Location: Ederline Boathouse
Map reference: NM 883 039
Date of Survey: 22 September 1972
Loch level OD: 35.509 m
Highest point of crannog OD: 36.409 m
Usable area: 25 m x 18 m
Description (1972): Flat sandy bottom with bedrock ridge NE-SW which continued into crannog and protruded out of the top on the NE side. Grass and shrubs on the highest part, to SW end.
Several heaps of head-sized stones and a general scatter lay around and against the south side of the bedrock ridge underwater, as if stone facings had been started but not finished. Further heaps of stones lay to the ESE, S and to the N of the crannog, 6-10 m from the base of the slope.
The crannog itself was steep-sided, built of random-shaped stones which a man could comfortably lift.
Timber was visible in the bottom around the crannog:
To NE side of crannog a hollowed-out area among the stones which suggested a slipway or 'harbour' for a boat, with a scatter of smaller stones on the bottom. At its inner end three stones were set on edge and another long stone lying outside them.
Three metres further toward centre of crannog a flat stone was set on edge among the surface stones.
Dating: The two quernstones would suggest a later prehistoric date, probably pre-Roman Iron Age
Post-1972: Later sampling of two of the upper timbers gave C14 dates, which show this part of the crannog in use in the Iron Age:
¶ 2004, July: A trial excavation (3m x 5m, north side, in ca 3m of water) was carried out. Organic deposits, animal bones and a sherd of E ware showed this part of the crannog to be later in date, nicely confirming early map illustrations of crannogs in use up to the Middle Ages: see Cavers and Henderson
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Difference in loch levels: normal (above) and in September 1972 (below)
Crannog 20 from the east
Much of top of crannog 20 was out of water due to the unusually low loch levels Summer 1972
Large oak log among other timbers; note slot far end. Scale 10 cm
Broken saddle quern (above). Below: edge of saddle quern, above broken rotary quern
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