BLUE CHALK MARL. 83 



titles, the greater part having their nacreous covering preserved in the 

 most beautiful manner. In addition to those previously mentioned, I 

 have collected several species of Crustacea, scales and vertebrae of fishes, 

 teeth of the squalus mustelus, &c. ; crystallized sulphate of lime, or selenites, 

 was also very abundant. 



In this well, at the depth of 20 feet, a layer of red marl, a few inches 

 thick, was discovered, and another occurred 10 feet lower; this marl is 

 sufficiently soft for marking on paper, and much resembles the red chalk 

 used by artists, but is less pure and of a darker colour ; meandering 

 hues filled with a whitish earth, their outline bearing some resemblance 

 to the linear leaves of graminivorous plants, were distributed through the 

 mass. I have observed layers of red marl with precisely similar ap- 

 pearances, in the blue marl (or malm as it is there termed) of Bletchingley, 

 in Surrey. 



Cottage near the residence of the late Wm. Green, Esq. in the parish 

 of Ringmer. This well gave the following section : 



1. Yellow ochraceous loam, - - _ _ 5 feet. 



2. Blue marl, containing ammonites, inocerami, hamites, &e. 



and crystallized sulphate of lime, - - - - 15 feet. 



3. Dark blue marl, inchning to black, - - - - IQ feet. 

 Small crystals of sulphate of hme were disseminated through 



the upper part of this bed ; and in the lower, nodular masses of 

 indurated marl, containing an intermixture of green sand, with 

 small grains of quartz. These masses are permeated by veins of 

 splendid pyrites, and their external surface is studded with groups 

 of cubo-octaedral crystals of the same substance. 



4. Green chlorite sand, _ _ _ _ _ _ 4 feet. 



Total thickness, 34 feet. 



At this depth a spring of excellent water suddenly appeared, and rose 

 to the height of 10 feet. 



Cottage of Mr. Warren Lee, near Cooksbridge. 



M 2 



