REPORT OF TEE CEIEF ASTRONOMER ' 227 



SESSIONAL PAPER No. 25a 



elusions published in 1905 and 1906 as a result of a study of the ' Moyie Sill ' 

 are essentially strengthened by the new facts of structure. Gravitative differ- 

 entiation is illustrated not once but thrice, that is, in each of the sills occurring 

 on the western slope of the mountain. It is illustrated a fourth time in the 

 more important of the two sills on the eastern slope. 



Figure lb. Locality map of the Moyie sills, showing in solid black 

 the parts best exposed. The straight line in the middle of 

 the map represents the Boundary line ; the other straight 

 lines represent the approximate outcrops of major faults. The 

 block between the faults includes Moyie mountain. Contour 

 interval is 500 feet. Scale, 1 : 68,000. 



For convenience, the five sills of Moyie mountain will be distinguished 

 by the letters, A, B, C, D, and E, named in stratigraphic order, with A the 

 highest, E the lowest in the series. (See Figures 13, 14 and 15). Of these sills, 

 C, D, and E correspond to the whole ' Moyie sill ' of the 1905 and 1906 papers. 



Of the five sills, B is the only one with a sensibly homogeneous composi- 

 tion. Each of the other four presents phasal variations of notable character. 



25a — vol. ii — 15| 



