West Cornwall - Geology
Raised Beach - Porth Nanven (S17)
Nanven is an unusual type of raised beach - a raised boulder beach.
Smooth granite boulders of varying sizes deposited about 120,000 years ago when sea levels were higher
(12m) than now .
The raised beach is overlaid with angular frost shattered rocks from Periglacial tundra conditions -
continued freeze / thaw cycles weathering the rock - 10,000 to 100,000 years ago.
Lower sea levels and erosion have left the ancient beach suspended in the cliff high above the present sea level.
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Location - South of Cape Cornwall in Gallery 17
Ref: 2486
Date: 27/10/2015
Location: SW 3556 3092