and Phenomena of the County of Suffolk. 369 



Plastic Clay, Nos. 1, Q, 7, 9, 13, 16, 17, 18? 29, 37? 38, 40, 42 to 46, 48, 



49, 50 ? 55, 59, 60, Q5, 67 ? 72, 75, 89, 95, 97. 

 Chalk, Nos. 6, 7, 9, 18, 20, 21 to 23, 25, 51, 59 to 65, 68 to 71, 74, 76, 95. 

 Green Sand, Nos. 9, 51. 



No. 1. Well at Halstead, Essex. 



Feet. 



1 . London clay — loam 20 



2. Plastic clay — gravel 6 



3. sand 5 



4. silt or sand 3 



Total.. 34 



Water instantly rose. 



No. 2. Well at Weeley barracks, 

 Essex. 



Feet. 



1. Diluvial gravel 20 



2. London clay, with septaria .. 126 

 Sand 



Total.. 146 

 Water rose instantly, and stands 50 

 feet deep. 



No. 3. Wells about half way down East Hill, Colchester. 



Feet. 



1. Diluvial gravel and earth .... 16 



2. London clay 66 



Sand 



Total.. 82 



Water instantly rushed up and stands 15 feet deep, increased to 25 by land 

 springs in wet seasons. This agrees with the well at the Barrack ground, 

 which is 108 feet deep (Conybeare and Phillips's Outlines, p. 33.), the levels 

 of the surface according. 



No. 4. Well about 1^ miles from Ardleigh towards Colchester, and nearly 

 level with the kiln yard. 



Feet, 



1 . London clay, red 20 



2. do. blue, containing oysters at the depth of 103 feet. . .. 90 

 Sand 



Total.. 110 



The water stands 20 feet deep. 

 No. 5. Section of the escarpment of the Barrack Cliff, Harwich, 1829. 



Feet. 



1 . Crag — red gravel and sand 



2. crag shells in fragments 



3. Upper London clay — mottled clay, white reddish and grey clays 



bluish-grey and blue clay J 



Carried forward . . 20 



