550 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [JUUC 20, 



The perpendicular lines in the diagram indicate the sections afforded at the 

 following places : — 



1. That by numerous pits south-west of Margarettmg, in Essex. 



2. That by Margaretting railway-cutting and by pits in the Chelmer valley 



above Chelmsford. 



3. That by the railway-cuttings and by pits between Chelmsford and Marks Tey. 



N.B. h is unavoidably represented too thin in the above localities. 



4. That by the cuttings near Colchester. 



5. That by the cuttings of the Tendring Hundred Railway, between Colchester 



and Thorington. 



6. That by Frinton Cliff, near Walton-on-the-Naze ; h remains here in patches of 



only a few feei in tliickness, capped by a warp containing fragments of i. 



7. That by Walton-on-the-Waze Cliff. The beds e' here overlap the Crag and 



rest on the London Clay to the south, but not at the north end of the 

 cliff; e occurs in a few faint patches only, and the shells are too decayed 

 for extraction. 



8. That by Bawdsey Cliff. 



9. That by a pit immediately on the Sutton side of the Woodbridge ferry, and 



by a pit a furlong south of Ferry farmhouse, Sutton. In the former pit 

 the beds e' are slipped from their place, and are marked by a clump of 

 trees growing on them, but in the latter are in situ. 



10. That by the pit at Wilford Bridge over the Deben, and by numerous pits in 



Ufford adjoining. The Crag is found by digging in the Wilford-Bridge 

 pit. (The vertical line 10 should have been drawn only into the upper 

 part of d^.) 



11. That by the Coprolite workings of Sutton, Shottisham, Foxall, Newbourn, 



and Brightwell. 



12. That by the pits at Butley, near the Abbey, and near the Oyster Inn. 



13. That by the pit behind, and by that below Chillesford church. N.B. The 



Boulder-clay (i) has, by a down-throw, been slid obliquely on to e' in 

 the former pit ; but i and h may be seen in their true relation in a pit 

 distant one furlong N.N.W. i may also be seen faulted down beside d^^ 

 and ^^' in a pit (marked " Sand pi f in the Ordnance map) by the river, 

 9 furlongs E.S.E. of Chillesford church. 



14. That by a pit 7 furlongs N.E. by N. of Sudbourn church. 



15. That by several pits in Iken and in parts of Sudbourn from 2 to 3 miles 



N. and N.E. of Sudboui-n church. N.B. By reason of the tortuous 

 boundary afforded by the ridge of Coralline Crag rock to the bay in which 

 the Eed Crag was accumulated, the Eed Crag reenters the district, as a 

 spit, near Section 14, and does so again in small dimensions at Aid- 

 borough. This is not shown in the diagram. 



16. That by the clay-pit 5 furlongs, and by the (Thorpe) crag-pit one mile 



E.N.E. of Aldringham church, and by the sand-pits and railway-cutting 

 south of the crag-pit. 



17. That by the country between the clay-pit and the v^est side of Aldringham 



Green. 



18. That by Dunwich Cliffs. N.B. g^ is represented in these cliffs by a dark- 



orange sand which comes up in the southern part of the cliff-section ; h is 

 very thick hei'e (about 50 feet), i occurs for a few yards only, and imme- 

 diately north of the ruins. There is also a deep bed of post-glacial gravel 

 under the ruins, and a later post-glacial yellow loam, as well as a black 

 warp over all. 



19. That by Southwold Cliff. The cliff is too obscure to show whether the sand 



forming much of it is h, or is post-glacial ; but at the north end (at the 

 kiln) i, together with thick post-glacial beds capping it, and containing 

 fresliwater shells, has been thrown nearly into the vertical. 



20. That by the clay-pit 2 furlongs east, and the crag-pit 4 furlongs nortli-east, 



of Henham-Park farm ; and by various sand-pits along the Blyth valley. 

 N.B. i may be seen faulted down beside d^' and d^' in a pit by the farm- 

 house 3 furlongs E.S.E. of Bulchamp Workhouse, and the same distance 

 N.N.E. of the Bulchamp crag-pit. A pit of oblique-bedded rounded 

 pebbles occurs close to the 101 milestone, E. of Henham Hall, and another 



