:X PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. 



Page 



Fig. 1. Loess concretions. Warren-House Gill 178 



2. Diagram of part of the Durham Coast at Warren-House 



Gill 180 



3. Diagram of part of the Durham Coast opposite Black- 



hall Colliery 182 



4. Cyrtodaria siliqua Spengler 195 



1. Plan of Cambridge and neighbourhood 205 



2. Sections in the south-western face of the South Pit, 



Traveller's Rest 212 



3. Worked flake, blue and buff, with facetted platform 216 



Figs. 4 & 5. Blue-black coup-de-poing and grey flake 217 



6 & 7. 'Borer' (grey flint) and mahogany-brown flake 218 



Fig. 8. Indigo-coloured flake 222 



9. ' Tea-cosy ' shaped implement 223 



10. Milk-blue nucleiform grattoir 224 



11. Section in the well on Downing Site 225 



— Map and section of the rift-valley at Asmari Mountain . 246 



1. Sections illustrating the constitution and thickness of the 



Millstone Grit Series in the Northern Midlands 278 



2. Map showing the probable distribution of land and water 



in the Millstone Grit Period 280 



3. Diagram illustrating courses of distributary streams in a 



great river-delta 284 



