Here, an intumescence which was to become
a mountain, there, an abyss which was to be filled with an ocean
or a sea. There, whole forests sunk through the earth's crust,
below the unfixed strata, either until they found a resting-place,
such as the primitive bed of granitic rock, or, settling together
in a heap, they formed a solid mass.
As the waters were contained in no bed, and were spread over every
part of the globe, they rushed where they liked, tearing from
the scarcely-formed rocks material with which to compose schists,
sandstones, and limestones. This the roving waves bore over
the submerged and now peaty forests, and deposited above them
the elements of rocks which were to superpose the coal strata.
In course of time, periods of which include millions of years,
these earths hardened in layers, and enclosed under a thick
carapace of pudding-stone, schist, compact or friable sandstone,
gravel and stones, the whole of the massive forests.
And what went on in this gigantic crucible, where all this
vegetable matter had accumulated, sunk to various depths?
A regular chemical operation, a sort of distillation.
All the carbon contained in these vegetables had agglomerated,
and little by little coal was forming under the double influence
of enormous pressure and the high temperature maintained by
the internal fires, at this time so close to it.
Pages:
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31