208 Gcolotjical Society. 



The figures on the left give the :4)])roximatc heiglit above 

 sea-level. 



It is believed that Xos. G and 5 were formed during a iK'riotl of 

 aggnidation, and 4-1 during one of subsequent erosion with minor 

 aggradation; but it eamiot be conelusively proved that Gand Hare 

 of different ages, although the deposition of the be<ls G below those 

 of series 3, where they oeeur together, and the oecurrenee of 

 Jlippnpotamus i\i\<i Bi'lyrandia maryinata with Corbicula suggest 

 an early date for these Cori/cw/«-bearing beds. 



Taking the beds in the order of reputed age, the following 

 observations are noted : — 



Chellean implements have been found at low levels at Barnwell 

 and Chesterton, and may belong to the beds 1. The Observatory 

 Jieds have yielded abundant imjdenients of Chellean, Aeheulean, 

 and early Mousterian types, the last-named a])j)arently in dejRisits 

 later than those cont<iining the two first-named. Unfortunately 

 niollusca and mammalia are very rai-e in these beds. The Hun- 

 tingdon lioad Clays require much fiulher work, as only ])oor 

 exposures have hitherto been found, and it is not clear that they 

 are newer than the Observatory' Beds. 



The beds referred to the Newer Barnwell Village Series contain 

 abundant remains of the mammoth, woolly rhinoceros, and fairly 

 numerous horse-bones. Implements associated with them suggest 

 an Upper Palaeolithic age. 



The Newer Downing Site ]ieds have yielded a cold molluscan 

 fauna. They are probably somewhat earlier than the Barnwell 

 Station Seriefs, which has furnished a similar molluscan fauna, and 

 also an Arctic flora, the jtlants of which were identified by the late 

 Mr. Clement Keid. Keindeer occurs in these beds. 



The paper is chiefly a record of facts, but it is intended to l)e 

 preliminar}' to a detailed sm-vey of the Pleistocene deposits of the 

 Great Ouse Basin, which are so important as throwing light upon 

 the relatlonshi]) of the Paheolithic beds to the glacial accumulations, 

 and also to the marine beds of iMarch and the Nar Valley. 



A])j)endix I, on the Non-Marine !Mollusea, is supj)lied by Alfred 

 Santer Kennard, F.G.S. and Bernard Barham Woodward, F.L.S., 

 F.G.S. 



Lists are given of the non-marine mollusca from the various 

 sections, with their degrees of frequency. The.se lists are based on 

 examination of old collections and on a large amount of new 

 material. Notes are ajtpended on some of the .s])ecies, and con- 

 clusions as to the ages of the Cambridge gravels are given, based 

 on the molluscan evidence. 



Appendix 11, on the Implements, is supplied bv ^lile> (.'. iJurkitl, 

 M.A. 



