REPORT OF THE DIRECTOR I9II 



119 



ous rock as well as of the volcanics, and it becomes very evi- 

 dent to the observer that the igneous masses have been exposed 

 in their surface contours by meteoric solution of the gypsum 

 overburden. That this is the process of removal of the gypseous 

 rock is made clear by its presence in the shore sections of masses, 

 interstitial between the laccolitic volcanics in cliffs which equal 

 in height the volcanic domes themselves ; and for this reason I 

 am disposed to believe that the progress of time will bring the 

 volcanic domes into even stronger topographic contrasts. It is to 

 be presumed that the intrusive masses are not all at the same horizon 

 in the rocks and that the interstices or intervals between as well as 

 for the most part the surface over them is occupied by the gypseous 

 masses. This part of Entry does not however show certain other 

 accompanying and contact effects of the laccolites which are shown 



Curved vol3ani^ layers in a section of a demoiselle, east coast of Entry island 



in the rest of the islands. These I have elsewhere referred to and 

 they have chiefly to do with the relations of the laccolites to the 

 gray sandstones which are best displayed on Grindstone and Alright 

 islands. On Amherst island it is made very clear that the red 

 sandstones are of later date than the gray, for they lie unconform- 

 ably over them. But on Grindstone island the red sandstones pass 

 laterally into the gray and much harder sandstones of Point au 

 ]\leule, the steamer landing at that place. Point au Meule is a 

 demoiselle exposing no igneous core ; the gray sandstones alone 

 compose the sea cliff which rises wxU nigh to the top of the dome. 

 This hardened and highly silicious sandstone mass is soon replaced 

 by the gypsums at the north as it is by the red sandstones at the 

 south. Similar phenomena are seen in the shore domes on Alright, 

 the bolder heads displaying gray sandstone fronts, and in these 



