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Museum, in Keswick. More recently, sets, extended to a greater
compass, have been exhibited in London, Liverpool, and other
places with great success.
Rocks of this description have sometimes been represented as
stratified, and the strata parallel to the slaty cleavage; but
this proposition should not be received without some hesitation.
If it be supposed that these varieties of rock, between which
there is no natural parting, have been deposited in the order in
which they have been mentioned; then, the strata may be said to
be mantle-shaped round the granitic nucleus; only interrupted in
continuity by the anomalous rocks of Carrock; but if it be
assumed that the stratification follows the slaty cleavage, then
it may be said to have its bearing tending towards the north-east
and south-west; dipping generally at a high angle to the
south-east, and presenting the edges of its laminae to the
surface of the granite, from the proximity of which the nature
and appearance of the rock must be presumed to be altered.
The rocks belonging to this division do not effervesce with
acids; they contain no calcareous spar, except a little in some
of the veins. They are sometimes intersected by dykes of a harder
kind of rock, apparently of the nature of trap or greenstone.
Veins of lead ore occur in several places; and have been worked
between Skiddaw and Saddleback, in Thornthwaite, Newlands, and
Buttermere, opposite the inn at Scale-hill, and below the level
of Derwent Lake. A copper mine had formerly been worked to a
great depth in a hill called Gold Scalp, in Newlands, and is said
to have produced a very rich ore, which appears to have been the
yellow sulphuret, or copper pyrites. This has lately been re-
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