PEEFACE. 



The subject proposed fur the Sedgwick Essay in 1876 was 

 "The Post-tertiary deposits of Cambridgeshire and their relations 

 to deposits of the same period in the rest of East Anglia." 



Circumstances have prevented the earlier publication of this 

 Essay, to which the prize was awarded ; but the delay has 

 enabled me to make a few additions to the original manuscript, 

 such supplemental matter being indicated by the use of square 

 brackets in the teit. With the exception of this and of the 

 concluding remarks, the Essay is now printed in the same form 

 in which it was sent to the Adjudicators of the prize. , 



I am indebted to the Director of the Geological Survey 

 of England for permission to make use of the information 

 obtained during the survey of that part of Cambridgeshire 

 on which I was engaged at the time the Essay was written. 

 My thanks are also due to my colleagues, Mr W. H. Penning 

 and Mr S. B. J. Skertchly, for the notes relating to other 

 parts of the county which they placed at my disposal. 



A. J. JUKES-BROWNE. 



5 West Hill, Highgate, 

 ■July, 1878. 



