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13th July 2006, Thursday |
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ARRAN - CLAUCHLANDS
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Tour:
Self |
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Weather:
Showers and
some sunshine. |
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Summary of Visit:
A
visit was made to look at the Permian desert sandstones between
Brodick and Lamlash on Arran. The dykes and sills of
the area were also examined.
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The Clauchlands Sill (top) and the
"Great Pitchstone" Sill (bottom), intruding Permian sandstones
between Clauchlands Point and Corrygills Point. The
Clauchlands Sill is about 40 feet thick, and the Great Pitchstone
Sill about 12 feet.
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The northern end of the "Mile Dyke", looking towards the granite
hills around Goatfell. This dolerite dyke runs parallel to the
shore for almost a mile. Here, it occupies the hollow and has
been eroded, leaving the adjoining baked sandstones standing out as
wall features. |
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The pitchstone of the Great
Pitchstone Sill, an extremely fine grained, bottle-green rock, with
a resinous lustre. It contains scattered needles of microlites
and feathery growths made up of small cristallites in a glassy
matrix. |
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