How did the geological time scale evolve?

The geological time scale originated in 1815, when the builder of the channel on behalf of William Smith noticed the relationship between the layers of rocks and the fossils found in them. At this time, fossils were considered to be devilish artifacts or inorganic mineral arrangement, but these fossils were the key to the arrival of a geological timer.

Being a channel, Smith looked at the rocks quite often. Certain layers began to associate certain fossils. The geology field flourished at that time and directed attention to this matter. Scientists from all over the world began to observe the correlation of fossil layers, but only in the mid -19th century was published Darwin's origin of species and began to gain credibility. Fossils were organisms that lived in different time periods. The rock layers and the thume periods in which they created have acquired names and classifications. This is a geological time scale. The first era in the geological time scale is Precambrian , from which faded f are found fOsilia. Another is paleozoic era (ancient life), followed by mezozoic (middle life) and Custoic (modern life).

The era subdivision, the period, were generally named in places where fossils were found from this period. For example, the Devonian period is named after Devonshire in southwestern England and Permian after the Kingdom of Perm in Russia. One exception, a circular period, is derived from the Latin word Creta , which means "chalk". This is because the associated fossils were discovered in the chalk cliffs on the coast of England. The period of geological time scale has a variety of reasons for their names.

Epochs on a geological timer are given specific names only for the cenozoic era, the latest. In the Pleistocene epoch, which is called Greek words, which means "the most" and "recent", 90% of discovered fossils are species that still live to this day.Previously, it was an eocene epoch whose only 1% - 5% are still alive. Of all the species that have ever lived on Earth, only a small percentage are present.

Thanks to radioactive dating, scientists are now able to identify fossil age with extreme accuracy and convincingly connect each fossil with its specific period or epoch on a geological time scale. This helps us follow the relics of the evolutionary tree that has branched in billions of directions.