That is, formally speaking, almost all that is currently known about it in the public record. It has been identified, catalogued, and given a monument number, yet the details that would normally accompany such a designation, its age, its shape, its likely purpose, remain locked away from casual inquiry. For a county whose landscape is dense with ringforts, enclosures, field boundaries, and the occasional more mysterious raised feature, the bare classification of "earthwork" could mean almost anything.

Earthworks as a category cover considerable ground, so to speak. They include the remains of ringforts, which were enclosed farmsteads typical of the early medieval period, as well as burial mounds, territorial boundaries, and agricultural features whose origins range from the Bronze Age to the post-medieval era. Clare is particularly well furnished with such survivals, many of them sitting quietly in fields, unremarked by passing traffic, their profiles softened by centuries of grass and weather. Carrow, like many Irish townland names, likely derives from the Irish word "ceathrú", meaning a quarter division of land, a unit used historically to describe portions of territory within the Gaelic land system. Whether the earthwork relates to that kind of administrative boundary-making, or to something older and more ceremonial, is precisely what the surviving record does not yet say.