But if we were to attach importance to such occasional
passages, we should soon find that no lines of division could be drawn anywhere,
for in the present state of our knowledge of the Tertiary series there will
always be species common to beds above and below our boundary-lines.
BARTON SERIES (SANDS AND CLAYS), A.4 TABLE 16.1.)
(FIGURE 181. Chama squamosa, Eichw. Barton.)
Both in the Isle of Wight, and in Hordwell Cliff, Hants, the Headon beds, above-
mentioned, rest on white sands usually devoid of fossils, and used in the Isle
of Wight for making glass. In one of these sands Dr. Wright found Chama
squamosa, a Barton Clay shell, in great plenty, and certain impressions of
marine shells have been found in sands supposed to be of the same age in
Whitecliff Bay. These sands have been called Upper Bagshot in the maps of our
Government Survey, but this identification of a fossiliferous series in the Isle
of Wight with an unfossiliferous formation in the London Basin can scarcely be
depended upon. The Barton Clay, which immediately underlies these sands, is seen
vertical in Alum Bay, Isle of Wight, and nearly horizontal in the cliffs of the
mainland near Lymington.
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