Woodworth.— Joints. 
PLATE 3. 
Pig. 1. Fracture system of the east Asian volcanoes. The heavy curved line 
is drawn through the vents of the groups named. The straight lines 
represent the partly volcanic ridges of Corea, the island of Saghalien, 
and the upper Kamtscliatkan peninsula, corresponding to the 
oblique b-planes of fracture. The long curved lines correspond to 
the curved lateral cross-fractures in the jointing system. Cf. with 
Plate 2, figs. 4, 9, 10. 
Fig. 2. Fracture system of the Hawaiian Islands. The circles represent 
volcanic craters as mapped by Dana and W. T. Brigham, bb, 
supposed b-plane type of fractures; cc, cross-fractures (straight 
medials). Cf. with Plate 2, fig. 12. K, Kea range of volcanoes; L 
Loa range of volcanoes. 
