122 ROYAL SOCIELY OF CANADA 



member in which gneiss and syenite are also found, but which also em- 

 braces a considerable thickness of quartzite, crystalline limestone, and 

 mica schist, which in many points resemble the strata usually described 

 under the term " Grenville series " in the province of Quebec. In this 

 o-roup were also included at one time certain bands of black graphitic 

 slates, found at the suspension bridge near the city of St. John, which 

 have however, recently, been found to contain fossils (Graptolites) similar 

 to those found in the Levis slates, and which are consequently now refer- 

 able to the base of the Cambro-Silurian system. 



The rocks of the Huronian system in this province have been 

 divided into three groups, viz., the Coldbrook, Coastal and the Kingston. 

 The former comprises a considerable thickness of felsitic rocks, red, gray 

 and blackish coloured, with breccias and ash a-ocks, felspathic sandstones 

 and diorites. The Coastal consists largely of chloritic, felspathic and talc- 

 ose schists, in places with a conglomerate structure, along with purple 

 ash-rocks, conglomerates and clay slates, and with rusty-weathering fel- 

 sites and felspathic quartzites. The Kingston consists principally of fel- 

 sitic and schistose rocks with diorites, granitoid and gneissic strata, and 

 heavy beds of slate conglomerate, and with some clay slate in ihe upper 

 portion. Some of the beds in this division are hornblendic. 



It is to be presumed that a large portion of the rocks which make 

 up the mass of the several divisions of the Huronian are of igneous 

 orio-in. The presence of conglomerates, slates and limestones at a num- 

 ber of places, however, shows that a portion of the series is clearly of 

 sedimentary origin ; and while the relations of the several divisions to 

 •each other are not always quit« clear, they aie as a whole, doubtless, 

 newer than the gneisses and limestones which compose the division re- 

 garded as upper Laurentian. In character this division presents a 

 marked resemblance in the slaty conglomerate and blue slaty limestones 

 to the members of the Hastings series, west of the Kingston and Pembroke 

 railway, in Ontario, while in the schistose and slaty character of much of 

 the Coastal and other rocks of the Huronian divisions, there is a strong 

 resemblance to the strata found in the Sutton mountain anticlinal in 

 eastern Quebec, and which may be presumably regarded as the equiva- 

 lents of the New Brunswick rocks in point of age. 



The three divisions of the Huronian in this province underlie the 

 lowest Cambrian there known, and are therefore intermediate between 

 the rocks of this system and the Laurentian limestone and quartzite 

 series. Like the rocks of eastern Quebec, they have usually been de- 

 scribed in the official reports simply as Pre Cambrian. 



The Archœan rocks of eastern Nova Scotia, where these are more 

 particularly developed, resemble very closely those of southern New 

 Brunswick as well as of certain portions of the areas in Quebec and 

 Ontario. To the west of the Strait of Canso, in the counties of Antigon- 



