What makes the site at Cahermacrusheen quietly odd is not just its age but its layering: an early medieval cashel, a later drystone field wall built around it, and the remnants of a house site right in the middle of the interior, each element occupying the same modest patch of rough pasture as though the landscape simply kept recycling itself.

A cashel is a type of ringfort defined by stone rather than earthen banks, and this one follows the form closely: a roughly circular plan with an internal diameter of around 19 metres and an external diameter of just over 25 metres, its defining wall now a spread of stone between 3.3 and 3.5 metres wide. The wall survives to an internal and external height of only 0.2 to 0.4 metres, so it reads less as a wall than as a thickening of the ground. The site was already being recorded in the mid-nineteenth century, appearing on the Ordnance Survey six-inch map of 1842 and again on the 1920 edition. By 1996 it had been listed in the Record of Monuments and Places, though under the somewhat flat designation of "Enclosure". The surrounding drystone wall, added at some later point, survives in fragments ranging from 0.4 to 1 metre in height, suggesting it was once a functioning field boundary before it too fell into disrepair.

The blackthorn overgrowth that now obscures much of the cashel is itself a kind of record, marking a place that has not been actively managed for some time. The house site at the centre adds another layer of human presence to a spot that has, at various points, served as a defended enclosure, a field boundary, and a domestic dwelling. The outcropping limestone that breaks through the surrounding pasture is characteristic of the Burren fringe, where the geology tends to assert itself through whatever thin soil covers it.