Irish megalithic tomb consisting of a rectangular, trapezoidal, or D‐shaped cairn with a long narrow chamber opening into the cairn from the wider higher side. With no separate entrance passage, the chamber is typically constructed of orthostatic walls supporting massive capstones forming the roof. Generally the chamber decreases in height towards the back. There is a slight tendency for the tombs to face west. Burials are mainly multiple cremation; grave goods are rare. Dated examples cluster in the period 2300–1800 bc, the late Neolithic, although many were later reused as burial places.