Where the more familiar earthwork ringforts of the Irish midlands relied on raised rims of soil and ditches, cashels are a feature of the west, where limestone and sandstone lie close to the surface and made stone the obvious material for enclosing a farmstead. The name Caherrush itself carries this history in plain sight, derived from the Irish cathair, meaning a stone fort or fortified place, a word that recurs along the Atlantic seaboard wherever early medieval farmers built in rock rather than earth.

Cashels of this kind were typically constructed during the early medieval period, roughly between the fifth and twelfth centuries, serving as enclosed farmsteads for a single family or small kin group. The circular or oval stone wall, sometimes several metres thick, defined both a practical and a social boundary, keeping livestock secure and marking out the household's claim on the land. County Clare is particularly dense with such monuments, partly because the Burren's exposed karst landscape made stone construction almost unavoidable, and the same geology that defeated the plough has preserved these walls in a way that softer ground rarely allows. The specific history of the Caherrush example, its dimensions, condition, and any associated features within the enclosure, remains to be fully documented in accessible form.