and Phcenomena of the County of Suffolk. 371 



The surface of the chalk dips under West Street, 20 feet in'70 yards, or 

 1 in lOf feet to the north. In 70 yards also, the London clay deepens from 

 9 to 70 feet; and the plastic clay shallows from 40 feet to 18, The 8th bed 

 of No. 6. appears to be the second of No. 7., and if so there are only 10 feet 

 difference in level. 



No. 8. Arnold's Well, East Bergholt. 



Ft. In. 



1 . Diluvium — gravel 3 



2. loam, gravel and sand 11 



3. clay 4 



4. sand (Spring) 



Total.. 14 4 



This well gives an average of the surface soil in that parish ; and the depth 

 of 14 to 18 feet furnishes a nearly constant supply of water. 



No. 9. Well at the Rectory, East Bergholt. 



Feet. Feet. 



1. Diluvium — earth 2 



2. red gravel 4 



— G 



3. London clay — yellow clay, growing darker 20 



4. blue clay (with selenite) 97 



— 117 



5. Plastic clay — black gravel 3 



6. Chalk 50 



7. Upper green sand — greenish sand and blackish earth 4 



Total.. 180 



N.B. The height of the surface is about 110 feet above the level of the 

 salt-water bed at Cattawade*; the chalk consequently falls about 48 feet to 

 Harwich, eastwardly. The plastic clay shallows also in that space from 

 18 to 3 feet; and the London clay deepens from 9 to 117 feet. It will be 

 also seen that the general depth from the top of the cliff at Harwich to the 

 chalk there, agrees within a few feet of the depth at Bergholt to the chalk, 

 and within a quarter of a mile from the well No. 8., and within a few rods of 

 No. 9. the crag appears in a very thin stratum. 



* Catiwade? {Cati vadum) head of the Stour estuary at Brantham, near Bergholt. See Tacit. 

 Annal. XIV. 32. 



VOL. V. — SECOND SERIES. 3 C 



