74 CONTRIBUTIONS TO PLEISTOCENE GEOLOGY
Still further to the north the following section is seen :—
Sand.. .. .. .. ..8ft.
Gravel.. .. .. .. .. 6in. to 1 ft.
Thanet Sand .. .. .. .. 5ft.
Bull's Head bed .. .. .. .. 6in.
Chalk
FIGURE 3.—SECTION IN THE GRAYS CHALK QUARRIES.
1.=Pebbly loam—"Landwash." 3.=Well-bedded coarse gravel,
2.=Clay, much contorted. 4.=Thanet Sand, with "Bull's Head Bed "
resting on Chalk.
From this point the character of the section changes, for we
meet with no more evidence of the underground dissolution of
the chalk. A yard or so further on a very fine section is exposed
in the side working, of which fig. 3 will give a good idea. The
importance of this section is that it shows that the upper beds
are contorted, and that this feature is not due to the dissolution
of the chalk, because the beds between them and the latter are
not disturbed at all. The clay has acted here as a protective
cap to the chalk. The gravel thins out to the north and east,
its place being taken in great measure by fine false-bedded
brown sand with seams of darker reddish-brown clay. The
upper bed is uniformly a reddish-brown clay. If the details of
this part of the section are compared with Mr. Holmes' account
of the subsidence section, the two are seen to correspond very
closely.
These beds are exposed for a considerable distance. The
sections show them longitudinally along the line of the