221 THE PLEISTOCENE DEPOSITS AROUND CAMBRIDGE, [vol. lxiV- 



Pig. 10. — Milk-blue nuclei- 

 form qrattoir, natural 

 'size. fflfieda-House Pit. 



and those which occur on the surface : for the worked flints here, 

 as at Milton Road, have not been found in situ, but were picked 

 off the gravel-heaps. Among' those which give indications of 

 having been derived from the deposits are two of ' tea-cosy ' shape, 

 one of which, however, has the natural cortex at the base (fig. 9. 



p. 223). These are mottled indigo 

 and grey. A nucleiform implement 

 of milk-blue colour almost exactly 

 matches one found on Christ's 

 cricket-ground, to which reference 

 has already been made (fig. 10). 

 Among other relics is a squamous 

 flake. 



A very interesting find in this pit 

 was made by Mr. J. Romanes. It 

 is a 'pot-boiler" and undoubtedly 

 belongs to the deposits. It is 

 waterworn, not only on the cortex 

 but also on the broken surfaces, 

 has manganese efflorescences, and is 

 in parts encrusted with buff -coloured 

 stalagmite. 



The discovery of a cut bone, a pot- 

 boiler, and a few artefacts of Upper 

 Palaeolithic character, is strong evidence in favour of assigning the 

 containing deposits to one of the Upper Palaeolithic periods. 



{e) The Higher Downing-Site and Barnwell-Station 

 Deposits. 



The mollusca obtained from the higher deposits of the Downing 

 Site have been determined by Mr. A. S. Kennard, and the fauna 

 indicates that these beds .and those of the Barn well -Station Pit 

 belong to the same period, though probably they are not exactly 

 contemporaneous. 



I will first describe the Downing-Site section. During the War 

 some military trenches were dug on this site, 80 yards south of the 

 south-eastern corner of the School of Agriculture. Prof. A. C. 

 Seward detected a molluscan shell in the loamy deposit in one of 

 the trenches, and accordingly I had a well sunk at the above- 

 mentioned distance from the School of Agriculture. 



The section exposed is seen in fig. 11 (p. 22o). which was drawn 

 for me by Mr. J. M. Wordie and Mr. F. Debenham. The 

 Corbicu I a -he-dving deposits have already been noticed. 



The coarse ferruginous gravel is taken as the base of the upper 

 series, and rests with apparent unconformity upon the grey clay 

 beneath. The loams of the Corbicula Beds are much lighter in 

 colour than the sandy loam of the upper series, which is of a 

 reddish hue. The upper beds are contorted, as shown in the 

 section. 



