320 MR. F. W. HAEMER ON THE LENHAM BEDS [Aug. 1 898, 



of shells from Waenrode is very short, and it may not be truly 

 representative. So far as the evidence goes, however, the fauna 

 does not seem to me typically Miocene, though Belgian geologists 

 believe, on stratigraphical grounds, that it is at the latest of 

 Miocene age.^ Without expressing, therefore, any decided opinion 

 on the subject, I merely call attention to this interesting discovery 

 of a bed which, like that of Lenham, contains a fauna closely 

 resembling at the same time those of the Coralline Crag and of the 

 Belgian Miocene. 



Tabulating these results, we have : — 



Extinct forms Coralline Crag 

 Waenrode 42 0/0 68 «/o 



DiESTIEN BEDS. 



Zone k Terehratula grandis 46% 85% 



Lenham 43% 77 °/o 



Belgian Miocene. 



Zone a Fectunculus pilosus 53 °'o 54 % 



, , FanopcBa Menardi 59 % 45 <*/© 



III. The Coralline Crag. 



As is well known, the Coralline Crag occurs : (a) at Tattingstone, 

 4 miles south of Ipswich, limited there probably to a very small 

 area, and exposed in one section only^; (b) at Eamsholt and 

 Sutton, on the' eastern bank of the Deben estuary, where it may 

 be traced, though not continuously, for rather more than | mile ; 

 and (c) in the main mass of the formation, extending from 

 Boyton and Gedgrave to Iken and Aldeburgh (Butley Creek and 

 the river Aide intervening), and thence to some submarine rocks 

 off the coast at Sizewell, 5 or 6 miles N.N.E. of the last-named 

 locality. Traces of it are said to have been found at Trimley 

 {teste Acton) ^ and at Waldringfield (Whitaker),* and possibly it may 

 exist elsewhere under the high land between the Orwell and the 

 Deben, or between the latter river and Butley Creek. Along the 

 low land fringing those rivers, however, no Coralline Crag is known, 

 the Eed Crag being shown in many places to rest directly on the 

 London Clay, as it does also along the coast from Walton-on-the-Naze 

 to Bawdsey. 



The method adopted by Prestwich was to take the beds present 

 in the small outlier at Sutton (which he described at some length) 

 as typical of the formation generally, but he did not attempt to 

 show, either by stratigraphical or palaeontological evidence, that 

 the divisions observed at Sutton are constant over the whole area, 



^ M. Van den Broeck was at first inclined to think that the Waenrode deposit 

 ■was Pliocene, Ann. Soc. Eoy. Malacol. Belg. vol. xix (1884) p.lvi. 



■^ [I understand that a second exposure of Coralline Crag has recently been 

 discovered at Tattingstone. — June, 1898.] 



^ Suppl. ' Crag MoUusca,' Introd. p. iii, Monogr. Palaeont. Soc. 1872. 



^ Mem. Geol. Surv. 1885, Ipswich, p. 65. 



