Quaternary Geomorphology 1:50,000 Ireland (ROI) ITM

Téama: Science
Tuairimí: 5
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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 shows features left on the earth’s surface during this time. Glaciers and ice sheets, which are masses of ice that flow slowly over the landscape, created these features. Quaternary Geomorphology can also be described as Glacial landforms. These features include; boulders moved by ice (Erratic Carriages), shapes left on the land from when it was beneath ice (Subglacial Landforms), shapes left on the areas of land that where near or beside ice (Ice Marginal Landforms), shapes cut into mountains by ice (Mountain Glaciation). Geologists collected some of the data shown on the map using tablets while visiting these sites. More data came from books and articles. The data along with images taken from planes and satellites (Remote Imagery) as well as models of the height of the earth’s surface (Digital Elevation Model) was used to draw these features on a map. This map is to the scale 1:50,000 (1cm on the map relates to a distance of 500m). It is a vector dataset. Vector data shows the world using points, lines, and polygons (areas). This map shows data as points, lines and areas. Erratic Carriage areas show the origin of the boulders (Source) and lines show where they are now (Sink). The Subglacial Landforms lines show where ice carved the land as they passed over, leaving scratch marks on rocks (Striae and Lineations), and areas show where ice left behind mounds of debris (Moraines).
Ice Marginal Landforms lines and areas show where water flowed through and away from ice (Meltwater), as well as areas where melting ice left behind mounds and hollows in the ground (Deglacial).
Mountain Glaciation lines show where the top of the ice left a mark on the side of a valley (Trim line) or where the bottom of the ice cut a bowl shape (Corrie) into the side of the mountain.

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Resource: ESRI REST

URL https://secure.dccae.gov.ie/arcgis/rest/services/Quaternary/QuaternaryGeomorphology/MapServer/8

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