Monday 21 February (Zoom Meeting): 'The Rocks That Don't Belong'. Speaker: Dr. Martha Johnson, University of Highlands and Islands, Orkney. This talk will explore the geological basis for understanding the rock at the Ness of Brodgar, Orkney. All stone is rock but most rock is not stone. In the index or glossary of most geology texts there is no listing for stone. Conversely, in most archaeology texts, there is no listing for rock. 'The Rocks That Don't Belong' research project is investigating the non-structural, non-tool rocks recovered from the Late Neolithic site, the Ness of Brodgar, Orkney.