1911—12.] 
VOL. XXXII. 
Report on Rock Specimens. 
273 
A B 
0/25456 INCHES 
U-L-J-J , 1 1 | » I , 1 1 I 
rrrrn 1 < 1 ' 1 ■ 1 
G 40 80 120 160 MM, 
Fig. 3. — Explanation as in text fig. 1. 
0 12 3 4 5 6 INCHES 
1 . i . i ■ i . i ■ i i i i i 
o'"' 4V ~80 120 Too MM 
Fig. 4. — Explanation as in text fig. 1. 
18 
