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'The rocks in which these Caves are formed are composed of coarse
limestone and marble, of various kinds of and colours, which
generally run in horizontal strata, from three to six feet wide:
the lowest is of a very fine quality, particularly the black, of
which there is a fine vein in Yordas Cave, but it is more
difficult to be got at than at Dent, where it is worked with
great success.
'This bed of calcareous rock is probably connected with that in
Derbyshire, as the same kind of marine petrifactions of animals,
no longer known to exist, occur in both. It is called transition
or mountain limestone, and caves are found in the same kind of
rock in various parts of the world.
'These Caves are supposed to be formed by water forcing its way
through natural fissures, and carrying the softer or broken parts
of the rock with it, as streams are found invariably to run
through them all.'
KIRKBY LONSDALE BRIDGE.- SOUTH VIEW
T. BINNS [del]
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