2006

NM4027 : Basalt Rock Formation

taken 18 years ago, near to Burgh, Isle of Mull, Argyll And Bute, Scotland

Basalt Rock Formation
Basalt Rock Formation
Taken on the way to the fossilised tree. I am indebted to Keith Burns for this explanation of the fascinating geological processes involved here :

"On the beach, basalt columns radiate from a central point on the
shore near the fossil tree. The columns are formed due to the cooling
effect of a standing tree on the lava flowing around the tree trunk.
The tree draws heat from the lava. When the lava shrinks, it forms
hexagonal shrinkage cracks which form columns whose axes are parallel to the
direction of heat flow. So the hexagonal columns radiate from the tree
trunk which is drawing heat from the lava.

If lava is in a level slab losing heat to the air above it, it cools from
the top down and forms the more familiar vertical hexagonal columns (e.g.
Giant's Causeway, Staffa, Sampson's Ribs on Arthur's Seat in Edinburgh).

There must have been a forest that was engulfed by the slowly flowing lava."

Creative Commons Licence [Some Rights Reserved]   © Copyright Mick Garratt and licensed for reuse under this Creative Commons Licence.
This photo is linked from: Galleries: · Volcanic Activity Automatic Clusters: · Fossil Tree [5] · Basalt Columns [4] · Fossilised Tree [2] · Lava [2] · Shore [2] ·
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NM4027, 12 images   (more nearby 🔍)
Photographer
Mick Garratt   (more nearby)
Date Taken
Sunday, 28 May, 2006   (more nearby)
Submitted
Sunday, 4 June, 2006
Subject Location
OSGB36: geotagged! NM 405 271 [100m precision]
WGS84: 56:21.8882N 6:12.2029W
Camera Location
OSGB36: geotagged! NM 406 270
View Direction
West-northwest (about 292 degrees)
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Image classification(about): Geograph (First for NM4027) · First in 5 Years (TPoint) (about)
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