Members of the Coll Archaeology Association Shorewatch group visited the island
of Eilean Ornsay with its owner, Donald MacLennan.
The visit resulted in the discovery of many archaeological sites
that were previously unrecorded. Amongst the finds were a probable
Dun; several fine examples of rock-cut basins; a possible shell
mound; and the remains of several stone structures.
group has found rock-cut holes and basins all around the coast
of Coll. There are several theories as to their origin. Some believe
them to be prehistoric, related to the cup marks found in many
places. Others think that they are bait holes, used for grinding
shellfish such as limpets in order to attract fish. Another theory
is that they were used for offerings in order to help the safe
return of people out at sea.