
242 STRUCTURAL AND FIELD GEOLOGY 
and fissures is at once determined. As crustal movements 
have often affected the same area at different periods, and 
not infrequently in different 
directions, new systems of 
divergent and _ intersecting 
folds and fissures have suc- 
cessively been produced, the 
relative age of which can 
usually be ascertained by 
observing the behaviour of 
one system to another. 
Branching and Intersec- 
tion of Lodes.—Lodes not 
infrequently divide into two 
or more branches, which, after 
Gi pursuing separate courses for 
Fig, tea eee AND longer or shorter distances, 
again come together (see Fig. 
92). Occasionally, also, two lodes may gradually converge 
until they meet, and then, after running side by side for some 


FIG. 93.—LODES CONVERGING AND DIVERGING. 
little way, may again diverge (see Fig. 93); or, instead of 
diverging, one may intersect the other without displacing 
or shifting it, and subsequently resume its original direction 

