THE GEOLOGIST. 



back of wliicli rise other cliffs of dark green irony water-holding 

 sand, that of the middle division, marked everywhere in its course by 

 the prolific growth of equisetacea and of ferns. 



From Seabrook the limestones and rag of the lowest division of 

 the Greensand rise towards Hythe, in a grass-covered cliff, occasionally 

 quarried for building and lime -burning, and gradually becoming 

 liiglier, until at Lympne vv^e look from another lofty headland over 

 tlie flat map-like coimtry of the Marsh, with its lines of dykes and 



w:>u-r-c'inirsos. As wc descend this promontory, past the stalwart 

 i-inns of tlio ancient Roman castrum, we cross what I beheve are the 

 NtMx'omian sands, below the ragstone-beds, and a pretty spring of 

 ^^ Mh I^ u lurli streams away by a rustic wooden gutter, marks the 

 juiiclion t.rtlio s:uul wiili tlie impervious weald-clay beneath. 



