Chronological dating methods
At a regional scale, several indicators point to transient fluvial response resulting from major tectonic activity in this area, especially rock uplift in the Beni Snassen massif.The latter strongly influenced drainage organisation, and therefore landscape evolution, in northeast Morocco.
Scientists have dated the fluvial terraces of the Lower Moulouya river in northeast Morocco.
An unprecedented combination of dating methods has helped to construct a chronological framework to decipher environmental changes over the past 1.5 million years at a local and regional level.
Using this established record, geologists have been able to piece together events over the past 635 million years, or about one-eighth of Earth history, during which time useful fossils have been abundant.
The need to correlate over the rest of geologic time, to correlate nonfossiliferous units, and to calibrate the fossil time scale has led to the development of a specialized field that makes use of natural radioactive isotopes in order to calculate absolute isotopes has been improved to the point that for rocks 3 billion years old geologically meaningful errors of less than ±1 million years can be obtained.
Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments.
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To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.This then can be used to deduce the sequence of events and processes that took place or the history of that brief period of time as recorded in the rocks or soil.For example, the presence of recycled bricks at an archaeological site indicates the sequence in which the structures were built.Similarly, in geologic studies, vast quantities of information from widely spaced outcrops have to be integrated.Some method of correlating rock units must be found.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.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.The Lower Moulouya river is the largest drainage network in Morocco.It is located in the tectonically active convergence zone between Africa and Europe.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.Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present.