mid Freshis^ater Deposits of Eastern Norfolk. 369 



that of Old Hythe point (fig. 13.). It will sometimes happen, 

 however, that the enveloping beds of drift appear to be folded 

 completely round a nucleus of chalk or sand, or any other ma- 

 terial found in the mud cliffs as in the annexed cut (fig. 15.) 

 or in fig. 16, which represents a perpendicular cliff ^0 feet high, 



Fig. 15. 



FiiT. 1< 



Folding of the strata between 

 East and West Runton. 



Section of concentric beds ivesi of Cromer. 



in which the beds are: 1. blue clay; 2. while sand in thin 

 layers; 3. yellow sand; 4. striped loam and clay ; 5. laminated 

 blue clay; and I saw curves not far from this place which ex- 

 tended for a vertical height of 50 feet, in which SOdistinct strata, 

 without counting the subordinate laminae, in all 24 feet thick, 

 presented the same concentric arrangement. The beds con- 

 sisted alternately of blue clay and white sand, the bed of sand 

 exposed in the centre being blackened by bituminous matter. 



I have mentioned some of these cases of the apparent fold- 

 ing of the beds round a central nucleus in the Principles of 

 Geology, especially one which occurs in the cliffs east of 

 Sherringham, where a heap of partially rounded flints about 

 five feet in diameter appears nearly enveloped by finely la- 

 minated strata of sand and loam, in the midst of which agrain 

 is a nucleus of loam. After a more scrupulous examination 

 of many of these cases, I have now ascertained that they are 

 all, without exception, examples of the intersection of a series 

 of strata which have been bent into a convex form, the appa- 

 rent nucleus being in fact the innermost bed of the series, 

 which has become partially visible by the entire removal of 

 the protuberant part of the outer layers. 



I observed a portion of a cliff 8 feet in vertical height be- 

 tween Beaston Hill and East Runton, in which a nucleus of 

 very loose sand 18 inches in diameter {a) was surrounded 

 iiy layers of clay and loam as represented in fig. 17. The 

 vertical beds on the left side of the cut consisted of similar 

 incoherent materials, some of the seams of sand being charac- 



