The Cyrena-bed varies from 4 feet to 6 feet (D, fig. 29) in thickness, and consists of false-bedded sand containing a great number of
small and delicate shells in a perfect state of preservation.
Fig. 30 exhibits the series of gravels in the Stoke-Newington pit,
Fig. 30.—Section in Stoke-Newington Pit.
which is 43 feet deep. The bottom consists of yellow false-bedded
sands, passing upwards into a series of stratified brick-earths and
clays with veins of gravel. The covering bed, k, is indented into
the brick-earth, j it is from 6 to 8 feet thick, composed of large flints in
stiff brown clay, and forms a marked contrast to the finely laminated
loams and clays forming the 30 feet below it, c-k. The bed f is a
black peaty clay; and the shells in the list from Stoke Newington are
found in brick-earth and clay above this black bed in the adjoining pit.
The covering bed reaches a height of 125 feet above the Ordnance
datum-line, and is within 300 yards of the escarpment of the London
Clay to the north. Where the London Clay is visible to the north,
