PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. XV 



Fig. Pagk 

 Well-section near Biggleswade 376 



Map of the Bajocian Denudation, showing the area of the 

 different beds upon which the Upper Trigonia-Qrrit was 

 deposited 382 



Step-fault, 30 yards north-east of Offa's Dyke, Sedbury Cliff... 392 



Diagram showing the ranges of fossils through the lowest beds 

 of the Lower Lias at Sedbury Cliff. 400 



1 & 2. Heterastrcea rhcetica, sp. nov 404 



1. Crystals of epidote and sphene, with granules of ilrnenite, in a 



groimdmass of chlorite and actinolite-fiakes 415 



2. Crystals of epidote, enclosing allanite and embayed by calcite... 416 



3. Rock from Bossiney Haven 418 



4. Crystals of epidote (enclosing allanite) and biotite, contained in 



a chloritic 'base' 419 



5. Phyllite containing clinochlore 423 



(Table IV) Diagram of the strata from Bredon Hill to Standish 450 



Diagram of an exposure at May-sur-Orne (Calvados) 455 



