A form of megalithic chamber tomb found mainly in Ireland, but with outliers in Wales and Cornwall. It had an above-ground chamber consisting of a heavy capstone supported by three or more uprights in a way that made the capstone slope down from front to back - becoming narrower and lower towards the rear. It was approached through two tall portal slabs which formed a miniature porch or forecourt. The entrance to the chamber is often blocked by a slab which may reach right up to the capstone. The scarce grave goods are similar to those from the court cairns, and both types of tomb are early within the Neolithic period, with dates close to 3800 BC.