more of the associated 

 granitic rocks of the hill, and point to the derivation of much of the 

 material of the Cambrian beds from the adjoining Pre-Cambrian 

 rocks; they tell us that these granitic rocks were extruded before the 

 Cambrian age. 



When we come to investigate the fossils of these contact beds 

 of the Cambrian, which are below dark shales holding P. Abenacus, 

 we are surprised at the heterogeneous collection of species which they 

 contain. The zoological standing of this fauna is discussed in the 

 Bulletin of the Natural History Society of New Brunswick, Vol. IV, 

 p. 40; but in brief it may be said that it contains genera which else- 

 where are referred to the Olenellus, the lower Paradoxides and the 

 upper Paradoxides zones; on the whole the genera of the fauna in- 

 dicates that it should be placed at the top of the Lower Paradoxides 

 zone; yet we see that this fauna underlies fine shales that contain 

 P. Abenacus (cf. Tessini) CIA. 



The difference of this Hasting's Cove fauna from the typical 

 fauna of the P. Abenacus subzone seems most easily explicable on the 

 basis of a difference of environment; in the one locality a steep and 

 rocky coast-line, in the other a muddy sheltered bay. The contact 

 of the Hastings Cove strata with the pre-Cambrian rocks of the 

 adjoining hillside is due to transgression, as there are older parts of 

 the St. John group in other parts of the Kennebecasis Valley. 



In the St. John basin the P. Abenacus shales are found to be of 

 uniform texture and composition at both ends of that basin and to 

 carry a similar fauna, which, however, is best shown at the eastern 

 end of the basin. Here there is quite a varied group of species, the 

 most abundant and the most typical being various forms of trilo- 

 bites, Pychoparinae which appear in the lower subzones, especially 

 that of P. Eteminicus, here become abundant and varied, while the 

 Concoryphinae on the contrary are represented only by examples of 

 Ct. Matthewi. Agnosti and Microdisci abound, and in the former 

 genus most of the subgeneric forms are present, while the latter is 

 reduced to the one form represented by the M. pulchellus of Hartt. 



