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Abstract
During the fieldwork of the Geological Survey of Sweden for a rock map of Norrbotten a gathering of conglomerate boulders was discovered at Västra Gräddman-hällan situated about 20 kilometres south of Kalix in the Kalix archipelago. The conglomerate consists of pebbles of the rocks of the Kalix series. The find is compared with earlier known conglomerate boulders at Malören and the Kieksi conglomerate at the Ule River in Finland. These three conglomerates are supposed to be of Jotnian age. A fossiliferous boulder from the Kalix archipelago, described by K. E. Mars in 1917, has surely been transported here as ballast.