This well preserved ring fort has a perfectly circular shape. The name of the townland comes from Coill an Chaisil, Irish for "wood of the stone fort", so the ring fort gave the name to the townland.
The fort was built a few centuries before Christ.
The access is through a lintelled doorway on the east-southeast (100°) side. At the entrance the walls are 4.20 metres thick.
The inner diameter of the ring fort is about 28 metres, giving a total diameter of about 36 metres.
The top of the ring fort can be accessed via four sets of stone steps on the inner wall.
There are two wall chambers, one at the west-northwest (285°), the other one at the northwest (310°). Apparently a 7 metres long passageway joins the two chambers, but it was too dark inside to investigate.
On the area within the ringfort there are the remains of two stone houses.
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