What is the geologic time scale

The Phanerozoic eon, which began million years ago, is the eon during which life has been visible and abundant on Earth. It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages.

In conclusion, the Geologic Time Scale is a versatile and indispensable tool for a wide range of scientific and practical applications. The enumeration of those geologic time units is based on stratigraphy, which is the correlation and classification of rock strata.

Notes The divisions of the geologic time scale are organized stratigraphically, with the oldest at the bottom and youngest at the top. Eras are subdivisions of eons, and they span tens to hundreds of millions of years. It uses chronostratigraphy and geochronology to define and correlate units of geologic history, from eons to ages.

Oligocene epoch: Types of Fossils and the Fossilization Process. The Mississippian Period is a division of the Carboniferous Period and covers the time interval between and million years ago.

By studying the Permian Period, we can gain a deeper understanding of the history of the Earth and the evolution of life, and we can also learn about the interplay between environmental change and the evolution of species. They have created a tool for measuring geologic time, breaking it into useable, understandable segments.

Chronostratigraphic,Geologic Time Scale. Pliocene epoch: 5. Today, it is a critical tool for understanding the history of our planet, and it continues to be refined as new data and techniques become available. Next Post Previous Post. The geologic time scale is the “calendar” for events in Earth history.

Dinosaurs were highly diverse and ranged in size from small, feathered birds to large herbivores and carnivores, such as Stegosaurus and Allosaurus. The Archean Eon also saw the formation of the first continents and the first stable environments suitable for life.

It was a time of recovery from the Cretaceous mass extinction. These are most commonly obtained by radiometric dating methods performed on appropriate rock types. In addition to the evolution of fish, the Devonian Period was also marked by significant changes on land.

The Paleogene Period is the first period of the Cenozoic Era. Toggle navigation Menu. The Geologic Time Scale (GTS) is a chronological framework that organizes Earth’s history into various units based on geological and paleontological evidence.

It divides Earth’s billion-year history into hierarchical units such as eons, eras, periods, epochs, and ages. Examples of geologic epochs Paleocene epoch: The geologic time scale is a representation of time based on the rock record of Earth.

Marston Marble. In conclusion, the Silurian Period is a critical time interval in the history of the Earth, characterized by significant changes and diversification in the evolution of life on Earth, including the evolution of the first vascular plants and armored fish.

The next subdivision of the timescale is the Phanerozoic Eon The Permian Period is a division of the Paleozoic Era and covers the time interval between and million years ago.