The area was subject to glaciation during the ice ages. The glacial meltwater evidence coincides with an area to the south and east of Kilflynn and the N26 road, broadly in line with the edge of the hills facing the north-west. The ice sheet that covered Ireland split about 19,000 years ago, along a corridor that included the area where Kilflynn lies and going down past Banna Strand (the sea level was lower then) towards the Atlantic. The main ice sheet retreated northwards, separated from the Kerry-Cork ice cap to the south which disappeared approximately 1000 years later.