Unlike the more familiar portal tombs or wedge tombs, a boulder-burial is exactly what the name suggests: a large, often rounded boulder placed directly over a small cairn or pit, sometimes covering a cist, the stone-lined box grave that Bronze Age communities used to inter their dead. They are concentrated mainly along the Atlantic seaboard, particularly in Cork, Kerry, and Galway, and their relative simplicity can make them easy to overlook or misread as a natural feature of the terrain.

The Larragan example belongs to this sparse but geographically coherent group of monuments, most of which date broadly to the Bronze Age, roughly 2500 to 500 BC. The form seems to represent a local or regional tradition of burial practice, one that used the weight and presence of a single great stone in place of the more elaborate architectural grammar of earlier Neolithic tombs. Why certain communities chose this method over others remains an open question, and the Galway examples in particular have not always received the same degree of excavation or documentation as their counterparts further south.