64 Dr Marr, Submergence and cjlacial climates (luring the 



Submergence and glacial climates daring the accumulation of 

 the Cambridgeshire Pleistocene Dejwsits. By J. E. Marr, Sc.D., 

 F.R.S, St John's College. 



[Read 5 February 1917.] 



A. Introductory. 



The sequence of events during palaeolithic times is still a 

 subject surrounded by much uncertainty. The area of the Great 

 Ouse Basin is one in which considerable light has already been 

 thrown on vexed questions, and as the examination of the area is 

 carried out in greater detail, important results will be obtained, 

 for in this area we get evidence of the relationship of the palaeo- 

 lithic deposits to those which were formed during a period of 

 submergence and re-emergence, and also to accumulations which 

 give evidence of the occurrence of more than one cold period. 



The general distribution of the palaeolithic deposits of the 

 district around Cambridge, and their main characters, have long 

 been known, and an account of the deposits, with references to 

 the previous literature, is given in the Geological Survey Memoir 

 The Geology of the Neighbourhood of Gambridqe, published in 

 1881. 



Since that memoir appeared, further light has been thrown 

 on the deposits, especially by Professor Hughes, who has given his 

 latest views in a paper entitled Tlie Gravels of East Anglia 

 (Cambridge University Press, 1916). 



I have devoted much attention to this subject during the last 

 six years and hope to describe my detailed results elsewhere. 

 The present paper is concerned with a discussion of the main 

 problems involved, in hopes that it may direct the attention of 

 workers to the importance of further observations, for the deposits 

 with which we are concerned are only exposed temporarily during 

 the_ working of gravel-pits and the digging of foundations and 

 drains, and it is desirable that all temporary excavations should 

 be carefully studied, and the objects obtained rendered available 

 for study by deposit in Museums, for isolated specimens in private 

 collections are usually mere objects of curiosity devoid of scientific 

 value. 



B. Submergence and its effects. The actual sequence of deposits. 



In the fenland and on its borders we meet with marine deposits 

 above sea-level, which have long been known around March and 

 Narborough. They occur above and below fen-level at March 



