150 
HUGHES : INGLEBOROUGH. 
even to some extent creeping up between the harder strata ; 
while new minerals are formed between the two walls of the fault 
only in the lenticular open spaces where the more soUd strata 
hold the opposing sides apart, as shown in Fig. 8. Hence in 
such a case we have galena, for instance, occurring along the lod& 
in such a place as that indicated by the * in Fig. 7, whereas in 
the intermediate stages the fault is entirely closed and no ore is. 
found. 
