0
Precambrian
Paleozoic: -cambrian
-ordovician
-silurian
-devonian
-mississippian
-pennsylvanian
-permian
Mezozoic: -triassic
-jurassic
-cretaceous
Cenozoic: -tertiary
-quaternary
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoeons,eras,periods
Add your answer:
Earn +20 pts
What is the purpose of the geologic time scale?
The scale outlines the development of Earth and life on Earth.
What are the major geologic events in the Permian period?
The pangae was formed
Why did geologists develop the geologic time scale?
The geological time scale is the geologic history of the planet from formation to the present. It starts with large divisions of time called eons and is subdivided into successively smaller units of time based on dominant lifeforms, extinction events, even climate. The development of the geologic time scale was initially based on the observation and reasoning that deeper layers of rock are generally older than less deep layers in what is called the "Law of Superposition".Paleontologists look for index fossils in fossil bearing sedimentary rock. Index fossils are organisms that were widespread, rapidly evolving, and only existed for a short period of time as evidenced by their appearance in the fossil record of specific rock strata. The appearance of a fossil alongside an index fossil gives a rough approximation of the age of the fossil in relative terms as it would appear on the geologic time scale. The appearance of the same fossil alongside index fossils of different geologic ages means that the fossil organism spanned multiple geologic time periods. Associations of specific strata alongside radiographically datable igneous and metamorphic rock determines the absolute age of a fossil.A period of around 4,600,000,000 years, the largest groupings of geologic time are eons, followed in descending order by era, period, epoch, and age.The geologic time scale is very important, especially in fields involving the exploration and retrieval of fossil fuels, which are geologically date range specific.
What do periods on the geologic time scale represent?
An era, in geologic terms, is a geological time period encompassing two or more geologic periods.
What are two major divisions of animals?
vertebrae and invertebrate
What information does the geologic time scale provided and what are the major divisions of time?
The information the geologic scale provides is animals and fossils over time and periods. Major divisions of time is called eras.
What information does the geologic time scale provide and what are the major divisions of geological time?
The information the geologic scale provides is animals and fossils over time and periods. Major divisions of time is called eras.
What are the four major divisions of geologic history?
What are the largest divisions of time on the geological time scale?
Eons are the largest divisions of geologic time.
After precambrian time what are the two basic divisions of the geologic time scale?
Era & period Tracy Feng
What are the basic divisions of the Geologic Time Scale from larger to small?
eras and periods
What is the major unit of geologic time?
Era
How did geologists determine the divisions of the geologic time scale?
Mainly abrupt changes in mineral layers or the fossils in them.
Which major division on geologic time came first?
Precambrian time
What is a division on the geologic time scale?
The divisions of the geologic time scale are divided into four eras. from earliest to closer to the present is the Precambrian, Paleozoic, Mesozoic, Cenozoic. During these time periods, there were several major evolutionary events. Most commonly known are the dinosaurs and humans. Hope that helped :)
Which is not a major period of the geologic time scale?
Cenozoic is not a major period of the geologic time scale. The scale is broken down into eras. Cenozoic, Mesozoic and Paleozoic are all part of the Phanerozic era.
What three major divisions make up the geologic timetable?
1. eon 2.era 3.period 4. epoch I'm pretty sure the three major are the first three
