RED CHALK. 



the peroxide of iron, and containing minute siliceous grains, and small pebbles of chal- 

 cedony, quartz, flint, &c. This rock from Hunstanton yielded by analysis carbonate of 

 lime, with a little alumina, 82'3 ; peroxide of iron, 6"4 ; silica, 11'3 = ; 100. 



Hunstanton Cliff',^ of which the annexed woodcut gives an idea, consists of five 

 different beds — 1st, the uppermost, or white chalk, is forty feet thick ; 2nd, bright-red 

 chalk, four feet ; 3rd, yellow sandy bed, ten feet ; 4th, a dark brown pebbly stratum, forty 

 feet ; and 5th, a dark-coloured bed, almost black, twenty feet. 



These divisions at Hunstanton, the Rev. T. Wiltshire states, do not run into each other, 

 but are quite distinct ; the red chalk is as clearly separated from the white as though the 

 one had been covered by a broad band of paint, and the same remark holds true of the others. 

 When the sun shines upon the cliff, and lights up the bright white, bright red, the pale 

 yellow, and the dark brown and black, and casts a shadow over the mass of gaily tinted 

 materials at the base, a picture is produced not easy to be surpassed in beauty, and 

 certainly not to be fully appreciated unless it is seen. 



The Red Chalk is very fossiliferous, containing Ammonites, Belemnites, Brachiopoda, 

 Echinidse, and Corals. 



In compliance with my request, ray friend the Rev. T. Wiltshire, F.G.S. has kindly 

 sent me the following note, embodying his latest observations on the Red Chalk at Speeton.' 



" In answer to your inquiry respecting the natural section of the Red Chalk at the 



1 For ample details, see the Rev. Thos. Wiltshire, on the 'Eed Chalk of England.' 

 ' To this gentleman's kindness I am likewise indebted for the above woodcut, copied from a water- 

 colour drawing ii his collection. 



