[matthew] CAMBRIAN FORMATION IN EASTERN CANADA 85 



which becomes common in the upper Etcheminian, and extends on 

 upwards through the lower Paradoxides beds. Was it a migrant from 

 some other Palaeozoic shore, or did it originate at this time? 



The little Leptobolus which appeared in the Coldbrook terrane, 

 also becomes plentiful and varied in the upper Etcheminian fauna; 

 it was one of those type better fitted to quieter conditions of de- 

 position than prevailed when the lower Etcheminian beds were 

 deposited. 



Sec. IV, 1914—7 



