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



The area of my inquiries has the natural boundaries of the 

 county to the south, west, and north, and a line drawn from 

 Wells to Thetford traces its eastern limit. The regular strata 

 comprised within this area are, the chalk, with and without 

 flints; the chalk-marl, including the firestone; thegault;the 

 inferior greensand ; the Kimmeridge and Oxford clays. 



Taking Mr. Smith's geological map for my ground-plan, 

 I propose to furnish also some notices of the subordinate 

 members of the strata he has represented which were un- 

 known to geologists at the period of his inquiries. Before 

 entering upon the strata in detail, I will insert a tabular ar- 

 rangement of them, in their order of superposition, beginning 

 with the lowest member of the series. 



Formations. Subdivisions. Localities. 



("Oxford clay Marshland and the Fens. 



^ .. J Kimmeridge clay, inclosing! 



° l e "^ Septaria, and beds of bitu- >Southery, Gaywood, <&c. 



[_ minous shale J 



Gnterinr "veen-and oarstor.e r Hil S av ' Downham, Sliould- 

 Greensand..<j ] "^ncSi) . /...?"?.. ?.!.*{ [^^^eton, Hunstan " 



'Gault. golt brick-earth of) West Dereham, Shouldham, 

 Smith / Pentney, Bilney, &c. 



^^t^^.^^ } H «"stanton, Heacham. 



Chalk without flints, includ-r Ho ^ old \ St <* e .J"* 

 ••"S ing the firestone equiva-^ ^ Dereham, ShoJdham, 



lent, and chalk-marl Marham Gayton Sand- 



L nngham, Hunstanton. 



Chalk with flints, or medial f Th f° t r ^ Saham Swaffliam, 



chalk of Woodward < S? 1 T™* n * ** 



L {, Ihornham, Burnham,&c. 



["Yellow and blue clay, brick-"] 

 ...< earth loam, sand, gravel, >General covering. 

 L coarse breccia, &c J 



["Marine and lacustrine de-~) Valley of the Nar, Eau-brink, 

 ... • J posits, peat, subterranean I Marshland, and the Fens, 



uvum....^ forests, and calcareous f Stoke, Marham, Carbrook, 

 L tufa J &c. 



From the above list of the strata, it will be seen, that several 

 other members of the British series, usually found associated 

 with ours, are wanting, namely, the coral rag, Portland oolite, 

 Purbeck limestone, Hastings sand, and Weald clay; and it is 

 probable that no equivalent of either of them exists; for al- 

 though I have not been so fortunate as to see the inferior 

 greensand immediately reposing upon the Kimmeridge clay, 

 the gault upon the inferior greensand, or the lower chalk 

 and marl beds upon the gault, no excavation having, to my 

 knowledge, been made at those particular junctions of the 



Chalk 



Diluvium 



