128 
THE GEOLOGIST. 
back of wliicli rise other cliffs of dark green irony water-holding 
sand, that of the middle division, marked eveiywliere in its coui'se by 
the prolific gi-owtli 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 
higher, until at Lympne we look from another lofty headland over 
the flat map-like comitry of the Marsli, with its lines of dykes and 
Lign. 18.—" Jill'ii Pipe." The junction of the Lower Greensand and Weald Clay. 
water-courses. As we descend this promontory, past the stalwart 
ruins of the ancient Roman castrum, we cross what I believe are the 
Neocomian sands, below the ragstone-beds, and a pretty spring of 
water, which streams away by a rustic wooden gutter, marks the 
junction of the sand with the impervious weald-clay beneath. 
