ON SECTIONS or MOUNTAIN-LIMESTONE CORALS. 



41 



Section of the Boring at Kentish Town. 



.0 

 CO 



CO 

 CI 



g 



r 



^ 



London clay 

 (236 ft.) 



Woolwich 

 and Heading 



series 

 (61 ft. 6 in.) 



Thanot sands 

 (27 ft.) 



CD 

 OO 



S 



O 



I 



Lower chalk 



without flints 



(294 ft.) 



Chalk-Hiarl 

 (47 ft. 6 in.) 



tapper 



Greensaud 



(72 ft. 6 in.) 



Gault 

 (ISO ft. 6 in.) ■ 



Depth. 



ft. in. 

 273 6 



Middle chalk 



with flints 

 (244 ft. 6 in.) 



307 

 324 



ft. in. 



1. Yellow clay 30 6 



2. Blue clay, with Scjttaria 205 6 



3. Mottled (red, yellow, and blue) clay 37 6 



4. White sand, with flint-pebbles 6 



5. Black sands ; passi7ig into 2 



6. Mottled gi-een and red clay 1 



7. Clayey sands 3 



8. Dark grey sands with seams of clay 9 6 



9. Quicksands, ash-coloured 6 6 



0. Flint pebbles 1 6 



1. Ash-coloured sands 10 



3. Argillaceous sands 4 



3. Dark-grey clayey sands 11 



1. Bed of angular green -coated flints 2 



' 15. Chalk with flints 119 6 



16. Hard chalk without flints 8 



17. Chalk, less hard, with few flinfs 31 6 



IS. Nodular chalk, with three beds of ta- 

 bular flints 13 6 



19. Chalk, with seams of tabular flint and 



a few nodular flints 32 6 



20. Chalk, with a few flints and some 



patches of sand 9 



,21. Very light-grey chalk, with a few flints 30 



22. Light-grey chalk, with a few thin beds 



of chalk-marl subordinate 133 



23. Grey chalk-marl, with compact and 



marly beds and occasional pyrites ... IGl 



24. Grey marl 20 



25. Harder grey marl, rather sandy, and 



■with occasional iron-pyrites 27 



26. Hard rocky marl Q 6 



27. Bluish-grey marl, rather sandy; the 



lower part more argillaceous ' 58 9 



28. Dark-green sand, mixed with grey clay.. 13 9 



29. Bluish-grey micaceous clay, slightly 



.sandy .' SQ q 



30. Ditto, with two seams of argillaceous 



greensand (j 7 



31. Micaceous blue clay 84 11 1113 C 



483 6 



529 6 



Second Report of the Committee appointed to get cut and prepared 

 Sections of Mo-untain-Limestone Corals for Photographing. The 

 Committee consists of Henry Woodward, F.G.S., Prof. Duncan 

 F.n.S., Prof. Harkness, F.R.S., and James Thomson, F.G.S. ' 



In presenting to the Association the second Report on the slicing of corals 

 from the Mountain Limestone, for the purpose of showing their structural 

 characteristics by means of photography, we have to state that considerable 

 progress has been made during the year, but much still remains to be done 



