1 / 7

The geologic time scale divides Earth’s history based on major past events.

The geologic time scale divides Earth’s history based on major past events. Earth formed about 4.5 billion years ago!. Index fossils can provide the relative age of a rock layer. existed only during specific spans of time occurred in large geographic areas. fusulinids. trilobites.

frederickl
Download Presentation

The geologic time scale divides Earth’s history based on major past events.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The geologic time scale divides Earth’s history based on major past events.

  2. Earth formed about 4.5 billion years ago!

  3. Index fossilscan provide the relative age of a rock layer. • existed only during specific spans of time • occurred in large geographic areas fusulinids trilobites

  4. The geologic time scale organizes Earth’s history.Divided into eons, eras, periods, and epochs. Precambrian 4.5 bya – 544 mya Oldest rocks/fossils Origin of eukaryotes Cyanobacteria 88% of geologic time

  5. Paleozoic “ancient life” 544-248 mya, fish, arthropods, amphibians, reptiles • Mesozoic “middle life” 248-65 mya reptiles, dinosaurs, birds, small mammals, fish • Cenozoic “recent life” 65 mya –present mammals, primates, fish, birds

  6. We live in the Quaternary period of the Cenozoic era

More Related