These tiny yellow flowers, each with four petals, are called “Tormentil”. It is a fairly common Irish wild flower, found on a heaths, moorland and coastal regions. Its botanical name is: “Potentilla erecta”.
This one is seen sprawling across large limestone rocks near Dun Aengus Stone Fort on Inishmore in the Aran Islands. However it is not a limestone-specific plant – I have seen them on both peaty-acidic soil and on the limestone alkaline soils.
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Techie Photography detail:
Image Mode: Raw
Lens: EF24-70mm f/2.8L USM zoom (at 60mm),
Camera: Canon 5d MkII
Exposure: f16 1/200