402 



MR. G. W. LAMPLUGH ON THE 



(n) Selwichs. — lu the bay called 8elwicks*, just under the Light- 

 liouse, the buried valley-side is quite cut through, but the section is 

 slipped and obscure. Transported iSTcocomians seem to make up the 

 greater part of the Basement Clay, and this peculiarity continues for 

 over a quarter of a mile farther north. 



Fig. 14. — Section at the top of the cliff at Common Hole, Selivicks, 

 showing surface- contortion in the Chalk. 



s.s.w, 



N.N.E. 



The wavy lines represent the Chalk-with-flints : top layers broken into rubble. 

 Above is seen the dark ' Basement ' Boulder-clay. 



The uppermost layers of the Chalk on either side of the bay show 

 very fine examples of surface-contortions due to glacial action. 

 These are best seen on the north side near "The Limekiln," and on 

 the south side in the outstanding ridge at " Common Hole " (shown 

 in fig. 14) and above the mouth of " Kirk Hole." In all these 

 cases the top beds of the Chalk are throw q into sharp folds, 

 and the crest of the fold is generally broken and shaved off* so as 

 to pass imperceptibly into the overlying rough chalk-rubble or into 

 Boulder- clay f. The force seems in every instance to have pressed 

 forward from north to south J. 



* (o) Stottle Banh(Fl. XIII. fig. 9) to North Sea Landing . — Beyond 

 Selwicks the buried valley passes obliquely across the headland, and 

 the Chalk rises higher, so that at Stottle Bank, 500 yards north of 

 Selwicks, the cliif shows less than 20 feet of drift, overlying 130 feet 

 of Chalk (see PI. XIII. fig. 9). As the drift thins the lower bands 

 of the Basement Clay (4'\ 4'^) die out successively upon the slope 

 until only the shelly upper portion remains (4^). This is overlain 

 by gravels, and the gravels by reddish Upper Clay. 



Beyond Stottle Bank the indented coast trends north-west, and 

 for the next mile, in spite of considerable irregularity in the top of 



* Wrongly written ' Silex Bay ' on the Ordnance maps ; fisherfolk do not 

 usually add ' Bay ' to ' Wick ' or ' Wyke.' 



t These sections are strongly confirmatory of the views put forward by 

 Mr. Clement Reid to explain the folding of the Chalk and transportation of 

 the Chalk boulders in the Norfolk Glacial sections. See Geol. Survey Mem. 

 ' Cromer,' pp. 115-116. 



\ If any doubt remain as to the glacial origin of these disturbances of the 

 rock-surface, the occurrence of a beautifully scratched and polished surface of 

 Coralline Oolite, which I found last summer under the Basement Clay near Filey 

 Brigg. 10 miles farther north, will serve to dispel it. The scratches pointed 

 N. 20° E. 



I 



