I 



PROCESS-BLOCKS AND OTHEE ILLUSTRATIVE FIGURES. XIX 



Fig. Page 



7. Torsion-system of the Groden Pass 578 



8. Diagram illustrating the torsion-movements at the Groden Pass. 581 



Q /Cliff-exposure in the southern face of Cherz Hill, towards 

 ^'\ Varda 584 



, ^ / Parallel sections from Monte Sief and Cherz Hill to the 

 ^^•[ Buchenstein Valley 586 



11. Faults in the fold-form of the Buchenstein Valley 586 



12. Fold-form of the Buchenstein Valley and Sett Sass 586 



13. Scheme of torsion-faults in the Buchenstein Valley 588 



14. 1 6. Tran STcrse sections through the Sella Massive 592, 594 



15.17. Fold-forms of the Sella Massive 592,594 



18. Infold of Jurassic rocks (Boe summit) 606 



19. Diagram of torsion at the Boe summit 607 



20. The Sella folds, before and after torsion 609 



21 . Contour sketch-map of the Enneberg district 614 



22. 



Map showing strike-torsion in the peri-Adriatic area of 

 subsidence . . . . , 630 



1. Eastern side of Porth yr Ebol 645 



2. Sketch-map of the north-western corner of Anglesey 646 



3. Section at Ogof Gynfor, near Llanbadrig 648 



^ f Contorted green phyllites : part of rock-face in quarry behind 

 *| E-ectory, Llanfair-y'nghornwy 651 



5. Section in quartz-knob, Llanbadrig Point 653 



n r Porth Newydd : small horizontal faults in the cliff north of 

 *\ the Ordovician boundary .., 654 



„ r Disrupted grit-courses in Ordovician black shales, Porth 

 ''1 Newydd 666 



8. Section north-west of the pier, Cemaes 658 



Q r Section through the crush-conglomerate on the coast, Penrhyn, 

 ^•\ Cemaes 660 



r Rock-face on Penrhyn, near Cemaes, showing relics of strati- 



\ fication in the crush-conglomerate 662 



10. 



n.{ 



South-eastern corner of Cemaes Bay : parts of broken quartzite- 

 bands 664 



12. Quarry on the east side of Craig Wen, looking north 671 



-J o f Purple band in cleaved grits and conglomerates, on the coast 

 * \ west of Porth Llanlliana 673 



,_o {Eucladia Woodwardi, sp. nov. — Reconstruction, dorsal and 

 *\ ventral aspects 694 



