910 



J. PEESTWICH ON THE RANGE OF THE LOWER 



Fig. 4. — Probable Section between Kentish Town and Oxford Street. 



N. TEIAL WELL. S. 



a. Gravel. 



b. Clay. 



c. Lower Tertiaries. 



d. Chalk. 



d'. Chalk marl. 



e. Upper Grreensand. 



/. G-ault. 



g. Lower Greensand. 



h. Devonian. 



Fig. 5. — Diagram Section from the North Downs to London. 



';■/.■/; JJMil.-i.ii 



1. Tertiary strata. 4. Lower Greensand. 8. Carboniferous strata. 



2. Chalk. 5. Wealden. 9. Upper! ^ , , 



3. Gault. 6. Jurassic strata. 10. Lower | DeVOnlan strata ' 



a. Kentish-Town Well. b. Tottenham-Court-Road Well. 



