MR CADELL ON EXPERIMENTAL RESEARCHES IN MOUNTAIN BUILDING. 357 



9. The more rigid the rock the better will the phenomenon of thrusting be exhibited. 



1 0. Fan structure may be produced by the continued compression of a simple anticline. 



1 1 . Thrust-planes have a strong tendency to originate at the sides of the fan. 



12. The same movement which produces the fan renders its core schistose. 



13. The theory of a uniformly contracting substratum explains the cleavage often found 

 in the deeper parts of a mountain system, the upper portion of which is simply plicated. 



14. This theory may also explain the origin of fan structure, thrusting, and its 

 accompanying phenomena, including wedge structure. 



25 FE 



VOL. XXXV. PART 7 3 N 



