NM4862 : Cone Sheets on the Foreshore

taken 4 years ago, near to Kilchoan, Highland, Great Britain

Cone Sheets on the Foreshore
Cone Sheets on the Foreshore
The cone sheets here seem to be curving more than usual, forming a low rampart round some rocky pools.
Cone Sheets
Cone sheets are formed by magma penetrating arcuate cracks around the centre of a volcano as it subsides. Unlike ring-dykes, which dip outwards, cone sheets dip inwards towards a central point or focus.

West of Mingary Pier is a series of cone sheets which is one of the best examples, if not the single best example, in the world; a geological locality of international importance.

There are two swarms of cone sheets associated with Centre 2 of the Ardnamurchan volcano, one swarm older than the other. The individual sheets are quite thin, few being more than 6 metres thick, but adding them all together their total thickness is about 1300 metres - which gives an inkling of how numerous they are.

The cone sheets exposed west of Mingary dip at angles of about 35 to 45 towards a focus somewhere near Sonachan. They are mainly composed of quartz-dolerite or basalt, though some are composite and a few felsic sheets do exist. They cross, join and split off from one another, and are cut by later basic dykes.

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NM4862, 6 images   (more nearby )
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Date Taken
Saturday, 14 September, 2013   (more nearby)
Tuesday, 17 September, 2013
Geographical Context
Coastal  Geological interest 
Subject Location
OSGB36: geotagged! NM 4894 6289 [10m precision]
WGS84: 56:41.4044N 6:6.1013W
Camera Location
OSGB36: geotagged! NM 4899 6299
View Direction
South-southwest (about 202 degrees)
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Image classification(about): Geograph
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