But
it also appears that the mineral operations of the globe, melting and
consolidating bodies, had been exerted upon those deposited strata above
the vertical bodies.
This appears evidently from the examination of our pudding-stone. The
vertical strata under it are much broken and injected with ferruginous
spar; and this same spar has greatly penetrated the pudding-stone above,
in which are found the various mineral appearances of that spar and iron
ore.
But those injecting operations reach no farther up among the marl strata
in this place; and then would appear to have been confined to the
pudding-stone. But in another place, about half a mile farther up the
river, where a very deep section of the strata is discovered, there
are two injections from below; the one is a thin vein of whin-stone or
basaltes, full of round particles of steatites impregnated with copper;
it is but a few inches wide, and proceeds in a kind of zigzag. The other
appears to have been calcareous spar, but the greatest part of it is now
dissolved out. The strata here descend to the bottom of the river, which
is above the place of the pudding-stone and vertical strata.
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