XV111 PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. 



Fig. Page 



10. [Microscope-sections.] Marloesite and pantellerite 198 



11. [Microscope-sections.] Olivine-basalts of Skomer 203 



12. [Microscope-sections.] Ophitic dolerites of Skomer 206 



13. Diagram illustrating the percentage chemical composition of 



the Skomer igneous rocks . . 209 



1. Section through Wandale Hill 224 



2 & 3. Cyrtograptus rigidus Tullb 235 



4. Monograptus wandalensis, sip. nov 235 



1 . Map of Egypt, showing the distribution of the ' gravels ' con- 



taining igneous rocks derived from the Red-Sea Hills 243 



2. Sand with ' dreikanter,' from the sandy gravel-plains north of 



the Gulf of Jemsa 246 



3. Foraminiferal sand, southern shore of South Gaysum Island... 247 



4. Geological sketch-map of part of the Red-Sea area 255 



— Teeth of Dipriodon valdensis, sp. nov 279 



— Side view and view from above of Dorypyge laJcei, sp. nov. ... 291 



— Section of the Bristol Lower Coal-Measures, from the Ashton 



Great Vein to the Bedminster Great Vein 318 



1. Map of Burrington Combe and the immediate neighbourhood 34 



2. Section in the bed of the eastern twin stream [Burrington 



Combe] 350 



3. Hillside between Quarries 1 & 2 and the upper part of Quarry 2 



[Burrington Combe] 354 



4 Froui the hillside exposure of S 2 , past Quarry 2 and Plumley's 



Den to ' The Cave ' [Burrington Combe] 355 



5. S x and C 2 beds, from Quarry 2 to near Quarry 3 [Burrington 



Combe] 356 



6. The base of C 2 , the dolomites of Quarry 3, and the top of C 1 y 



[Burrington Combe] 357 



7. View reversed, looking northwards [Burrington Combe] 358 



8. The great scarp of C x y [Burrington Combe] 359 



9. Valley of the western twin-stream and the great scarp beyond 

 "Burrington Combe] 360 



diey 



it[: 



10. Looking up the valley of the western twin-stream [Burring- 



ton Combe] 361 



11. Contoured plan of one of the characteristic tabulae of Caninia 



patula, Mich 375 



12. [Vertical sections.] The relation of Burrington to other 



Carboniferous Limestone districts 386 



