2 D GEOLOGICAL SURVEY OF CANADA. 



Subdivisions of aud felsite, the former often chloritic or talcose, and described in 



Pre-Cambrian. former reports ag pro togine. 



2. An upper portion comprising also syenite and gneiss, with 

 quartzite, felsite and limestone, mica and felsite schists and black 

 graphitic slates. These two divisions form what has in earlier reports 

 been regarded as constituting the Laurentian area of the southern 

 portion of the province. 



3. Eed, grey and blackish petrosilex and felsite, with breccia con- 

 glomerates, diorites, amygdaloidal ash rocks and felspathic conglome- 

 rates, with grey felspathic sandstones, constituting tbe Coldbrook 

 division of the Huronian of previous reports. 



4. Chloritic, felspathic and talcose schist, often a schistose conglo- 

 merate, interstratified with beds of purple ash rock and amygdaloid, 

 and purple conglomerate and clay slate, with pale grey and pyritous, 

 rusty-weathering felsite and felspathic quartzite. 



These constitute the Coastal division of the Huronian of former 

 reports. 



5. Eeddish and grey felsite, often hard and flinty, felspathic and 

 chloritic schist, with diorite, hornblende schist and granitoid and 

 gneissic rocks, with heavy beds of slate conglomerate and felsite 

 conglomerate and clay slate in the upj>er portion. 



These constitute the Kingston division of the Huronian of former 

 reports. 

 Division 2, Of the relations of Division 2 of the above series (mica schist, lime- 



stone and fine gneiss) to the main body of coarse syenite and syenitic 

 gneiss (Division 1), nothing further is known than is contained 

 in the report of 1870-71, wherein they are described as the "upper 

 series of the Laurentian area." The greatly broken and disturbed 

 character of this supposed " upper " series, the obscure stratification 

 of much of the underlying group, together with the frequent occur- 

 rence of intrusive masses, combine to make the determination of its 

 position difficult. There can, however, be no question that the bulk of 

 the calcareous and silicious strata met with in this area are more recent 

 than the coarse granitoid rocks with which they are associated, while 

 both are at many points seen to pass beneath the Cambrian or Primor- 

 dial Silurian. Their principal mass forms a long, irregularly lenticular 

 belt extending from the vicinity of South Bay on the west side of the 

 St. John Eiver, across this stream and through the parish of Portland 

 through and beyond Torryburn, while a second but narrower belt 

 skirts the southern edge of the Laurentian area, appearing on either 

 side of Musquash Harbor, crossing the peninsula of Pisarinco and 

 reappearing near the suspension bridge of the St. John Eiver. At 

 Lily Lake, near St. John, the limestones of this latter belt pass beneath 



