This historic book may have numerous typos, missing text or index.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. 1839. Not illustrated. Excerpt:
... SANDSTONE, CONGLOMERATE, &C. 41 ficicnt evidences are
presented to the mind, that there was a period in the history of
this country, subsequent to the accumulation of sandstones, shales
and coal of the carboniferous period, when there existed such a
depression in this part of the great coal field, that its surface
was beneath the common sea level. Into this depression the detrital
matter, derived from pre-existing strata, was carried by water, and
there deposited in strata of sandstone and conglomerate, as they
are now seen in their consolidated state. The pebbles forming the
conglomerates have all been rounded by attrition; and, in. figure,
are like those which have undergone the action of water, along sea
coasts, or where fragments of rocks are exposed to the wearing
influence of currents. Even the sources from which those pebbles
were brought, are, in some instances, discoverable; and thus it is
seen, that causes still active upon the earth, were in operation at
remote periods in its history. The mixture of these pebbles with
sand, their position, their variety and figures all prove, that
their history is identical with those of the loose beds, now found
upon the surface and along the coasts. The sandstone and marl are
only the same materials, in a more finely comminuted state. They
were longer exposed, or, from their original chemical composition,
they might have been more readily broken, or were exposed to the
more violent effects of the element beneath which they were lodged;
afterwards to form the solid mountain and fertile field, where they
are again undergoing the same disintegrating process, which they
had previously endured. It is by these natural operations that the
earth has been rendered productive, and its once solid, barren and
almost impervious ...
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|Country of origin:
||246 x 189 x 5mm (L x W x T)
||Paperback - Trade
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