Arthur's Seat by Brian Negus
"... a hill for magnitude, a mountain in virtue of its bold design"
Robert Louis Stevenson
Like the castle rock on which Edinburgh Castle is built, it was formed by an extinct volcano system of Carboniferous age (approximately 350 million years old), which was eroded by a glacier moving from west to east during the Quaternary (approximately the last two million years), exposing rocky crags to the west and leaving a tail of material swept to the east.
Wikipedia
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