Liathach from Na Rathanan (The Horns of Alligin), Beinn Alligin.

Liathach from Na Rathanan, Beinn Alligin.

 

Note the light upper layer of quartzite on top of the older Torridonian sandstone.

 

The Torridonian sandstone is a staggering 1000 to 800 million years old.

 

There is a large age gap between the Torridonian sandstone and the quartzite. The dividing line between the two rock layers is called an unconformity by geologists.

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