I never
before had data from whence to reason with regard to the natural history
of those masses of gravel and sand which always appeared to me in an
irregular shape, and not attended with such circumstances as might give
light into their natural history; but now I have found what I think
sufficient to explain those obscure appearances, and which at the same
time will in some respect illustrate or confirm the conjecture which
has now been formed with regard to the operations of the globe in those
regions.
In describing the vertical and horizontal strata of the Jed, no mention
has been made of a certain pudding-stone, which is interposed between
the two, lying immediately upon the one and under the other. This
puddingstone corresponds entirely to that which I had found along
the skirt of the schistus mountains upon the south side, in different
places, almost from one end to the other. It is a confused mass of
stones, gravel, and sand, with red marly earth; these are consolidated
or cemented in a considerable degree, and thus form a stratum extremely
unlike any thing which is to be found either above or below.
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