﻿PUOCESS-BLOCKS A^D OTHEE ILLUSTRATIYE PIGUHES, 

 BESIDES THOSE IN THE PLATES. 



Fig. Page 



1. [Flint-implement from Gaddesden Eow, Hemel Hempstead.] , 2 



2. [Flint-implement from Ellingbam's Pit, Leverstoek Green, 



Hemel Hempstead.] 4 



1. Map of the Hitchin Yalley 9 



2. Section across the Hitchin and Stevenage Gap , 10 



3. Section through the Langley-Ippolitts Valley 14 



4. Section through the Hitchin Valley 16 



1. Sketch-map showing the outcrop of the Carboniferous Lime- 



stone in the Midland Area 35 



2. Vertical section of the typical Carboniferous - Limestone 



sequence in that area 39 



3. Section from Litton Tunnel to Millers-Dale lime-works 40 



4. Diagrammatic section of Newton-Grange cutting 60 



5. Section in a quari-y near Old Mill, east of Youlgreave 62 



6. Median longitudinal section of Chonctes comjyrcssa 78 



1. Schizoneura sp. /3 87 



2. Schizoneura a fricana,YQ\^imsi\)Xe\ 89 



3. Pinnules of Thinvfeldia odontopteroides and Ptilozamiies 91 



4. Thinnfeldia odo'tiiopteroides 93 



5. BancBopsis Hiighesi, Feistmantel 96 



0. Tceniopteris Carruthersi, Ten. Woods 99 



7. Sir obil it es laxus, s]i. no\ 103 



