Editor's note: This website was started when I was a geology student in college. My goal was to create a site that focused on geology, but fate had something else in store for this site. It was my chemistry section that drew the most interest and thus was where I focused most of my efforts. Eventually, for unrelated reasons, I changed majors and I'm afraid this timeline was my first and last foray into the geology direction.
|Paleocene||58-66||Extinction of dinosaurs|
|Jurassic||144-208||1st birds & mammals|
|Paleozoic||Permian||245-286||Amphibians||End of trilobites|
|Mississippian||320-360||Large primitive trees|
|Silurian||408-438||First land plant fossils|
|Cambrian||505-570||1st shells, trilobites dominant|
|Proterozoic||Also known as Precambrian||570-2,500||1st Multi-celled organisms|
|Archean||2,500-3,800||1st one-celled organisms|
|Hadean||3,800-4,600||Approx age of oldest rocks 3,800|
Reference: Graham R. Thompson, Jonathan Turk,
If you need to cite this page, you can copy this text:
Kenneth Barbalace. Geologic Time Scale. EnvironmentalChemistry.com. 1995 - 2023. Accessed on-line: 5/27/2023
If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:
<a href="https://EnvironmentalChemistry.com/yogi/geo-time.html">echo Geologic Time Scale (EnvironmentalChemistry.com)</a>- Earths geologic time scale in a tabular format.
NOTICE: While linking to articles is encouraged, OUR ARTICLES MAY NOT BE COPIED TO OR REPUBLISHED ON ANOTHER WEBSITE UNDER ANY CIRCUMSTANCES.
PLEASE, if you like an article we published simply link to it on our website do not republish it.