| Weathering | |
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To the south of the Vatnajokull
icecap is Skaftafell National Park, and campsite. Mordalsdalur is
a valley just to its west, running north into the mountains from
the coastal plain (the sea is but three miles away). The valley
is unglaciated, but deep and cold, and filled with a powerful,
braided river. This rock was found at the valley side with well
developed and mortal cracks in it.
Skaweathering1.jpg (191321 bytes) August 1985 |
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Just a few hundred metres further
on this boulder had been completely reduced by frost-shattering,
or nivation. The constant dampness, and both daily and seasonal
temperature changes, have allowed the damp in the cracks to
freeze and then thaw, cracking the rock and leaving it in this
granular state! The moss is a good indication of this
alpine-like environment.
Skaweathering2.jpg (176811 bytes) August 1985 |
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Lincoln Cathedral
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The face of Lincoln Cathedral, with the older, weathered, fascia contrasting with the brand-new stone carvings recently installed.
800-03260039.jpg
26 March 2002 |
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.The full ravages of time can be seen on this detail of a carving, attacked by damp and wind .. and simply time. Various urban pollutants would have contributed , especially those from motor exhausts in the last century.
800-03260040.jpg 150KB
26 March 2002 |
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In Dedham High Street the church is separated from the road by this wall. The right hand side of the wall faces SSE; the left hand side faces NNW and is covered with moss. the stone itself is remarkably clean, and may be under acid attack from the atmosphere, and from under the moss or lichen, which also secretes weathering agents.
600-04060010.jpg 170Kb
6 April 2002 |
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