Field systems of this kind are among the least glamorous categories of archaeological monument, easy to overlook precisely because they look, at first glance, like ordinary countryside. But they are often among the oldest human interventions visible on the surface of the land, and in the west of Ireland many date to the Bronze Age or earlier, preserved under blanket bog or simply left undisturbed on marginal ground that later farming never found worth improving.

Cooga is a small rural townland, and without more detailed records it is not possible to say when this particular field system was in use, by whom, or what form it takes on the ground. What is known is that it has been identified and recorded as a monument, which means it carries legal protection and has been judged to be of archaeological significance. Field systems can take many forms: low earthen banks, stone-built field walls, lazy beds left by spade cultivation, or the faint corrugations of ridge-and-furrow. Each type tells a different story about the people who worked the land and the methods they used.