not Sylt- in the Nordfriesland district of Schleswig-Holstein, in Germany, in the North Sea. No- the Island of Silt is the South Island of New Zealand- an island full of unappreciated silt. Silt as a material has been neglected; its time for silt to be studied more intensively. The great greywacke mountains of the South Island have been partially turned into silt by the action of many mountain glaciers. Some interesting questions emerge: what sort of silt does greywacke produce? what are the controls on greywacke silt production? etc etc
