Mr. Rose's Sketch of the Geology of West IS! 01 folic. 173 



strata, still, as the spaces at present unexplored are very 

 narrow, and as the junction of the above-mentioned strata or 

 an equivalent is exposed at Hunstanton Cliff, with the excep- 

 tion of that of the inferior greensand with the Kimmeridge 

 clay, and of the latter with the Oxford, it is but a legitimate 

 inference that my arranged list exhibits the entire assemblage 

 of strata in the western division of our county. 



A brief description of each stratum in detail I now proceed 

 to give, with a list of its organic remains. 



Oxford Clay. — This deep bed of clay (the clunch clay of 

 Smith) occupies the whole of Marshland, and the fens of the 

 Norfolk portion of the Bedford Level : it forms the great sub- 

 stratum of this extensive flat; but possessing no qualities 

 offering any inducements to open it for oeconomical purposes, 

 we are in consequence but little acquainted with its physical 

 characters and oryctological contents. The most extensive 

 exposures of it have been at Denver Sluice and at Lynn; at 

 the former locality I had an opportunity of examining it, and 

 was favoured by Mr. Thornton (the clerk of the works) with 

 the following section and admeasurements. No organic re- 

 mains had been observed by the labourers : at my visit, I 

 picked out of the clay a compressed specimen of Ammonites 

 decipiens. 



Section at Denver Sluice. 



1. A light brown sandy loam 14, ft. 



2. Peat' 2 



3. Blue clay, inclosing roots and small portions of peat 2 



4. Peat, similar to No. 2 3 



5.*Similar to No. 1, but somewhat more argillaceous 2 



6. Dark ferruginous sand 3 



7. Oxford clay, dark blue, and very tenacious 5\ 



Section at Lynn. 

 To Thomas Allen, Esq., I am indebted for the following 

 detail of the strata observed in sinking a well for the supply 

 of a brewery. The Oxford clay was penetrated to the depth 

 of 630 feet; the first 450 were dug, the remaining 180 bored; 

 and after all the labour and expense, the quality of the water 

 was inapplicable, and the supply inadequate, to the wants of 

 the enterprising proprietor. 



1. Vegetable soil. 



2. Loam, used for making bricks 7 ft. 



3. Peat 2 to 2f 



4. Blue clay 8 



* Immediately beneath the peat on the surface of No. 5, a farthing of 

 Charles II. and a pair of scissors were found. 



