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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: themselves in this layer of secondary formation, were composed
of sandstone and schistous rocks. But tightly packed between these
useless strata ran valuable veins of coal, as if the black blood
of this strange mine had circulated through their tangled network.
These fields extended forty miles north and south, and stretched
even under the Caledonian Canal. The importance of this bed could
not be calculated until after soundings, but it would certainly
surpass those of Cardiff and Newcastle.
We may add that the working of this mine would be singularly
facilitated by the fantastic dispositions of the secondary earths;
for by an unaccountable retreat of the mineral matter
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