Castle on the Rock - Edinburgh
by Yvonne Johnstone
Title
Castle on the Rock - Edinburgh
Artist
Yvonne Johnstone
Medium
Photograph - Digitally Enhanced Photograph
Description
Castle Rock is a volcanic plug formed in the Carboniferous period (340 million years ago).
It towers above Edinburgh’s Old Town and West Princes Street Gardens giving the Castle a clear defensive advantage.
The dolerite rock formed as part of an ancient volcanic complex that underlies the heart of the city.
The surrounding sedimentary rocks have since been scraped off on all but the eastern side where they form the gently sloping Royal Mile.
This is known as a crag-and-tail formation and is testament to the glacial erosion that changed Edinburgh’s landscape so dramatically.
To the north a loch was formed while the south offered stable ground on which to build Edinburgh’s old town and now forms the Grassmarket.
Uploaded
February 16th, 2021
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