Helen's series. The white and green marls of the Headon
series, and some of the accompanying limestones, often resemble the Eocene
strata of France in mineral character and colour in so striking a manner as to
suggest the idea that the sediment was derived from the same region or produced
contemporaneously under very similar geographical circumstances.
(FIGURE 180. Solenastraea cellulosa, Duncan. Brockenhurst.)
At Brockenhurst, near Lyndhurst, in the New Forest, marine strata have recently
been found containing fifty-nine shells, of which many have been described by
Mr. Edwards. These beds rest on the Lower Headon, and are considered as the
equivalent of the middle part of the Headon series, many of the shells being
common to the brackish-water or Middle Headon beds of Colwell and Whitecliff
Bays, such as Cancellaria muricata, Sowerby, Fusus labiatus, Sowerby, etc. In
these beds at Brockenhurst, corals, ably described by Dr. Duncan, have recently
been found in abundance and perfection; see Figure 180, Solenastraea cellulosa.
Baron von Konen has pointed out that no less than forty-six out of the fifty-
nine Brockenhurst shells, or a proportion of 78 per cent, agree with species
occurring in Dumont's Lower Tongrian formation in Belgium.
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