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the eight zones pro- 

 posed by him, to- 

 gether with my re- 

 marks thereon. It 

 will he seen that 

 many of the charac- 

 teristics which he 

 considered distinctive 

 of certain parts of the 

 formation only are of 

 the most general cha- 

 racter and are equally 

 applicable to others ; 

 but even if this were 

 not so, slight litho- 

 logical differences are 

 hardly a satisfactory 

 test of age, unless- 

 they can be traced 

 stratigraphically. The 

 sediment now accu- 

 mulating at the 

 bottom of the I^ortb 

 Sea is not everywhere 

 the same. 



Mr. Burrows, in 

 the Geol. Mag. paper 

 before alluded tOy 

 claims the evidence 

 of the foraminifera 

 as being in favour 

 of the zone-theory. 

 I differ from that 

 gentleman with much 

 regret, but I cannot 

 think that the facts- 

 he recites are conclu- 

 sive. In his paper, 

 and in the mono- 

 graph by himself and 

 his coadjutors, certain 

 species of forami- 

 nifera are stated to 

 be specially charac- 

 teristic of zones D, E, 

 F, & G at Tatting- 

 stone, Sudbourne, 

 Gedgrave, and Alde- 

 burgh,^ but on re- 

 ferring to the list pub- 

 lished by him ^ it will 



^ No evidence is offered 

 as to zones A, B, C, or H. 



^ ' Crag Foram .,'Monogr. 

 Pal£eont.Soc.l897,p.374.. 



