Discourses: Biological & Geological: EssaysHuxley, Thomas Henry
Science
Discourses: Biological & Geological: Essays
Huxley, Thomas Henry
Biology; Geology
The existence of these people is forgotten even in the traditions of the
oldest historical nations. The name and fame of them had utterly vanished
until a few years back; and the amount of physical change which has been
effected since their day renders it more than probable that, venerable as
are some of the historical nations, the workers of the chipped flints of
Hoxne or of Amiens are to them, as they are to us, in point of antiquity.
But, if we assign to these hoar relics of long-vanished generations of
men the greatest age that can possibly be claimed for them, they are not
older than the drift, or boulder clay, which, in comparison with the
chalk, is but a very juvenile deposit. You need go no further than your
own sea-board for evidence of this fact. At one of the most charming
spots on the coast of Norfolk, Cromer, you will see the boulder clay
forming a vast mass, which lies upon the chalk, and must consequently
have come into existence after it. Huge boulders of chalk are, in fact,
included in the clay, and have evidently been brought to the position
they now occupy by the same agency as that which has planted blocks of
syenite from Norway side by side with them.
The chalk, then, is certainly older than the boulder clay. If you ask how
much, I will again take you no further than the same spot upon your own
coasts for evidence. I have spoken of the boulder clay and drift as
resting upon the chalk. That is not strictly true. Interposed between the
chalk and the drift is a comparatively insignificant layer, containing
vegetable matter. But that layer tells a wonderful history. It is full of
stumps of trees standing as they grew. Fir-trees are there with their
cones, and hazel-bushes with their nuts; there stand the stools of oak
and yew trees, beeches and alders. Hence this stratum is appropriately
called the "forest-bed."
It is obvious that the chalk must have been upheaved and converted into
dry land, before the timber trees could grow upon it. As the bolls of
some of these trees are from two to three feet in diameter, it is no less
clear that the dry land thus formed remained in the same condition for
long ages. And not only do the remains of stately oaks and well-grown
firs testify to the duration of this condition of things, but additional
evidence to the same effect is afforded by the abundant remains of
elephants, rhinoceroses, hippopotamuses, and other great wild beasts,
which it has yielded to the zealous search of such men as the Rev. Mr.
Gunn. When you look at such a collection as he has formed, and bethink
you that these elephantine bones did veritably carry their owners about,
and these great grinders crunch, in the dark woods of which the forest-
bed is now the only trace, it is impossible not to feel that they are as
good evidence of the lapse of time as the annual rings of the tree
stumps.
Public-domain text, read in full here on John Shaqi.
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