324 



ME. F. W. HAKMEE ON THE LENHAM BEDS [Aug. 1 8 98, 



The Coralline Crag of Ramsholt 

 and Sutton occupies one side of 

 an old channel or depression in the 

 London Clay, which at that point 

 coincides to some extent with the 

 present estuary of the Dehen (see 

 fig. 3). At Ramsholt the Crag 

 was formerly exposed in a low 

 cliff close to the river, but it is 

 not now visible ; its junction with 

 the London Clay there was pro- 

 bably little, if at all, above Ord- 

 nance datum. 



Prestwich regarded the Eams- 

 holt bed as belonging to his zone C, 

 and he gave a list of 17 species of 

 melius ca from it, besides echino- 

 dermata, etc., some of which he 

 believed to be more abundant there 

 than elsewhere. Most of the 

 mollusca, however, are common 

 everywhere in the formation, and 

 I do not think that generally the 

 species mentioned can be looked 

 upon as more characteristic of one 

 portion of it than of another. 



At Sutton, a short distance (^ 

 mile) from Ramsholt Cliff, there 

 was formerly a pit (H of Prest- 

 wich's section) at which the no- 

 dule-bed (zone A) was observed by 

 himself and Prof. Eay Lankester. 

 At that spot the Crag is, I believe, 

 at a higher level than that of 

 Kamsholt, resting on the London 

 Clay 8 feet above high-water mark 

 (see fig. 3).^ Prestwich, however, 

 called the beds there exposed 

 zones A, B, & C. 



At his pit D, 500 yards north- 

 east of the last, where the London 

 Clay rises 12 feet higher, he classed 

 the beds as zones D, E, & F, 

 while at pit P, 250 yards distant, 

 he considered them to belong to 

 zones E, P, & G. It will be 

 seen by reference to fig. 3 that, 

 taking the dip into account, in 



^ The measurements in Prestwich's 

 paper and sections are somewhat diffi- 

 cult to follow. Some are taken above 

 high-, some above low-water mark of 

 the River Deben, and some, possibly, 

 above Ordnance datum. 



