314 Dr. FiTTON on the Strata below the Chalk. 



Section at Hunstanton Cliff. 



Ft. In. 



1. Dunes* of loose blown sand. 



2. Reddish clay, passing downwards into fine laminated sand; with bands of small! ^ 



pebbles 9 to/ 



3. Chalk, increasing as it rises, and attaining its greatest thickness in the cliff under the 



lighthouse. It is there about 30 feet thick, and divisible into three : — 



a. Grey chalk, in thin beds 20 



h. Grey chalk, in beds, from 1 to 3 feet in thickness 3 



c. The lower part, for about 8 or 10 feet, includes myriads of Inoce-l „ 



rami, chiefly in fragments, with large Ammonites 6 toj 



about 30 

 In my own notes I find it stated, that some of the gritty portions of the beds in 

 this part of the cliff are very like the Surrey Jirestone. 



[Upper green-sandll^ 



4. A "hard grey bed" like the malm-rock of Western Sussex (the upper member of t 



the Upper green-sand), including great numbers of ramified stems. — Quce. of Si- I- 2 

 phonia ? 1 6 to J 



[Gault ? ?.] 



5. Red calcareous and argillaceous matter; with multitudes of Belemnites Listen, Ino- "j 



ceramus, Pecten orbicularis, and some Terebratulae ; generally divisible into two beds. 



This is essentially a conglomerate, or breccia ; being composed of angular fragments I ^ « 



of black flint or flinty slate, imbedded in a very large proportion of hard, marly, j 



chalk-like matter, and varying in hue from a full to a pale brick-red. The colour | 



is not improbably caused by oxide of iron derived from the ferruginous sands below J 



[Lower green-sand.'\ 



6. a. Yellow sandstone, rather incoherent, with hollow concretions, and 1 



curved bands of bluish oxide of iron (the " Carslone " of Norfolk, K ^ 

 " Clinkers " of Hampshire), with quartz pebbles the size of beans. | " 

 Some stems of Siphonia in the upper portion 10 to J 



6. is composed of siliceous pebbles and broken fragments of flint, united -i 

 by a very large proportion of dark brown ferruginous matter; | 

 which, under the salt water becomes nearly black. The mass is I 

 traversed by fissures, which divide it into oblong blocks, and are ' 

 sometimes occupied by carbonate of lime. Continued downwards : 

 about 14 feet are visible J 26 



Total thickness of the Section f 60 



On the shore at the west end of the cliff, I observed numerous concretional 

 masses of a green conglomerate ; obviously part of a bed, like that of the shore 

 below the cliff at Shanklin, and at Sandown Bay, in the Isle of Wight. 



The Chalk without Jlints, which forms the upper part of the cliff at Hunstanton, rises, according 

 to Mr. Rose, about 15 yards in a mile; the general inclination of the strata around Swaffham 

 (Section No. 25.) being about 5 yards in a mile. This part of the chalk at Hunstanton comes 

 down into contact with the Red Chalk (the Upper green-sand being wanting), and, according to 

 Mr. Rose, admits of subdivision into three portions. 1. Chalk, of a pure white colour. 2. Grey 

 chalk, of a sandy texture, — (No. 3. of Mr. Muggridge's Section given in the note below). This 



* This word is in some parts of Norfolk written " Denes." In the village of Hunstanton are 

 loose blocks of green-stone and basaltic porphyry, of considerable size and worn at the edges; and 

 in the transported matter, at the signal end of the cliff, were some pieces of mountain limestone. 



f The measurements of Mr. Taylor and of Mr, Muggridge (published by Mr. Rose) coincide 



