The exposed limestone of the Aran Islands here transitions to a fertile field of grass, husbanded by generations of islanders. Photograph was taken from the path on Inishmore leading up to Dun Aonghasa.
The Aran Islands are an extension of The Burren of Ireland’s Counties Claire and Galway. The word burren is from the Irish Boireann, meaning “great rock.” The glaciers that covered Ireland, retreating about 10,000 years ago, scraped down to the bedrock, exposing wide areas of limestone and dropping, here and there, large rocks. When people came along the foreign nature of the large rocks was recognized, all the more obvious for lying on the horizontally bedded, exposed limestone. We call the foreign rocks erratics. The underlying scoured rock is a pavement for a resemblance to a cobbled roadway.
The incised line, filled with grass and wildflowers, in the following photograph is called a gryke. The body of stone between the grykes are clints. Sometimes, the grykes are cross hatched and the clints resemble cobblestones or flat paving stones.
The view is northeast toward the 12 Bens of Connemara. Inishmore, Aran Islands, County Galway, Ireland
Click the photograph for a larger view.
References: search wikipedia “The Burren” and Google “gryke”, “clint.”