3Kenny, Niall. "Dingle's Minard Beach." Archaeology Ireland 20.4 (2006): 16-20.
From the article: "The stones that are still being rolled on the beach today are freshly pink, devoid of lichen growth, and are quite dark in appearance because they are wet. This is how such ogham stones would have looked when they were first procured from the beach, and makes one wonder whether the shape, colour and texture of the stones might have been important factors in the choice of material to be inscribed. The use of the water-rolled pulvinar stones from Minard Beach as ogham monuments at various locales in the surrounding area suggests possible links between different places in the early historic landscape. We can begin to see how people sourced this particular material, the places they brought it to and the contexts in which they erected and used such stones...Identity Ogham stones are culturally fixed and enduring points in the landscape. They were almost certainly intended as permanent markers of place that would fix in the soil a part of the identity of those who erected them. This identity would have been evident in the inscriptions through the use of an individual, family or group name. Considering that most people at this time would not have been literate, however, we can say with confidence that this identity would also have been bound up with, and in some ways more potently expressed in, the type, colour, shape and material properties of the actual stone upon which the ogham was inscribed."
More information and an example may be found here. Others sites in Voices from the Dawn feature ogham inscriptions, including the Kilmalkedar and the Ballycrovane stones.