1 / 5

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

KEY CONCEPT The geologic time scale divides Earth’s history based on major past events. Index fossils are another tool to determine the age of rock layers. Index fossils can provide the relative age of a rock layer. existed only during specific spans of time

adah
Download Presentation

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

  2. Index fossils are another tool to determine the age of rock layers. • Index fossils can provide the relative age of a rock layer. • existed only during specific spans of time • occurred in large geographic areas • Index fossils include fusulinids and trilobites.

  3. 100 250 550 1000 2000 PRECAMBRIAN TIME This time span makes up the vast majority of Earth’s history. It includes the oldest known rocks and fossils, the origin of eukaryotes, and the oldest animal fossils. Cyanobacteria The geologic time scale organizes Earth’s history. • The history of Earth is represented in the geologic time scale.

  4. consist of two or more periods • three eras: Cenozoic, Mesozoic, Paleozoic • Eras last tens to hundreds of millions of years.

  5. most commonly used units of time on time scale • associated with rock systems. • Periods last tens of millions of years. • Epochs last several million years.

More Related