Corrie is a small village on the east coast of Arran, not far north of Brodick. The rocks here range from the Devonian (north of the village) to the Permian (to the south). There are also some basaltic lavas dating from the Carboniferous, but on this shore these are not visible, being overlain by weathered boulders and stones.
When looking at changes in rocks through time, it is often best to start with the oldest rocks and walk up through the succession, but for reasons that will become apparent later, this story starts in the Permian and journeys back through time.
In the Permian, the bit of land that is now Arran was north of the equator, at a similar latitude to today's
Sahara desert, and had a generally arid climate with only occasional rainfall.
The rocks on the foreshore are red, with large scale cross bedding in places, and with frosted and rounded grains – all clues to generally aeolian deposition. There are some sections showing only planar bedding, which may represent sheet floods in a temporary fluvial setting.
|Permian rocks just south of Corrie, Arran.|
|Changes in bedding|