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Posted by / 23-Sep-2019 10:32

To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.

These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.

Although with clever detective work many complex time sequences or relative ages can be deduced, the ability to show that objects at two separated sites were formed at the same time requires additional information.

A coin, vessel, or other common artifact could link two archaeological sites, but the possibility of recycling would have to be considered.

Unlike ages derived from fossils, which occur only in sedimentary rocks, absolute ages are obtained from minerals that grow as liquid rock bodies cool at or below the surface.

When rocks are subjected to high temperatures and pressures in mountain roots formed where continents collide, certain datable minerals grow and even regrow to record the timing of such geologic events.

The two approaches are often complementary, as when a sequence of occurrences in one context can be correlated with an absolute chronlogy elsewhere.

For example, the presence of recycled bricks at an archaeological site indicates the sequence in which the structures were built.

Similarly, in geology, if distinctive granitic pebbles can be found in the sediment beside a similar granitic body, it can be inferred that the granite, after cooling, had been uplifted and eroded and therefore was not injected into the adjacent rock sequence.

By mid-century the fossiliferous strata of Europe had been grouped into systems arrayed in chronological order.

The stratigraphic column, a composite of these systems, was pieced together from exposures in different regions by application of the principles…

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The results suggest that the present-day global tectonic scheme was operative in the distant past as well.plate tectonics has had a profound impact on the scientific understanding of our dynamic planet.

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  2. Bernd Seiler reports (23rd February 1999) "Steam on the Rio Gallegos system finished some time in 1997 following the arrival of diesels." Ian Thomson (18th October 1999) places it in November 1996 although steam was used with diesels for braking purposes into 1997.