Vol. 65.] 



THE BOULDERS OF THE CAMBRIDGE DRIFT. 



251 



importance to us remains unaltered : namely, that all the gravels 

 represent the heavier portions of the Boulder- Clay, and have 

 suffered little or no transport since their deposition by the ice. 

 "We are, therefore, perfectly safe in collecting our evidence from 

 boulders, irrespective of the fact whether they have been obtained 

 from the true Boulder-Clay or from the gravels. 



V. Details of each District in Separate Sections. 

 (1) Cambridge and neighbourhood. 



Here are included all specimens obtained within the borough of 

 Cambridge, Chesterton, Newnham, Girton, Trumpington, Shelford, 

 pits on the Gog-Magog golf-links, and Fulbourn. 



Tn this district there are numerous gravel-pits, either now in 



•^v w ^ s __^^^^Hunting 



don f \ 



\ St. Ives/ / { Thebrokenline 

 V>**fc J i I indicates the 





* -n_rr ^ f I eastward limit 





} J of the common 





' f occurrence of 

 1 J Scottish boulders. 





I / Newmarket© 



Xst.Neots 



olMadingley/J 

 Ha ? wic S /^CAMBRIDGE 



1 ' K"m„ I a. Toft Comberton ) ]~ 

 J r»n xt «.« n m °n^< ° •Barlforf .Fulboum 

 / Old North Road© " \, — >— %-/ ' 

 yf Lords X I 

 J Bridge^/ 1^ 



Bedford 



>. Barringtcjn 1 ^r — ^ 

 1 ^""iT^^^i^ii^ 01 '^-^ 



6 mi leu 





ji — "* ^~~^>±s{ Post on \ ^VS-aPampIsffia'd 



J ) \ NoHinxton \. faverlu^ 

 / \ \ j'Bartlow 



Biggleswade. 





\ V^ Chester ford 

 •Royston y 





Fenny . 

 Stratford 



Sketch-map of the I ^Saffron Walden 



Cambridge District f 



17 miles 



^Hitchin 



Scale: 8 miles to 1 inch. \ 



working order, or abandoned ; and the total amount of material 

 obtained is large. A good many specimens are here included which 

 were preserved in the Sedgwick Museum, and were obtained from 

 the older workings of the Barnwell gravel, now for the most part 

 closed. Any of these which seemed in the least degree doubtful 

 were rejected, but many of them bear labels in the handwriting of 



