Vlll PROCESS-BLOCKS AND OTHER ILLUSTRATIYE FIGURES. 



Page 



Fig. 17. Section of the south-eastern corner of 'Railway' Pit, 



adjacent to Gi-ovebury Brickworks 33 



18. Section in tlie trencli at the east, side of Long Crendon 



Windmill Pit 43 



1. Map showing secondary folding of nappes 84 



2. Clough's criterion of .south-eastward movement during 



• pre-auticlinal ' times in Cowal 90 



3. ^lap illustrating the metamorphism of nappes 92 



4. Map illustrating the two great fo'ds of the Iltay Nappe . 102 



5. Diagrammatic secrion illustrating the geological contrasts 



north-west and south-east of Dalniallj ]0i> 



6. Geological map of Loch Creran and Ardmucknish Bay... 110 



7. Geological map of Loch Etive, Pass of Brander. and 



Loch Awe ; 13 



8. Geological map of Glen Orchy and Ben Lui 122 



1. Section from Bula to Moel-fryu 136 



2. Section up Bryn-cut 142 



3. Diagrammatic sketch, of y-Garnedd Quarry-face 147 



4. Vertical section of Long Quarry-face, Moel-fryn 151 



Figs. 5-7. A'ertical sections showing the variation in the Gelli-grin 



Calcareous Ash 154 



Fig. 8. Sketch-section showing the Hirnant Beds and tjieir rela- 

 tion to the Silurian 15G 



9. Section from Creigiau Bychain to Bryn-pig 158 



10. Diagrammatic sketches of Orfhis hirnantenHts. and Stropho- 



mcna dhiriana 1 65 



1. Outline-map showing the chief tectonic features of tlie 



Llangollen district 178 



2. Plan and section of the Bryn locality 184 



3. Section showing the variation and thickness in the Bala 



formation, Northern Berwyns 185 



4. Geological map of Caer Drewyn 216 



5. Geological map of the country near Llandegln 220 



1. Sketch-map of the peninsulas of the Eoss of Mull and 



Ardmeanach 230 



Figs. 2 k 3. Sections of the xenolithic composite sill, Rudh' a' Chro- 



main 234 



