43 



ing stones of various sizes and inclined at various angles ; the 

 chalk pebbles were rounded, and the others angular or sub- 

 angular, though few showed any traces of glacial striae; the 

 thickness shown was about six feet, but I was told that four 

 feet of coarse rubbly gravel lay between this and the Chalk 

 below. 



The sandy clay I take to be the Boulder Clay spoken of 

 by Prof. Seeley (see p. 36), to which material it certainly bears 

 some resemblance ; it appears more likely however to ])e a 

 lenticular bed of re-arranged Boulder Clay forming part of the 

 gravel mass. 



The rock fragments to be found in this loam are — 



Chalk, which formed about 50 per cent, of the pebbles. 



Flints, of which there were about 30 per cent., leaving about 

 20 per cent, of other fragments consisting of the following rocks : 



Red Chalk, more like that of Lincolnshire than the red rock of 



Hunstanton. 

 Hard cream-coloured Chalk. % Chalk-rock. 

 Grinoidal Limestone. 1 of Cai-boniferous series. 

 Oolitic and shelly Limestones, from Northampton or Lincohishire. 

 White micaceous Grit. 1 from Coal-measures. 

 Broion Quartzite, possibly from the New Red series. 

 Septaria, from the Kimmeridge and Oxford Clays. 

 Coprolites from the Cambridge Greensand (not rare). 

 Gryphcea incurva (Lias) and G. dilatata (Oxford Clay). 



Besides these Prof. Sedgwick mentions : — 

 Pieces of Basalt and part of a basaltic column. 

 Rolled masses of Granite and Porphyry. 



Pebbles resembling those in the New Red Sandstone (probably 

 the brown quartzites above mentioned.) 



All the above rocks have evidently been derived from the 

 Boulder Clay, which contains an exactly similar collection, even 

 Coprolites having occasionally been found in it ; these nodules 

 however appear to be more frequent in the gravels, although 

 this comparative abundance may be deceptive and may be due 

 to the sifting and collecting of the stones into narrower compass 

 than they orighially occupied in the Boulder Clay. Under any 

 circumstances, however, it is not easy to account for the presence 



