122 
measures 11.5 feet ; and about half-way across the hill it appears 
to divide into two nearly equal dikes, which are separately 
numbered (47 and 48). Near the point of bifureation, which is, 
unfortunately, concealed, a much smaller branch (49) starts 
from the north side and can be traced across to the western cliff. 
The similar small dike (50) just south of 46, on the western 
shore of Granite Plateau is probably also a branch of this main, 
parent dike. Parallel with 46 on the south is 51, which can 
be traced for about the same distance across Great Hill, crossing 
the boundary fault between the conglomerate and the granite 
without sensible displacement. The most southerly dike on 
Granite Plateau (52) is, perhaps, a continuation of 51. It is 
first seen about half-way across the plateau and ean be followed 
to the western shore of Weir River Bay, crossing and probably 
cutting 38 under the water. 
Hast- West Dikes South of Weir River. 
| Width 
No. Trend, Hade. | in Remarks. 
| | feet. 
58 N. 809 E. N. 59-100 | 1 In granite west of railroad. 
54 N. 809 E. N. 592405 8 N incl b: t 
55 INNO E “№. 109-159 | 8.5 M " w n “ 
OO | N. 80“ E. Ny 109 4? б, iH Ae Fk fe 
N 80° E. | " " east A 
58 N. 80° E N. 300-400 10-15? | “ n V NE n 
59 | 8.809 E N. 350 4 T " west '' "T 
00 | 8, 85° E N 20У T " y. mre " 
61 | E.-W. S, 15 2.5 ti (dy east <“ p 
No special or systematic search has been made for dikes 
among the granite ledges south of Weir River Bay; and the 
few that were casually observed have been noted chiefly to 
render the special map more uniform and complete, and not 
on account of their intrinsic interest. It should be understood, 
however, that these outlying non-sedimentary arcas of the map 
have not been uniformly treated in this respect, and un- 
doubtedly many dikes have been overlooked, especially west of 
