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To produce this dataset, the twenty one 1:100,000 paper maps covering Ireland were digitised. Inconsistencies between map sheets were fixed. We collect new data to update our map and also use data made available from other sources. This map is to the scale 1:100,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 1km.It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).The geological line data is shown as lines. Each line holds information on: description of the line, bedrock 100k map sheet number, style and label information. Other information if relevant such as name, stratigraphy code (rock layers with age profile) & lithology code (rock type). Each line is linked to the bedrock linework lexicon table which has more detailed information such as a definition of the rock unit, rock types, age, thickness and other comments. 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