368 THE GEOLOGICAL HISTORY OF THE 



hill, until we come to massive beds of coarse irregularly bedded 

 sandstone with sub-angular quartz grains powdery cementing 

 matter and all the conspicuous features of the sandstones form- 

 ing the basal members of the Horton series before described. 



In the Duncan Brook the sandstones finally change, rather 

 abruptly, in character, a soft reddish-brown substance appearing 

 and making up a larger and larger portion of the rock, until it 

 passes at a well-defined boundary, into a soft argillaceous rock 

 with bright ribbon-like bands of coloring where the edges of 

 highly inclined green, brown and drab layers have been smoothed 

 and rounded by the stream. This rock is evidently the source 

 of the soft brown constituent of the immediately over-lying 

 sandstones, and furnishes certain proof that they are newer than 

 and laid down upon these argillaceous beds. 



Cleavage is not well-marked in these underlying clay rocks 

 at this point, but the bedding is plainly shown by the color 

 banding and by the occurence of occasional gritty layers. The 

 dip at the contact is to the southeast, but in passing up the 

 brook the beds gradually become vertical and then dip to the 

 northwest, suggesting an overturn. The rocks also change 

 gradually to compact bluish slates with well-deffned cleavage. 



The succession in the next brook to the east is the same, but 

 the contact of the two formations is concealed by loose material 

 in the bed of the brook. The argillaceous color-banded beds 

 are well exposed, dipping to the southeast at an angle of 45 

 degrees. Dr. Ami has found Dictyonema Websteri in these beds 

 and considers them as of Silurian age.* Farther south, these are 

 succeeded by blue slates, as in the Duncan Brook. 



The topographic features of the region have been stated to 

 be due in part to the characteristics of the underlying geological 

 formations, in part to structural phenomena subsequent to the 

 deposition, and independent of the characteristics of these rocks. 



Wolfville rests at the junction of the slate with the overlying 

 sandstone. From the town this junction extends eastwardly, 

 ascending the ridge obliquely to the crest, where it suddenly 



"Summary Report of the Geol. Surv. of Canada for year 1893. Pp. 180-182 



