3i6 



WALCOTT 



Stratigraphically this shale occupies the position of the Pro- 

 tolenus beds of the Hanford Brook section of New Brunswick. 

 The next stratum above is formed of two layers of impure, 



o; 





•n 



J3 en 



O k 



s-^ 







Orthis. 



Olenus Zone. 



Paradoxides Zone. 



Protolenus Zone. 



\ Olenellus Zone. 



:i;w^■';'5ig,-'v:^'-w^<l gneiss. 



P'iG. lo. Diagrammatic vertical sec- 

 tion of the Cambrian formations on 

 Manuels Brook. 



earthy, pinkish-colored limestone, separated 

 by lo inches of greenish shale. In the lime- 

 stone numerous fragments of Paradoxides 

 occur. This limestone is the base of the 

 great Paradoxides zone, and corresponds in 

 position to a similar limestone in the Smith 

 Sound section. 



base of the green shales. At the time this section 

 was measured the cliffs and banks were heavily 

 wooded, and I now think that the shales found in the 

 outcrop higher up the slope were beneath the con- 

 glomerate limestone. A comparison also shows differ- 

 ences in the measured thickness of the beds, which 

 arise largely from the better opportunity offered for 

 measuring this section in 1899, owing to the fresh ex- 

 posures made by the landslides, resulting from the 

 clearing off of the timber. 



