complete series 

 from the Chalk to 

 the post-Glacial 

 gravels. I have 

 mapped a con- 

 siderable portion 

 of the valley on 

 the scale of t> 

 inches to the 

 mile ; and this 

 work, together 

 with the very- 

 large number of 

 excellent sec- 

 tions exposed in 

 the valley, has 

 brought out 

 many interesting 

 points. Almost 

 any part of the 

 valley might be 

 chosen, but a sec- 

 tion across it near 

 Bramford 1 or Ips- 

 wich (see fig. 1) 

 is fairly typical. 

 Here, within a 

 small area, pits 

 can be examined 

 where the Boul- 

 der Clay is seen 

 resting on Chalk, 

 Lower London 

 Tertiaries, Lon- 

 don Clay, or Gla- 

 cial Sands and 

 Gravels. The 



Boulder Clay 

 forms the plateau-, 

 land of Suffolk 

 from 100 to 400 

 feet O.D., but 

 here in the valley 

 it is found at 30 

 to 40 feet O.D. 

 (Ipswich railway- 

 cutting, Sprough- 

 ton, and Bram- 

 ford). The man- 

 ner in which the 



1 Boswell, 1912 

 (33) p. 235 & map, 

 pi. xxxiv. 



