Creation of the Till Thematic Layer

The national glacial tills dataset is one of a series of GIS thematic layers designed to help environmental scientists, planners, consultants and contractors assess the characteristics of the ‘near surface’. In particular, it focuses upon the material from which top soils and subsoils (A and B horizons) develop (i.e. from the base of the pedological soil down to approximately 3 m). According to DiGMapGB-50, Glacial Till covers approximately 30% of the land surface and makes up a majority of the Quaternary cover. It is known to be highly variable in its formation and in its particle size and lithological content.