One of the most interesting of the submerged forests seen between
tide-marks on the French coast was that discovered a few years
since by Monsieur Emil Gadeceau in Belle Ile. This island lies off
the mouth of the Loire, and its position some way from the coast and
well out in the Atlantic induced him to make a special study of its
flora. While engaged in this, his attention was drawn to certain hard
peaty deposits seen only at low tide, and he asked me to undertake
the examination of the seeds found in them. This work was gladly
undertaken, as it carried further south the examination which was
then being made into the flora of the submerged forests.
The results were somewhat surprising; out of about 30 species
sufficiently well preserved for identification, six were no longer
living in Belle Ile, though known in Western France. The whole
flora might have come from the north of England, characteristic
French species being entirely missing, though this element is fairly
represented in the living flora of the island. In short, the flora
is a northern one, though in no degree arctic, and in this it agrees
well with the poor assemblage commonly found in the submerged forests
of the south of England.
From still further south, at various points on the shores of the Bay
of Biscay, and from the submerged peaty deposits which underlie the
Landes, seeds have since been collected by my friend, Professor Jules
Welsch, of Poitiers. These also all belong to common living British
plants, except that at Brétignolles, south of latitude 47°, we
meet for the first time one characteristic southern plant—the vine.
Unfortunately the search for traces of man and his works in these
deposits has so far been unsuccessful, and we cannot yet be certain
therefore that they are all of quite the same date, or correspond
exactly with the submerged forests of Britain.
CHAPTER VIII
SUMMARY
To what conclusions do the foregoing somewhat monotonous pages lead?
Do they help us to explain the origin of our fauna and flora? What
light do they throw on the antiquity of man in Britain, or on the
race problems that everywhere confront us? Can the deposits therein
described be in any way connected with written history or with
legend? Do they give us any approach to a measure of geological time?
And, to what extent does the period of the submerged forests tie on
historical times with the Glacial Epoch?
All these questions are connected with the subject-matter of this
little book; but it is not written with the idea of showing how much
we know or pretend to know. Our main object is to draw attention
to a much neglected period in geological history and to suggest
directions in which further research is likely to be profitable. We
have, however, made out several points, and can give an approximate
answer to some of the questions.
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