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Knowth 4 Knowth 4 was rediscovered by excavation, as nothing remained on the surface. This site was sizeable at about 17 meters in diameter with an undifferentiated passage/chamber about 8 meters long. Some 20 sockets showed where the orthostats had stood, some of which contained packing stones which would have been used to keep the top of the kerb level. There were six settings or arcs of stone laid out on the old ground level, similar to Carrowmore 1 and 27. Some 10 kerbstones were found, only 3 of which remained in their original positions. Inner sillstone, both surfaces. The passage was divided by sillstones, and the innermost sill was unusually high, and decorated on both sides and on the top. It was the only engraved stone found there. A large circular setting was found outside the entrance. It measured more than 2 meters in diameter and was paved with quartz and surrounded by 2 concentric rings of smaller stones. The passage appears to be aligned to the northeast, and may mark a rising lunar standstill.