REPORT OF THE DIRECTOR IQII II7 



sometimes as erect dikes of diabase, deeply rotted and at others 

 thin single sills lying at steep angles and constituting the projecting 

 points of the rocky shore. In the midst of these volcanic-gypsum 

 masses, however, are well-stratified green and gray sandstones, ex- 

 posed most plentifully nearer the contact with the soft red sandstones 

 at the southwest of the area; and in the very heart of the gypsum 

 clays I have located in the 'midst of great disorder of the strata, 

 dolomites and shales carrying fossils of the same species as those 

 which have been described from Grindstone island. The combina- 

 tion of rOcks here is not unlike that on Grindstone island, and else- 

 where in the archipelago, but it is more forcibly expressed. The 

 gray sandstones prevail in greater extent on Grindstone and Amherst, 

 and on the former the fossiliferous rocks are found in close juxta- 

 position to the gypsum. There is on Entry no such development of 

 the commercial gypsum as on Grindstone but the same disordered 

 condition of the gypseous clays and the same intimate association of 

 these with volcanic intrusions. This volcanic-gypsum area is the 

 foreland of the distinctively volcanic demoiselle range of hills; 

 its volcanic intrusions are not conspicuously dome-shaped, but 

 isolated single dikes or sills with no contact effects except those 

 indicated by the existence of the gypseous masses. Here, as on 

 Grindstone, there are many evidences of angular diabase blocks 

 entirely inclosed in gypsum, forming a diabase conglomerate with 

 crystalline gypsum cement. The dislocations of the sandstones and 

 limestones are purely local and of slight extent. It is quite evident 

 that for the red sandstones the horizontal position general in all 

 the other islands is normal here, though these are somewhat out of 

 place on the west shore ; and likewise the gray sandstones, elsewhere 

 horizontal, are here thrown into a steep dip where they appear on 

 the south. The disorder of arrangement shown in the cliff sections 

 of this belt is expressed by the irregularities of the surface of the 

 ground. 



The demoiselles. This belt of breasted hills begins at the 

 north, forms all the eastern third of the island, spreading a little 

 westward at the south. The most impressive and largest are at the 

 north but it is toward the south that the number is greatest. In a 

 certain sense they are arranged in a single row close against the 

 sea and into their substance the sea has eaten its way, but at the 

 south lesser hills spring up about the base of the larger, becoming 

 smaller in size as they recede from the main series, but always in 

 this more diminutive form retaining their perfect symmetry. I 



