Once upon a time , between 410 and 350 millions of years before present, it was the Devonian.
Devonian is a geological epoch belonging to the Paleozoic period. In the former classification, it was in the middle of the primary period.
Devonian is after Silurian and followed by Carboniferous. During Devonian, the continents are quite different in the size and shape than today. During this epoch, sands and muds among montains are deposited by large rivers systems. Basins received large thickness of sediments (Old Red Sandstone).
After that, during Carboniferous, other layers of sediments covered the Devonian one.
After millions of years, the tectonical movements made the actual continent and the old sea floor goes outside the water and begins to be eroded. That's what append here ! The Carboniferous layer has been totally eroded at Sheep's Head and it's now the turn of the Devonian layers that we could see here.

Erosion consist of alteration, modification or destruction of rock by different means. The erosion could be chemical or physical (mecanical).
Chemical erosion is due, for example, to marine salt or organic decomposition of plants.
Physical erosion is due to wind, rain, freeze.
Erosion is not an homogeneous process. The hardest part of rock resists longer to the elements. With chemical erosion, it could drive to holes, alveols or taffone.

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