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 "description": "In terms of time scale in geology, Quaternary is the present-day time and it began 2.6 million years ago. A lot of this time period relates to the Ice Age. Quaternary geomorphology is the record of landscape features that were created in the last 2.6 million years. In Ireland, movement of glaciers and ice sheets created many of these features. Subglacial landforms are created beneath the ice. They were created during ice expansion. Crags are formed when a glacier or ice sheet passes over an area that contains a particularly strong rock. The force of the glacier erodes the surrounding softer material, leaving a rocky streamlined hill (crag). The crag often serves as a partial shelter to softer material in the aftermath of the glacier. A tapering tail of material is often left behind on the down-ice side of the crag. Where the tail is formed of weaker rock, the feature forms a streamlined bedrock ridge.Drumlins are smooth, oval-shaped hills, shaped like a half-buried egg.  They are made up of glacial till. As the glaciers retreated, they left these deposits behind. The exact process of drumlin formation is unknown.Mega-scale glacial lineations, like drumlins, are typically smooth hills of subglacially-deposited material, but are much longer. They are produced beneath zones of fast-flowing ice.Geologists map and record evidence during field visits, from air photographs and from Digital Elevation Models (DEMs). Lines are drawn on a map to show where features are found. We collect new data to update our map and also use data from other sources.This map shows the currently mapped large Subglacial Lineations in Ireland.This map is to the scale 1:50,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 500m.It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).The data is shown as lines. Each line holds information on the glacial landform type, data source, data reference and its unique identifier. ",
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