Mr. Rose’s Sketch of the Geology of West Norfolk. 31 
worn out by corn. * * * * * ‘They are found within two 
feet of the surface, and as deep as they have dug, water having 
stopped them at sixteen or eighteen feet deep. They fall into 
powder on being stirred.” 
The clay inclosing the shells is of a slate blue colour, and 
upon drying falls into laminz ; it contains numerous spangles 
of mica, and in the lower part of the bed at Winch and Bil- 
ney there is a considerable admixture of sand. It has a very 
muddy smell when first opened, and the water which rises 
from it is too offensive to be used for culinary purposes. No 
boulders have been found in it. 
At West Bilney it is generally covered by two or more 
feet of earth, consisting of vegetable soil, and yellow sandy 
loam, containing small pebbles and angular fragments of flint. 
The yellow loam burns into a red brick; a portion lying be- 
tween the loam and the blue clay, and probably a mixture of 
the two, produces a mottled brick; and the blue clay, usually 
denominated the brick-earth, becomes a fine white brick. At 
another part of the brick-yard bleached shells, chiefly Turri- 
tella Terebra and Mactra subtruncata, are found immediately 
beneath the vegetable soil in white sand: the same shells are 
also scattered through the brick-earth, with Ostrea edulis, Ros- 
tellaria Pes Pelecani, &c. At this locality a well was sunk 
to the depth of forty feet, and Ostree and Rostellarie were still 
brought up; but the oysters were most abundant at the depth 
of three or four feet from the surface. ‘Two fragments of the 
grinding teeth of the Oz, and small portions of bone, were 
also found in the blue clay, at the depth of five feet. 
At East Walton, Ostree, Turbo littoreus, and fragments of 
a Pecten are turned up by the plough; in a pit they may also 
be seen imbedded in a light-coloured alluvial clay, rising 
abruptly from the valley of the Nar to the height of eighty 
feet above the level of the river: the shells are much more 
broken than those found in the blue clay, situated at a lower 
level ; indeed, in the latter situation but few are at all injured. 
At Walton Stocks the same shells were also found. 
At Narford, near the Hall, in the same fetid blue clay as at 
Bilney, Ostrea, accompanied by Rostellaria, were discovered 
beneath a considerable bed of sand and loam; the clay was 
sunk through at the depth of twenty-seven feet, and in its 
lowest portion teeth and vertebree of the Asiatic Elephant 
were found: this is the most inland extremity of this deposit 
at present detected. The shells of the same deposit have also 
been found at a brick-yard in East Winch, covered by seven 
feet of sand and loam: beneath these lie a light-coloured ar- 
gillaceous earth, six feet in thickness, containing a few shells, 
which reposes upon the blue clay, in which the Ostree, Ros- 
