65 



JOURNAL OF CONCHOLOGY. 



Vol. 15. JULY, 1916. No. 3. 



ON THE CONCHOLOGICAL FEATURES OF THE LENHAM 



SANDSTONES OF KENT 



AND THEIR STRATIGRAPHICAL IMPORTANCE. 



( Continued from page 64). 



By R. BULLEN NEWTON, F.G.S.,i 

 OF THE British Museum. 



(Presidential Address delivered at the Annual Meeting, October i6th, 1915)- 



In a further contribution, Mr. Harmer^ regarded the Lenham beds 

 as synchronous with the ferruginous sandstones of Louvain and Diest. 

 He stated that among the Diestian sandstone fossils were about sixty 

 species of mollusca, some being Crag forms, whereas a few were of an 

 older or Miocene type and not found in the Coralline Crag ; similarly 

 the Lenham shells included many Miocene species, such as Terebra 

 acui/iinata, Triton hepiagoniim, PIeuroto?na consobrina, P. jouanueti, 

 Cancellaria contorta, Hinnites cortesyi, and Area diluvii. A table of 

 the British Pliocene deposits was included, being nearly similar to 

 that issued by the same author in 1900, in which the "Lenhamian " 

 formed the lowest of the Pliocene stages, the Box-Stones being 

 regarded as equivalent to the Waenrode Beds of Belgium (Bolderian, 

 according to Mr. Van den Broeck). 



Subsequently, Mr. Harmer^ repeated his former views on the age 

 of the Lenham deposits, the fauna being spoken of as presenting a 

 distinctly older type than that of the Coralline Crag and approaching 

 more nearly a INIiocene facies, instancing, among other shells, the 

 abundance of Anadara diluvii, which occurs in the Vienna Basin, the 

 Touraine area of France, and the Bolderian of Belgium. 



In their memoir on the geology of Holland, Messrs. G. A. F. Molen- 

 graaff and A. J. M. Van Waterschoot Van der Grachf' referred to the 



1 Published by permission of the Trustees of the British JNIuseum. 



2 A Sketch of the Later Tertiary History of East Anglia : Proc. Geologists' Assoc, 1902, 

 vol. 17, pp. 416-479. 



3 The Pliocene Deposits of the Eastern Counties of England : Geologists' Assoc. Jubilee 

 I'ohtfne, 1908, pp. 86 — 102. 



4 Niederlande : Handb. Region. Geologic, 1913, vol. i, parts, PP- 5^ — ,53- 



E 



