DAWSON ON THE GEOLOGY OF NOVA SCOTIA. 



27 



Section I. 

 Tatmagouche to Truro, 24 miles. 



, N. Tatmagouche. 



New Annan Hills. 



Pictou Trough. 



Truro. S. 



c a b d 



d. Horizontal red sandstone. 



c. Red and grey sandstones and shale, with concretionary limestone, con- 

 taining copper ore, lignite, Endogenites, and footmarks of birds • dip near the hills, 

 30° ; at Tatmagouche only 10°. 



b. Sandstone and coal — coal-plants. 



a. Limestone, dark slate, 'shale, and grits, with shells and encrinites — In- 

 truding bands of granite, syenite, amygdaloid, &c. 



Fundy, To the eastward it does not reach the coast of Nor- 

 thumberland Strait, though its underground continuation in that 

 direction is indicated by an Anticlinal line which traverses the 

 newer members of the coal formation that lap round the eastern 

 extremity of the Annan Hills. 



These trough-shaped arrangements of the strata are subject to 

 many irregularities. The hilly region of Mount Thorn is placed 

 nearly transverse to the Pictou trough. In consequence of the 

 separating ridges and anticlinal lines having been elevated, either 

 during the carboniferous period, or at a still later epoch, the car- 

 boniferous strata are traversed by numerous faults and minor lines 

 of disturbance, the prevailing direction of which is from east to 

 west. In spite of these disturbances, however, the strata in the 

 troughs have a general synclinal arrangement which can be traced 

 in the hilly regions, such as that of Mount Thorn. This will be 

 seen by examining the accompanying map. 



East River. 



N. 



River. 



Pictou Trough. 



Section II. The gypsiferous formation ap- 



Valley of the eastern branch of East pears in several places on the south 



side of the Pictou coal trough. In 

 s , noticing its appearance at these 

 points, I may begin by stating some 

 facts respecting the section on the 

 ■3 East River of Pictou in addition 

 to those already described by Mr. 

 Lyell. The members of the gyp- 

 siferous formation seen in that sec- 

 tion consist of hard, brownish-red 

 shales and sandstones (c), with beds 

 of marine limestone and masses of 

 gypsum (b). These latter are seen in the valley of the river between 

 the sandstones and the Silurian strata (a) ; but there are no good 



c. Hard sandstone. 



b. Gypsiferous formation, with beds 

 of limestone and gypsum alternating, 

 and drifts overlying. 



a. Silurian slate. 



