166 ROYAL SOCIETY OF CANADA 



metopus, îind Centrojaleiira (Anopolinus ?) and of (.ertain species of 

 Agnosti. 



The new sub-fauna of the St. John Group has all these chai*acter- 

 istics, except the j^resence of Centropleura. In place of this genus with 

 its spined pygidium, we have another which also has a spined pygidium, 

 viz., Dorypyge. This genus was first defined by W. Dames, who found 

 it in a collection of trilobites from China. He found Anomocara to 

 abound with it, and decided for this reason and others that the rock in 

 which it occurs was of the age of the Andrarum limestone of Sweden. 

 These indications point to the conclusion that the rocks which contain 

 the new sub-fauna on the Kennebecasis Eiver are of the age of the 

 " Upper " Paradoxides beds in the north of Europe. 



î^urther, it is important to observe that the new sub-fauna contains 

 genera, and even species of the Olenellus Fauna of America, which are 

 absent from the other Paradoxides sub-faunas of the St. John group. 

 Thus, either from similarity of environment, or actual chronological 

 approachment, or other cause, this sub-fauna is more like the fauna of 

 Olenellus than any other hitherto found in Northeastern America. 

 This leads one to suspect that the Olenellus Fauaa is not of such great 

 antiquity as of late years it has been thought to be. 



Description of the Measures. 



The Cambrian measures at Hastings Cove form a narrow strip of 

 sediment, raised to a vertical position, resting on their south side against 

 a precipitous hill of Laurentian rocks, and passing on the north beneath 

 the waters of Kennebecasis Bay. The Laurentian rock immediately ad- 

 joining is a quartz-diorite, of which a narrow dyke forms the first brow 

 of the hill, but which is overtopped by a great mass of limestones, which, 

 with some slates and quartzites, form a geological basin of about a mile 

 and a half in width in the older Laurentian rocks. The quartz-diorite 

 is similar to other intrusive masses in the Laurentian area which have 

 been studied by Dr. W. Y>. Matthew, and which b}' their contact etïects 

 are shown to be more recent than the limestones. But as these quartz- 

 diorites are intruded only in Laurentian rocks (including the limestones), 

 it is judged that they are Pre-Cambrian. 



This hypothesis is supported also by the fact that the Cambrian I'ocks 

 at Hastings Cove contain conglomerate bands (interraned conglomer- 

 ates), among whose pebbles well rounded tVagments of quartz-diorite are 

 found, and less frequently pieces of the Laurentian limestones. The con- 

 glomerate bands are usually calcareous, the pebbles being buried in a 

 calcareous paste, and in this paste most of the species described in this 

 paper were found. 



Associated with the pebbles and limestone paste are scattered masses 

 of phosphate of lime irregularly distributed ; this substance is also a 



