in East Anglia in Tertiary Times. 



201 



strike therefore changes in an area north-east of the zonal deflexion. 

 The statement has been made that there is a thinning in the Lower and 

 Middle Chalk over the possible axis in Suffolk. The writer is unable 

 to find any evidence for such attenuation. There is. however, an 

 important change in the gradient of the sub-Eocene Chalk surface in 

 South-East Suffolk. This is indicated by the way in which the 

 contours crowd up both south-west and north-east of the critical area. 

 Some figures may be quoted : Beccles to Lowestoft, 55 feet to the 

 mile; Halesworth to Southwold, 27ft.; Ipswich to Walton-on- 

 Naze, lift.; Hadleigh to Weeley or Clacton, 17ft.; Thaxted 



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