370 THE GEOLOGICAL HISTORY OF THE 
panying Plate VII, Fig. 1, in which the horizontal and vertical 
distances are represented on the same scale of two inches to one 
mile. 
The most striking feature of this section is the repetition of 
geological formations. The red Triassic sandstone of the margin 
of the Basin is underlaid by the shales and sandstones of the 
Horton series, which are in turn underlaid at the summit of the 
ridge by slates. Upon the corresponding slope on the opposite 
side of the valley, shales and sandstones are again underlaid by 
slates. The red sandstone is not found in the Gaspereau Valley 
along the line of the section. 
Several interpretations of the underlying structure are 
suggested by the surface indications. The beds are all water- 
formed, and all dip to the northern quadrant of the compass, so 
that the first and simplest explanation is-that they form 
successively deposited series, as shown in Fig. 2, the southern- 
most slate older than and succeeded unconformably by the 
southern series of sandstone and shale, this dipping beneath and 
therefore older than the slates of the Wolfville ridge, and these 
again unconformably overlaid by the Wolfville sandstone and 
shale series, and these again by the calcareous red sandstones of 
the Cornwallis Valley. 
A brief study of the rocks, however, reveals the fact that the 
sandstone and shale formations of both slopes are alike, not only 
in mineralogical composition but also in fossil contents, and that 
they are merely geographically separated parts of the same for- 
mation. If further reasons for rejecting this explanation were 
necessary, the slates also possess similar characteristics, and we 
know of no way in which the clay-slates of the Wolfville ridge 
could have been cleaved and altered while the sedimentary beds 
beneath, often as fine in texture, remained unchanged. 
A second explanation is that the rocks appearing at the sur- 
face are the northern limbs respectively of two anticlines, as 
shown in Fig. 3, the joining limb being concealed by the thick 
surface deposits of the lower slopes of the north side and bottom 
of the Gaspereau Valley. 
