22 , THE FORM KNOWN AS "HEAD" 



visible were it not for the encroachment of the sen 

 and occasional cutting back of the present cliff-linos, 

 This is shown in Fig. 1, as is also the original extent 

 of the Rubble-drift seaward, and the present position 

 of the Raised Beach and Head on the coasts of the 

 Channel. The dark seams in this section represent 

 the irregular masses of coarse rubble, and the lighter 

 parts the finer dtbris, but this only holds good 

 when the strata consists of beds of different degrees 

 of hardness, as in the Chalk and Oolitic districts. 



FIG. 1. Section of the Raised Beach and J/ead in a Chalk district. 



Tht Raised Beach M the dotted scam mtttrr tin " Ittad" 



Where the rocks consist of uniformly hard strata, as 

 in Devon and Cornwall, the whole detrital mass 

 exhibits sharp angular fni^menis >f r,,rk. and the 

 divisional linos of rough bedding arc scarcely 

 apparent. 



This overlying mass of rubble li,. . been termed 

 Jfearf, a name by which we. will continue to desig- 

 nate it, though it does not actually differ from the 

 rubble on the slopes of the inland hills where there. 

 are no cliffs for it to lodge under. S.viions of the 

 head are exposed in the cliff at Dover, } at the east 



1 ISoliind th.. South l-M.slc.n I :.,,Uvjiy Station. 



