Correspondence, 



39 



the upper Drift dropped into the middle Drift, of which the cliff is 

 composed, and the whole capped unconformably by Post-glacial 

 gravel. The Brickfield at the north end of the low cliff on which 

 Soiithwold stands (Sheet 49) shews a series of Post-glacial sands, 

 interstratified with white marl contain- 

 ing freshwater shells, resting on the 

 upper Drifts, and with that Drift 

 thrown into an angle of more than 

 45° with the horizon. At Eockland 

 Staithe, 6i miles E.S.E. of Norwich 

 Castle, the beds intervening between 

 the Crag and middle Drift are faulted ; 

 but it requires a familiarity with the 

 beds, or a description which the com- 

 pass of a letter will not allow, before 

 the extent of the fault could be shewn. 

 A pit in the S.E. corner of Sheet 66, 

 one mile and six furlongs N.N.E. of 

 Beccles church, and two hundred yards 

 above the fine exposure of the Chilles- 

 ford beds, shews (unless now worked 

 out) Post-glacial gravel faulted into the 

 sand of the middle Drift, and standing 

 like a wall against it for several feet. 



These throws affect the Drift; but 

 more important than these, because 

 affecting beds much newer than the 

 Drifts, are those which occur in the 

 Post-glacial series. One of these is 

 shewn by Messrs. Topley and Foster, 

 in their paper on the Medway gravels ; 

 two others were given by me in the 

 papers, in your Magazine, on the 

 Thames and East Essex gravels ; one 

 of them being at Bradwell-on-Sea, and 

 the other in Wickham Lane, near 

 Woolwich ; the latter is very accessible 

 to your London readers, and is just now 

 well exposed by a three-sided projection 

 which shews the stratification very 

 finely and that it is not due to the 

 oblique bedding, as well as the amount 

 of the dip, 18° to 20°, directly towards 

 the fault which brings up the Chalk 

 face on the opposite side of the lane.^ 

 Lastly, there is that at Higham shewn 

 by me in the sections in your numbers for February and March 

 last.^ This is the most important of all, because it affects a 



^ There are two brickfields in the lane, this is in the nearest to Wickham church. 

 2 Geol. Mag. Vol. III. pp. 67 and 99. 



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