part 1] ANNIVERSARY ADDRESS OE THE PRESIDENT. XCV 



2. The Jurassic rocks of the rest of England have had a similar 

 history, and show an analogous structure, modified by unequal 

 uplift. 



3. The Triassic and most of the Carboniferous rocks of England 

 appear also to have been accumulated in deepening troughs or 

 basins, which were afterwards shallowed by differential uplift where 

 the deposits were thickest. 



4. Where the formations dealt with lie above sea-level, the 

 present outcrops represent the areas of maximum development, and 

 therefore coincide roughly with the position of the deepest parts of 

 the old troughs. This factor may be of wide application, and has 

 a practical bearing. 



