PR0CESS-I5L0CKS AND OTHER ILLUSTRATIVE PIGURES. 



Pages 

 356, 365, 371, 



Figs. 1, 3, 4, 5, 6, 7, 8, 1 Maps illustrating the glaeiation J 376, 384, 406, 



10 & 11, 12, 13. J of North -East era Ireland I 



[ 420 



408, 416, 419, 



Page 

 Fig. 2. Capture of the Owencam Hiver by an overflow-channel 



from the lake in Glenmakeeran 362 



9. Section in the sea-cliff at the mouth of the river below 



Riverstown 414 



— Map illustrating linear foliation and minor folding in the 



Schichallion district 440 



1. Map of the younger plutonic rocks of the North-East of 



Scotland " 447 



2. Map and section of the Arnage Mass, Aberdeenshire 452 



3. Microscope-sections of norite 455 



4. Microscope-sections of ' contaminated ' rocks 462 



5. Geological map of the Ardlethen district 468 



6. Microscope-sections of xenoliths 476 



1. Map of part of the Berwyn Hills 488 



2. G eological sketch-map of Aber Marchnant 493 



3. Geological sketch-map of the Blaen-y-cwm Valley 496 



4. Section at the head of the first tributary on the south 



side of the Marchnant Valley 499 



1. Vertical section through the Ordovician rocks of Corris 



and Aberl 1 ef enn i 514 



2. Diagrammatic section along Foel Crochan, north of 



Aberllefenni. 522 



3. General section from Mjnycld y Waun to Nant 



Llwydiarth '. 526 



4. Diagrammatic sketch of the Gorris Anticline, as seen at 



Braich-goch 532 



5. Sketch-map illustrating the general geological structure 



of the area between Corris and Machynlleth 534 



6. Comparative sections illustrating the relation of the 



sequence north-east of Aberllefenni with that at 

 Plynli m on 538 



1. Map illustrating distribution of samples from the 



St. Austell Granite 548 



2. Map illustrat ing distribution of quartz 548 



3. Curves showing the effect of sampling by slides from 



granite, Dyer's Quarry, Meledor 550 



