Landscapes Dun Briste
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Copyright: Geological Survey Ireland
Image Size: 1280 x 1024    Uploaded on: 29/01/2009
County: Mayo   Rating: 

Licence: Creative Commons Licence

Dun Briste, a sea stack, off Downpatrick Head. A stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast. Stacks are formed when part of a headland is eroded by hydraulic action, which is the force of the sea or water crashing against the rock. The force of the water weakens cracks in the headland, causing them to later collapse, forming a stacks and small island. They also form when a natural arch collapses due to sub-aerial processes and gravity.

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