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The Geological Lines layer shows the details of the structural geology; faults, folds and unconformities. Faults and folds are the result of great pressure being applied to rock across a whole continent or more. These rocks will either break under the pressure, forming faults, or they will bend to form folds. Faults are recorded in the Geological Lines layer as lines where the break in the rock meets the surface. Folds are shown only using the lines of their axes, synclinal (where the rock folds downwards) and anticlinal (where the rock folds upwards). Unconformities are where there is a gap in the rock record, typically where rock has been eroded away in the past and a new rock deposited on top.<\/SPAN><\/SPAN><\/P>

Geologists map and record information on the structural geology. Lines are drawn on a map to show the location and extent of these structures. <\/SPAN><\/SPAN><\/P>

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. <\/SPAN><\/P>

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.<\/SPAN><\/SPAN><\/P>

It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).<\/SPAN><\/SPAN><\/P>

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). 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