PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. 



Fig. Page 



27. Sketch of the head ridge of the previous figure, looking E. ... 327 



28. Sketch of the N.W. spur of Snowdon, looking S.E. from 



Moel-y-Cynghorion 328 



29. Cross-profiles of a normal mature valley and of a glaciated 



valley 334 



■30. Sketch of crags near the head of Afon GwarfaiValley, looking E. 336 



31. Sketch of rugged cliffs under Cwm Dyli, looking N. from near 



Lake Gwynant 337 



32. Sketch of the Craig-y-Bere, on the S. side of Mynydd-mawr, 



looking N.E. from a cwm S. of Nantlle Valley 338 



1. Map of the South Island of New Zealand, showing the distri- 



bution of the magnesian rocks 352 



2. Diagrammatic section across the peridotite-belt, Aniseed Valley 356 



3. Diagrammatic section across the peridotite-belt, Dun Mountain 356 



1. Section of the Lahat ' pipe,' looking N.N.E 384 



2. Section of the same, looking E. S.E 385 



-3. Photograph of a specimen from the Lahat ' pipe,' preserved in 



the British Museum (Natural History) 386 



4. Diagrammatic sketch of another specimen from the Lahat 



'pipe' 387 



1. Map of the neighbourhood of the Victoria Falls 391 



2. Section in a basalt-quarry near the Maramba River 392 



-3. Gravel cliff at drift, Maramba River 398 



1. The Luano Valley seen from the Matakula Pass, looking E.N.E. 410 



2. Map of the W. Luano Valley 412 



-3. Map of part of N.W. Rhodesia 416 



4. Section across the Luano Valley 417 



5. Section showing the descent to the Danda Flats 417 



■6. Section showing the folding of the Karroo strata on the N. 



margin of the Zambesi Basin 431 



7. Sketch-map of the Malembi Valley, Lufua R 432 



1. Geological map of the neighbourhood of Seaford 444 



2. Section from Denton to Bishopstone 448 



-3. Section from Hobb's Hawth to the Ouse Valley at Foxholes ... 448 



4. Section from Seaford Head to Hindover 450 



5. Section from Chyngton to Exceat New Barn 452 



<6. Diagram illustrating the fault in the Cuckmere Valley 453 



