The Geological time scales A history of earth

The Geological time scales A history of earth

How old is the Earth? • 4. 6 Billion years • 4, 600, 000 • Divided into eras: - Cenozoic - Mesozoic - Palaeozoic - Precambrian

How long was the Paleozoic Era?

How long was the Paleozoic Era? 299 million years

Major events in the Paleozoic Era

Events in the Devonian and Silurian periods

Scale Timeline: Paper Timeline • Today, you will create a scale timeline of Earth’s history on a long sheet of adding machine paper • Scale: 1 inch = 100, 000 years • 4. 6 billion years = 46 inches

Scale Timeline: Paper Timeline You may use: • Meter sticks (even though we’re using inches) • Decimal inch rulers • Your textbooks • Copies from other textbooks • The internet

Earth’s timeline worksheet Table 1 Era Cenozoic Mesozoic Paleozoic Precambrian Date of Event: Years Before Today Distance back from “Today” on Time Line

Table 2 Event Oldest fossils appear Ostracods appear Homo sapiens appear Invertebrate “explosion” occurs Dinosaurs become extinct Pangaea forms First dinosaurs appeared Date of Event: Year Before Today Distance back from “Today” on Time Line

References • Tch Teaching channel, 2017, ‘history of the earth’, Retrieved 14 th March 2017 https: //www. teachingchannel. org/videos/teachinggeological-time • Clark, 2016, ‘Geological time scale’, Retrieved 21 st March 2017, <http: //clarkscience 8. weebly. com/geologic-time-scale. html>