Illustrations of the Huttonian Theory of the EarthPlayfair, John
Science
Illustrations of the Huttonian Theory of the Earth
Playfair, John
Geology; Hutton, James, 1726-1797. Theory of the earth
225. Mere words should have little power to mislead, in a science which
treats of sensible objects, such as are always easily subjected to the
examination of sight or of touch; yet there is some appearance as if
the Neptunists were misled in this, and other instances, by the term
_stratification_. Though an incrustation on the perpendicular face of a
rock has very little affinity to a stratum, such as we are accustomed
to see deposited by water, yet the same name being once imposed on
both, mineralogists have proceeded to reason concerning them, as if
they were precisely the same thing, and were both to be ascribed to
the same cause. Indeed every perpendicular or highly inclined bed of
stone, is inexplicable as an effect of aqueous deposition, in a system,
unprovided, as the Neptunian is,[118] with the means of raising up
such beds from a horizontal into a vertical position. This observation
may also be extended to all cases of vertical stratification. Water
cannot directly arrange its deposits in planes highly inclined, and
therefore I have often wondered to see the Neptunists contending so
eagerly for the stratification of certain rocks, such as granite,
which, being vertical, or highly inclined, was much less friendly to
their system than the entire absence of all stratification would have
been. I was disposed to admire their candour, when the use which
they made of the fact convinced me, that I ought only to wonder at
their inconsequential reasoning. The Huttonian Theory is, indeed, the
only one which possesses the means of reconciling the elevation of
the strata with their horizontal deposition, and which is entitled to
consider stratification, in whatever plane it may be, as originally the
work of the ocean. The geologists who attach themselves exclusively to
the action of water, will never be able to extend the dominion of that
element so far as Dr Hutton has done, by combining it with fire.
[Footnote 118: See preceding note.]
226. But, though the Neptunian system were provided with engines,
powerful enough to raise up strata from a level to a vertical plane,
this would avail nothing in the present instance; since, on no
supposition, can the incrustations on the perpendicular sides of a
vein have ever been horizontal. On no supposition, therefore, can
these incrustations be received as a proof of aqueous deposition: it
may indeed be certainly inferred from them, that the matter which they
consist of was fluid at the time of their formation; but the absence of
all appearance of a horizontal disposition, in any part of the vein,
amounts nearly to a demonstration, that this fluidity did not proceed
from solution in a menstruum. We must therefore conceive the coats
to have been formed during the refrigeration of the melted matter
injected from the mineral regions into the clefts and fissures of the
strata. (§ 59.)
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