Searles V. Wood, fun. — Sequence of Glacial Beds. 409 



pebbly sand reposes — and after- 

 wards in the deeper water deposit 

 of contorted drift wliicli forms the 

 top of the Lower Glacial formation, 

 that on the East side of England 

 the period of the Crag was fol- 

 lowed, and the Glacial period was 

 commenced, not by an elevation, 

 but by a gradual subsidence ; which 

 first giving rise to a littoral and 

 fluvio-marine deposit of rolled 

 pebbles and sand, was rapidly 

 succeeded by a submergence suffi- 

 cient to float bergs over the area 

 previously occupied by these pebbly 

 sands. The extent to which that 

 subsidence reached before the de- 

 nuding land-ice to which I have 

 adverted pushed over this sea- 

 bottom, may be approximately 

 inferred from the circumstance 

 that one of tliese intruded marl 

 masses (immediately North-west of 

 Woman Hythe) is 800 feet and 

 upwards in length, and 60 in 

 height, and has been so tranquilly 

 intruded into the contorted drift, 

 that it has sunk through it down to 

 the fundamental Chalk, squeezing 

 out the stratified beds on either 

 hand. It must be obvious that in 

 order to float a berg adequate to 

 such a marl-freight as this, many 

 hundred feet of water is necessary. 

 The accompanying section of three 

 miles of the Cromer ClifT will 

 show the position of these beds, of 

 some of the included marl masses, 

 and in particular of this enormous 

 transported mass, of which there 

 are, inland from this cliff, many 

 examples to rival it, in which 

 lime-kilns and marl -pits are worked 

 over North-east Norfolk. 



In order to call the attention of 

 the Geologists of Lancashire to 

 the divergence of the faunas, Mr. 

 Harmer and I read a paper at the 

 British Association in 1870, point- 

 ing out the facts as far as then 



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