504 THE DEVONIAN PERIOD. 



gray hard shale and arenaceous shale [Cordaite shales in Feet, 

 part) ; buff and gray sandstone [Dadoxylon sandstone) and 

 flags. Many fossil plants ; Crustaceans and Spirorbis . 2800 



4. Bloomsbury Group. — Reddish conglomerate, with slaty paste 



and rounded pebbles ; trappean or tufaceous rocks ; red, 

 purplish, and green sandstones and shales. Thickness 

 variable ...... 2500 



Lower Silurian System. 



5. Black papyraceous shale, with layers of cone-in-cone concre- 



tions ....... 400 



6. Hard, generally coarse and micaceous, gray shales and flags, 



of various shades of colour, and with some reddish shale 

 and tufaceous or trappean matter at the bottom. Lingular, 

 burrows, and trails of animals. Also in certain beds, 

 Paradoxides, Conocephalites, and other primordial Trilo- 

 bites ..... 3000 feet or more 



The following details as to the several members of the Devonian are 

 abridged from Professor Bailey's and Mr Matthew's excellent memoirs 

 already referred to. Before giving these, I may explain that the 

 several members of the Devonian system form, on the east side of St 

 John Harbour, a trough or synclinal form, and that from the eastern 

 extremity of this some of the members of the series are believed to 

 extend for a great distance to the eastward, in a more or less meta- 

 morphosed state. The general arrangement is shown in the section, 

 Fig. 178. 



Mispeck Group. 



" The deposits of this group, constituting the newest member of the 

 Upper Devonian series, occupy, in comparison with the groups to be 

 described, a very limited area. So far as certainly known, they may 

 be said to be confined within the narrow district intervening between 

 the Little and Mispeck Rivers, and consequently occupying the centre 

 of the trough already pointed out, as formed by the folding of the Upper 

 Devonian groups. 



" They rest immediately upon the beds of the Cordaite shales, and 

 so nearly resemble the latter as to be not easily distinguished. It is 

 therefore not unlikely that the group may yet be found to have a 

 wider distribution, especially westward of the St John River, in the 

 peninsula of Pisarinco. 



The following descriptive remarks taken from the paper of Mr 

 Matthew well represent its general character. 



