PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. X.111 



Fig. Page 



4. Section from Barras Nose through Trevena Valley 270 



5. TintageJ Island, seen from the S.E 274 



6. Barras Nose, seen from the S.W 276 



1 . D ia gram of two cycles of erosion in Devon 202 



2. Diagram of normal subdued mountains 204 



3. Diagram of a cwm in a subdued mountain, based on a sketch 



of Cwm Du in Mynydd-nuuvr, looking southwards 296- 



4. Diagram of a young main valley, with normal hanging lateral 



valleys 200 



5. Diagram of a mature main valley, with accordant lateral valleys 200 



6. Diagram of the pre-Glacial features of the Snowdon mass 307 



7. Diagram of the present features of the Snowdon mass 308 



8. Diagram of protective glaciers in the valleys of a subdued 



mountain 308 



9. Diagram of the effects of normal erosion on the previous figure 308 



10. Successive profiles of a protective glacier 309 



11. Diagram showing an extension of the glaciers of fig. 9 310 



12. Diagram showing the effects of normal erosion on the previous 



310 



13. Diagram showing the origin of hanging lateral valleys under 



protective glaciers 312 



14. Diagram of a large eroding glacier in the valleys of a subdued 



mountain 313 



15. Diagram of a young main glacial trough, with hanging lateral 



glaciers 314 



16. Diagram of a mature main glacial trough, with accordant 



lateral glaciers 314 



17. Diagram of a later stage of fig. 14 316 



18 & 19. Diagrams of successively later stages of the same figure 316 



20. Diagram showing the forms revealed by the disappearance of 



a protective glacier 317 



21. Diagram showing the forms revealed by the disappearance of 



a mature eroding glacier 317 



22. Sketch of Crib-goch, looking N.E. from Snowdon summit 324 



23. Sketch of Lliwedd, looking S.E. from Snowdon summit 324 



24 & 25. Diagrams illustrating the origin of the summit of Snowdon, 



on the theory of protective and of eroding glaciers 324 



26. Sketch of a cwm on the S. side of Nanttle Yalley 327 



