During the excavation of certain deep dykes for the purpose of
draining the fens there was discovered at a depth of about 10 feet
below the surface a forest of oaks, with their roots imbedded in the
underlying Kimmeridge Clay. The trunks were broken off at a height of
about three feet. Some of the fallen trees were of fine proportion,
measuring three feet in diameter, quite straight and seldom forked.
At an average height of two feet above this “forest No. 1” the
remains of another were found (in the peat) consisting of oaks and
yews. Three feet above “forest No. 2” lay the remains of another, in
which the trees are all Scotch firs, some of which were three feet in
diameter. Above this and near to the surface was seen a still newer
forest of small firs. The peat close to the surface contains remains
of sallow and alder, and was formed with the sea at its present level.
It will be noticed that the greatest depth at which these rooted
trees were found was only about ten feet below the sea-level. At
this high level we must expect to find that the growth of the peat
was practically continuous, and that the different submerged forests
run together. In adjoining depressions the different forests would
occur at lower levels and would be separated by beds of marine silt.
It does not follow from the position that a low-level submerged
land-surface is older than one at a higher elevation, for above the
present sea-level all these stages are represented by a few inches
of soil, on which forest after forest has grown and decayed. Anyone
who has collected antiquities on fields knows what a curious jumble
of Palaeolithic, Neolithic, bronze age, Roman, mediaeval and recent
things may be found mixed in these few inches of soil, or may be
thrown up by an uprooted tree. The great advantage of studying the
deeply submerged forests is that in them the successive stages are
separated and isolated, instead of being mingled in so confusing a
fashion.
Public-domain text, read in full here on John Shaqi.
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