88 PROF. J. TEISTWICH ON THE RELATION OE THE 



logically distinct from them, and is characterized by the first 

 appearance in England of Tellina balthica.^' 



Ill 1870 * Mr. Wood reiterates his opinion that the Pebbly Sands 

 of Belaugh, from which he had then obtained 35 species of Mollusca, 

 are " continuous with the pebbly sand underlying and interbedded 

 ivith the Till along the Cromer coast and yielding similar shells," 

 and he groups these together -^ ith the Contorted Drift, as " Boner 

 GlacwV (the italics are mine). 



In January 1870 my paper on the Norwich Crag and Westleton 

 Be; Is was read f, although it was not published until 1871, 

 owing to difficulties connected with the lists of fossils. The main 

 object of that paper was to correlate the Westleton with the Mun- 

 desley Fluvio-mnrine Beds, and to show that they passed uucon- 

 formably under the Till of Cromer, with which they have no con- 

 nexion, and overlaj^ the Norwich Crag. 



It was not until 187^^'!^ ^^at Mr, Wood published the detailed 

 sections upon which his conclusions were founded, and gave a full 

 list of the fossils of the "Lower Glacial" beds, including the Bure- 

 Yalley and AVeybourn Crags. This showed that although we had 

 both arrived independently at the conclusion that the Pebble-beds 

 of both counties were newer than the Chillesfoid Beds, there were 

 many points, such as in the correlation of the Weybourn Beds, the 

 passage upwards of the Pebbly Sands into the Glacial Beds, the 

 construction to be put on many of the Sufllblk Beds, and other 

 jDoints, which I shall have occasion to notice as we proceed, that 

 constituted radical differences. 



We have in 1880 § the last expression of Mr, Wood's views Avith 

 reference to the Pliocene, Glacial, and Postglacial deposits. In this 

 paper he dealswiththcmany theoretical consideiations connected with 

 the changes of level and conditions, and the range of the several de- 

 posits. He also alters some of his i)revious determinations in the Suf- 

 folk area, and explains his views of the " origin and mode of accumu- 

 lation of the Pebbly Sand and Cromer Till as one formation." But 

 to obtain a correct knowledge of Mr. W^ood's range of work, the 

 reader should consult the several papers here referred to. It is 

 difficult to epitomize them owing to the frequent introduction of 

 theoretical considerations among the questions of fact, and the re- 

 peated subordination of the latter to the former. 



In 1881 I! Mr. H. B, A\oodward came to the conclusion that in 

 Norfolk the beds between the Glacial Drift and the Chalk formed an 

 indivisible group — " the U2)per Crag or Norwich Crag Series '" — 

 composed of a variable group of sands, Pebble-beds, and laminated 



* Geol. Mag. vol. vii. p. 17. 



t Quart. Journ. Geol. Soc. toI. xxTii. p. 452. 



\ ' lutrocluction to tlie Supplement to the Monograph of the Crag Mollusca,' 

 Palcvontographical Society, ]b72-1874, pj). xv-xviii. 



§ Quart. Journ. Geol. Soc. vol. xxxvi. pp. 457-527. 



li 'The Geologv of tlie Country around Norwich,' Mem. Geol. Survey Expl. 

 of Sheet 66 N E.,'S.E. pp. 31-41. 



