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



more than five yards in the mile. At Sedgeford, where hill 

 and vale are abruptly formed, the chalk is remarkably frac- 

 tured, although the strata are but little displaced. 



The thickness of the " chalk without flints," exposed at 

 Hunstanton cliff, is 28 feet : the same bed including the gray 

 chalk is found to be 60 feet in the well at Diss. 



Mineral Contents. — A few small nodules of dull white flint 

 are interspersed through this bed, particularly in the upper 

 portion. Crystallized carbonate of lime is at present only 

 found lining the interior of Echini and Terebratulae. Metalli- 

 ferous substances are of rare occurrence, and consist of amor- 

 phous iron pyrites; hydrate of iron partaking of the form of a 

 septarium, as casts of Echini, and as an ochrey powder depo- 

 sited between the natural separations of the chalk ; the black 

 oxide of manganese is very generally scattered through the 

 chalk of Western Norfolk in minute scales, and in dendritic 

 forms: at the large pits in Congham, I found it also in thin 

 seams, deposited in the vertical and horizontal partings of the 

 chalk, and frequently mingled with the oxide of iron. In this 

 county, the green particles (silicate of iron) usually found 

 in the lower chalk of the southern counties, are not met 

 with. 



Organic Remains. 

 [Those marked with an asterisk are from the gray chalk.] 



Name. Reference. 



A small portion of the stem of a Lycopodite. 



Polypi. 

 Spongia paradoxica. .. 

 ♦Ventriculites radiatus. 

 Radiaria. 



♦Echinus saxatilis 



♦Cidaris cretosa 



Galerites albogalerus. 



subrotundus. 



♦ Hawkinsii. .. 



,de-j 



pressed var. 

 ♦Spatangus hemisphaericus. 



planus. ..A 



♦Cucumerine spines. .. 



Crustacea. . 

 Astacus Sussexiensis .. 

 Annelides. 



♦Serpula antiquata 



♦Vermiculari Sowerbii. 



ClRRIPEDA. 



u Pollicipes sulcatus ?f 



Geol. Norf.,S. Wood w d . 

 Geo!. Suss., 1. 10-13. 



Org. Rem., t. 3. f. 1. 



Ibid. t. 4. f. 3. 

 Geol.Suss., 1. 17. f. 8. 



Ibid. f. 15. 

 Geol. Norf.,t. 5.f.5. 



Ibid. f. 4. 



Phillips, t. 1. f. 16. 



{ 



Geol. York., Phillips, \ 

 t.l.f. 15./ 



Geol. Suss., t. 30. f. 3. 



Min. Con., t. 598. f. 4. 

 Geol.Suss.,t.l8..f.l4.15. 



Min. Con., t. 606. f. 7- 



[wold. 



Locality. 

 Marham. 



Hunstanton. 

 Ditto. 



Ditto. 



Ditto. 

 Do. Narborough, North- 

 Narborough. 

 Hunstanton, Marham. 



Marham, Gayton. 



Do., Narborough, Hun- 

 stanton, Shouldham, 

 Westacre. 



Hunstanton. 



Ditto, Marham. 



Marham. 



Ditto, Hunstanton. 

 Hunstanton. 



Shouldham. 



f Posterior valve only. 



