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The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).
Because defining a GSSP depends on finding well-preserved geologic sections and identifying key events, this task becomes more difficult as one goes farther back in time. Before 630 million years ago, boundaries on the geologic timescale are defined simply by reference to fixed dates, known as "Global Standard Stratigraphic Ages" (GSSAs).
Bedrock geological map of Ireland. Layers of Upper Carboniferous sedimentary rocks, Loop Head, County Clare. The geology of Ireland consists of the study of the rock formations on the island of Ireland. It includes rocks from every age from Proterozoic to Holocene and a large variety of different rock types is represented.
The organisation managed the Irish National Seabed Survey (INSS, 1999–2005), which on completion was the world's largest civilian marine mapping programme. The INSS mapped all of Ireland's waters over 200 m deep, principally in support of territorial claim, and covering over 600,000 km 2. Since 2006, Geological Survey Ireland has managed the ...
A geologic map or geological map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults , folds , are shown with strike and dip or trend and plunge symbols which give three-dimensional orientations features.
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Life expectancy by world region, from 1770 to 2018. Items portrayed in this file depicts. ... Date/Time Thumbnail Dimensions User Comment; current: 22:15, 31 October ...
In just the past two decades, 2000 — 2019, the average global life expectancy increased from 66.8 years to 73.4 years while healthy life expectancy has also improved by 8% over the same period.