answersLogoWhite

0

AllQ&AStudy Guides
Best answer

The geologic time scale refers to measuring the layers of the earth's crust according to what time in history they refer to. In order, the eras from the Precambrian to the present are as follows: Neoarchean, Paleoarchean, Mesoarchean, Neoarchean, Paleoproterozoic, Mesoproterozoic, Neoproterozoic, Paleozoic, Mesozoic, and Cenozoic.

Q: How long are eras?
This answer is:
Related answers

The geologic time scale refers to measuring the layers of the earth's crust according to what time in history they refer to. In order, the eras from the Precambrian to the present are as follows: Neoarchean, Paleoarchean, Mesoarchean, Neoarchean, Paleoproterozoic, Mesoproterozoic, Neoproterozoic, Paleozoic, Mesozoic, and Cenozoic.

View page

The Archaean eon was a geological eon spanning from around 3800 to 2500 million years ago, comprising the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras - a period in which the first continents and oceans sprang up.

View page

When life originated on Earth is still a hotly debated in science. The evidence available was from already fairly complex bacteria. These bacteria must have evolved from more simple life forms but little or no evidence exists to confirm this.

The first conclusive evidence for life comes from the Neoarchean Era(2,800 - 2,500Ma) about 2.74 billion years ago.

However there is evidence that there was bacteria alive in the Paleoarchean Era(3,600 - 3,200Ma) about 3.45 billion years ago.

View page

The geologic time scale is divided into eons. The eons are broken down into eras, which then are broken down into periods. I will list the correct divisions below.

Eons: Phanerozi, Proterozoic, Archean

Eras: (Phanerozic): Cenozoic, Mesozoic, Paleozoic

(Proterozoic):Neoproterozoic, Mesoproterozoic, paleoproterozoic

(Archean): Neoarchean, Mesoarchean, Paleoarchean, Eoarchean

(Cenozoic)Quaternary, Neogene,Paleogene

(Mesozoic)Cretaceous, Jurassic, Triassic

(Paleozoic)Permian, Carboniferous, Devonian, Silurian, Ordovician, Cambrian

(Neoproterozoic)Ediacaran, Cryogenian, Tonian

(Mesoproterozoic)Stenian, Ectasian, Calymmian

(Paleoproterozoic)Statherian, Orosirian, Rhyacian, Siderian

View page

There have been 4 eons of geological time.

  • Hadean Eon (4576.2 - 4000 Ma)
  • Archean Eon (4,000 - 2,500 Ma)
  • Proterozoic Eon (2,500 - 542 Ma)
  • Phanerozoic Eon (542 Ma - Now)

There have been 10 named eras of geological time.

  • Eoarchean Era (4,000 - 3,600 Ma)
  • Paleoarchean Era (3,600 - 3,200 Ma)
  • Mesoarchean Era (3,200 - 2,800 Ma)
  • Neoarchean Era (2,800 - 2,500 Ma)
  • Paleoproterozoic Era (2,500 - 1,600 Ma)
  • Mesoproterozoic Era (1,600 - 1,000 Ma)
  • Neoproterozoic Era (1,000 - 542 Ma)
  • Paleozoic Era (542 - 251 Ma)
  • Mesozoic Era (251 - 65.5 Ma)
  • Cenozoic Era (65.5 Ma - Now)
View page
Featured study guide
📓
See all Study Guides
✍️
Create a Study Guide
Search results

Resources

Leaderboard All Tags Unanswered

Top Categories

Algebra Chemistry Biology World History English Language Arts Psychology Computer Science Economics

Product

Community Guidelines Honor Code Flashcard Maker Study Guides Math Solver FAQ

Company

About Us Contact Us Terms of Use Privacy Policy Disclaimer Cookie Policy IP Issues
Answers Logo
Copyright ©2024 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.