Dún Briste at Downpatrick Head in Co. Mayo, Ireland
by Helen Glaves
Dún Briste at Downpatrick Head in Co. Mayo, Ireland was formed in 1939 when the arch connecting it to the mainland collapsed during a storm. This 45-metre tall sea-stack is composed of Lower Carboniferous fine-grained shales and sandy limestones, indicating deposition in a marine environment.
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Helen Glaves (distributed via imaggeo.egu.eu)