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Definition of Geologic time scale

Geologic time scale Definition from Business & Finance Dictionaries & Glossaries
Glossary of petroleum Industry
According to authorities in the study of the earth, the Paleozoic Era represents the oldest rocks whose ages are 225 to 600 million years old the next title next era is the Mesozoic with rocks 75 to 225 million years old; the most recent era, the Cenozoic, has rocks from the present to 75 million years old. Dividing these eras are periods. Beginning with the they are Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian and Permian, all in the Paleozoic Era. In the Mesozoic Era are the Triassic, Jurassic and Cretaceous Periods. In the youngest era Cenozoic are the Tertiary and Quaternary. Geologists have divided the Quarternary Period, identifying the earlier epoch of the Quarternary Period as Pleistocene. Geologic time scale the long periods of time dealt with and identified by geology. Geologic time is divided into eras (Cenozoic, Mesozoic, Cambrian, and Precambrian), which are subdivided into periods and epochs. When the age of a type of rock is determined, it is assigned a place in the scale and thereafter referred to as Mesozoic rock of the Triassic period and so on.
Geologic time scale Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
The geological time scale (GTS) is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth’s history. The table of geologic time spans presented here agrees with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy.

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