The Chalk Range. 277 



ringham, Marham, Shouldham, West Dereham Grange, 

 Stoke Ferry, and Hockwold-cum- Wilton. The gray chalk- 

 marl at Sandringham is of nearly as dark a shade as that of 

 Hunstanton ; and in it are found the same Ammonites, and 

 Pecten Beaveri and orbicularis. 



The same bed at Shouldham has a lighter shade, and has 

 many ochraceous stains : at this locality blocks of an exceed- 

 ingly hard nature are irregularly distributed through the softer 

 marl ; their solidity defies the blows of the quarrymen, and 

 they are not convertible into lime by the heat of the kiln. 

 Here I found Ammonites Mantelli, Plicatula inflata, and other 

 shells common to the lowest beds of chalk. 



At West Dereham Grange, the Inoceramus Cripsii (?) in 

 fragments is very abundant, in a matrix of the same character 

 as at the last-mentioned locality. 



In the lower beds of chalk at Marham have been found 

 two claws of Astacus Sussexiensis, and part of a striated 

 tooth with fragments of bone of some Saurian animal, all of 

 which I possess. 



We are now arrived at the stratum, commonly denominated 

 * Chalk without Flints*. It is a bed of much greater thickness 

 than the last-mentioned, and forms a range of hills to the west 

 of those of the superincumbent bed with flints, but of inferior 

 altitude. Its course is from Hunstanton through Heacham, 

 Sedgford, Ingoldesthorpe, Dersingham, West Newton, Hill- 

 ington, Congham, Gayton, Westacre, Narborough, Marham, 

 Barton, Stoke Ferry, Whittington to Hockwold. In all these 

 parishes it may be examined, large pits having been opened. 

 This chalk is sufficiently hard to be used as a building-stone, 

 and indeed has been used for ornamental architecture. The 

 natural divisions of the bed assume the form of oblique rhom- 

 boids, and small portions exposed to the weather separate into 

 lamina?. Horizontal seams of argillaceous matter are occa- 

 sionally interstratified with the chalk. The singular striae 

 observed by Mr. Mantell to occur at the natural separations 

 of the chalk in Sussex, are also seen here, particularly in the 

 pits at Marham and Westacre. Mr. Mantell thinks these 

 striae were " produced by a subsidence of the strata which 

 caused them to slip over each other before they were entirely 

 consolidated." May they not also be the result of concussion 

 from remote volcanic action ? 



At Hunstanton Cliff, the upper portion of this bed has evi- 

 dently suffered considerable disturbance. From my own ex- 

 amination of them, the strata rise about fifteen yards in a 

 mile, undoubtedly the result of some disturbing force, the ge- 

 neral rise of the strata around Swaffham being probably not 



