269 



following table is a condensed form of one published by 

 Matthew [2, p. 69]. 







Equivalents in Great Britain. 



Ordovician. 



Bretonian. 



Llandeilo. 

 Arenig. 





Tremadoc. 

 Dolgelly. 



Cambrian. 



Johannian. 



Maenterog. 

 Ffestiniog. 





Menevian. 





Acadian. 





Solva. 



Basal 

 Cambrian. 



Etcheminian. 

 Coldbrookian. 



Caerfai 

 Pebidian. 



The Coldbrookian is described by Matthew as essentially 

 composed of volcanic rocks comprising flows and tuffs. 

 In places it is found lying unconformably upon the Pre- 

 Cambrian with a coarse conglomerate at the base. At one 

 locality only, are fossils described as occurring in the 

 Coldbrookian. At this locality, on Dugald brook, about 

 20 miles (32 km.) southwest of George River station, the 

 Coldbrookian is only 315 feet (96 m.) thick. The lower 

 portion is of feldspathic sandstones with layers of conglom- 

 erate. The upper portion consists of amygdaloids and 

 felsites. Above these occur members of the Etcheminian 

 division. The fossiliferous strata lie midway in the section 

 and are about 30 feet (9.1 m.) thick. Six species of brach- 

 iopods and two of ostracods are described by Matthew 

 [2, p. 72]. The two ostracods occur also in the overlying 

 Etcheminian accompanied by brachiopods very similiar to 

 those found in the Coldbrookian. 



The typical region for the Coldbrookian series is in south- 

 western New Brunswick, where, so far as is known, the 



