1.78 Mr. Rose's Sketch of the Geology of West Norfolk. 



sions appearing to be only a horizontal separation of one thick 

 stratum into two or more without any intervening substance; 

 there are also nearly vertical divisions of the rock, cutting it 

 into irregularly formed rhomboidal blocks. 



A few hundred yards to the south of the above pit, a well 

 has recently been sunk, affording very interesting information : 

 the following is a list of the strata, communicated to me by 

 the labourer, an intelligent man, and accustomed to the em- 

 ployment. 



Ft. Inch. 



1. Ferruginous sand, containing geodes and hoi- 1 7 



low cylinders of ironstone J 



2. Carstone 8 



3. White sand with occasional brown veins ... 7 



4. Green clay 6 



5. Carstone, darker than upper beds 2 



6. Carstone, with six or seven partings of the"^ 



green clay 1 to 2\ inches in thickness, not ( 

 in regular courses, but the stone imbedded j 



irregularly in the clay ... J 



27 6 

 This section is particularly valuable, as it identifies our 

 sands with the inferior greensand of Sussex*. 



At Shouldham Warren, an extensive excavation exposes 

 the variegated sands to the depth of twelve feet, covered by 

 three or four feet of rubbly carstone and ferruginous sand : 

 the varieties of sand here are white and brown, thin veins of 

 the latter running horizontally through the former, and fre- 

 quently assuming a concentric form. In the rubble at this 

 spot, as at most other localities, geodes, containing sand, small 

 hollow cylinders, and flat fragments of ironstone, are very 

 abundant, evidently resulting from the disintegration of that 

 portion of the ferruginous sand containing the veins of iron- 

 stone, the concentric arrangement of which has produced those 

 forms. 



At Downham, the loose sand is opened to the depth of 

 fifteen feet; it is covered by two or three feet of thin tabular 

 carstone. The general mass of the sand is white, with veins of 

 a greenish colour, and also a few yellow veins : six feet from 

 the surface there is a stratum of fullers' earth about an inch 

 in thickness, of an ash colour, with ochry specks interspersed ; 

 its analysis gives an abundance of iron in its composition, with 

 a very slight trace of carbonate of lime. The ferruginous 

 sands again appear from beneath their diluvial covering at 

 West Ryston; further south they are hidden by the alluvial 



• Phil. Mag. and Annals, N.S., 1827, vol. i. p. 138. Dr. Fitton. 



