480 Reports and Proceedings — 



such as 'Hhe masses of fragmentary chalk with little or no ad- 

 mixture of other matter," " angular fragments, very slightly water- 

 worn," and, on the other hand, the " detritus from greater distances ;" 

 the transfer of this chalk material in the direction of Cromer had not 

 escaped him. 



Mr. Searles Wood, jun., had proposed for the ''Drift or Glacial" 

 series of the upper Kainozoic period an upper and a lower ; he sub- 

 sequently subdivided the lower, whence resulted : — 



feet. 



1. Upper Drift, or Boulder-clay, maximum thickness.. 160-f 



2. Middle Drift, maximum thickness 70 



3. Lower Drift (boulder, till, and contorted beds of Cromer) 150+ 



The Lower Drift immediately overlies the Chalk, except near this 

 place, where it has what has been designated as the "Norwich 

 Crag" at its base, the inland facies of this division being a mass of 

 merely remanie chalk rubble, without any admixture of other ma- 

 terials ; this facies does not extend east of Norwich. Beyond and on 

 to the coast the Lower Drift is of sand ; above, on the coast 

 section is a blue till with boulders, horizontally bedded, passing up 

 into very contorted beds. These lower sands west of Cromer con- 

 tain the debris of the underlying Lignite beds. In the case of the 

 inland, as of the coast-line facies, the character of the accumulation 

 is immediately dependent on the subjacent beds. When we bear 

 in mind that previously to the accumulation of this Drift-series the 

 boundary line of the Nummulitic formation by Sudbury and Ipswich 

 had been well defined, and consequently that High Suffolk and 

 Norfolk presented a range of bare Chalk hills, we are prepared to 

 adopt the supposition of Mr. S. Wood, jun., and refer this division 

 of the series to the agencies of subaerial glaciation. 



C. Postglacial. — In the Nar valley, which joins the Ouse at Lynn, 

 is met with a well-known set of marine depositions of this age. 

 They extend some nine miles along its course, and occupied what 

 must have been a creek at the time when the whole of the Bedford 

 level was sea — an inland extension of the Wash. Mr. Eose called 

 attention to this stage of the Kainozoic series in 1836, and assigned 

 it to its true position. This deposit, which is 40 feet in thickness 

 and 60 above the present sea-level, contains 27 species of testacea, 

 all of which are also North- Sea shells. 



These subjects have engaged many speculative and ingenious 

 minds, from the middle of the last century, down to those now 

 actively at work here — such as Arderen, William Smith, the father 

 of Geology, the Taylors, Eobberds, the Woodwards (of whom four 

 generations), Clarke, Mitchell, Trimmer, Gunn, Osmond Fisher. 

 But I should be wanting to the place in which we are now met, 

 wholly unworthy to fill this chair, wanting to the great subject 

 which assembles so many here, wholly forgetful of my own obliga- 

 tions, if I were not mindful that Norwich may claim with Cambridge 

 joint ownership in the Woodwardian Professor — the Eev. Canon 

 Sedgwick. 



