Like in many places of Ireland, datable Iron Age sites are rare in The Burren. This may be due to the use of dwellings that did not leave durable traces (wooden buildings or even tents). Some of the extant ráths, cashels or cahers may actually have Iron Age origins. However, few have been excavated and those that have been the subject of research, like Cahercommaun, Caherconnel, Cahermore or Ballyallaban, are thought to be early Medieval or later in origin. The large enigmatic enclosure of Turlough Hill (see Oughtmama) may be Iron Age or earlier. Definite regional findings from this era are limited to a few bronze horse bridles discovered near Corofin and at Ballyalla (Kilshanny).