White Cairn - interpretation board. This small neolithic chambered cairn was excavated in 1949 and subsequently gave its name to a sub-group of passage graves in which the burial chamber and the passage form a single undifferentiated unit - the Bargrennan group, found only in south-west Scotland. Cremated bones and sherds of neolithic pottery were found in the passage. Further excavations were carried out in 2004 and 2005, and a burial cist and pot, as well as a separate early bronze age burial pot and other artefacts were discovered on either side of the passageway. Late mesolithic flints were also discovered around the edge of the cairn, suggesting human activity at the site over thousands of years of prehistory.