Reports and Proceedings. 31 



bed to be the representative of tbe Glault of Cambridge and Folke- 

 stone. 



The Lower Greensand at Hunstanton cliff is clearly divisible into 

 two kinds — a friable ferrugiaous sandstone, and a hard conglomerate. 

 At Bilney, between Swaffham and Lynn, tliree. varieties are distin- 

 guishable — 1st, a brown tabular sandstone ; 2, a green clay ; 3, a 

 brown Carstone in large rhoraboidal blocks. In Norfolk the Lower 

 Greensand rock is pro vincially called "Carstone;" organic remains 

 are very sparsely distributed through it. At Downham, Trigonia 

 alcBformis and T. clavellata are met with in a bed of ferruginous 

 sand ; at Dersingham-heath, Nautilus radiatus, a Thetis, and a Natica, 

 similar to those found in the Lower Greensand of the Isle of Wight ; 

 at Hunstanton, Ammonites DesTiayesii, and a SypJionia in fragments, 

 are found. 



Mr. Eose next called attention to the Cretaceous group in Kent, 

 contrasting the physical characters of the Chalk -marl and Upper 

 Greensand of Folkestone with that of Norfolk ; the Chalk-marl of 

 Kent being of an ash-gray colour, and the Upper Greensand of a 

 still darker gray, the Upper Greensand in Norfolk appearing as a 

 white and red limestone. 



The Author adverted to the transition of the red bed of Hun- 

 stanton into the blue Gault clay in its strike southwards at Leziate, 

 from whence it continues entirely blue to West Dereham.^ 



The Lower Greensand of Folkestone is very calcareous. Dr. 

 Fitton divided it into a series of three beds, the middle bed of which 

 " abounds in green matter, and is retentive of moisture." On com- 

 paring these with the three beds at Bilney, previously mentioned, 

 Mr. Eose was of opiaion that only the three upper beds of the Lower 

 Greensand of Folkestone are represented ia Norfolk. 



The inferior beds of the Lower Greensand at Hythe possess the 

 character of a greenish coloured limestone, which is sufficiently 

 calcareous to bum into lime, and abound in organic remains. 



In conclusion, the author observed that a person acquainted with 

 the Norfolk strata only, would be at a loss to recognise those in Kent 

 as rocks of the same era. He therefore laid it down as advisable 

 not only to employ Dr. Wm. Smith's mode of identification of strata 

 by their organic remains, but also to call in the aid of position in the 

 series of formations ; for example, when a stratum contains fossils 

 common to two or three other strata — the lower red bed in Hunstan- 

 ton cliff being a case in point — then its proper place in the series 

 must be decided by its relative position. 



A cordial vote of thanks was passed to Mr. Eose for his very in- 

 structive paper. 



^ The Artesian -well-boring at Messrs. Colman's "Works, Carrow, Norwich, after 

 passing through the chalk, struck a bhie clay, containing Inoceramus sulcatus, JBelem- 

 nites minimus, and other Gault fossils. — Edit. 



