1. Warm up
Put EON, PERIOD, AGE, EPOCH, ERA in order from largest to smallest

2. Geologic Time Scale Video

4. Geological Time Scale

5. Precambrian Era Comprises about 88% of geologic time
Longest part of Earth’s history, lasting from 4.0 billion to about 544 million years ago.
Origin of Earth
First one-celled organisms ( Bacteria)
First multi-celled organisms

6. Paleozoic Era First fishes Trilobites dominant
Cambrian Period (540 million years ago)
"""Age of Invertebrates"""
First fishes
Trilobites dominant
First organisms with shells
Ordovician Period (490 million years ago)

7. Paleozoic Era Silurian Period 443 million years ago
"""Age of Fishes"""
First insect fossils
Fishes dominant
"First land plants”
Devonian Period 417 million years ago

8. Paleozoic Era Carboniferous Period:
Mississippian 354 million years ago
"""Age of Amphibians"""
Extinction of trilobites and many other marine animals
First reptiles
"Large coal swamps”
Large Amphibians abundant.
Pennsylvanian 323 million years ago
Permian Period million 290 years ago

9. Mesozoic Era Triassic Period 248 million years ago
"""Age of Reptiles""“
Jurassic Period 206 million years ago
Cretaceous Period 144 million years ago
Ended 65 million years ago
Extinction of Dinosaurs and many other species

10. Mesozoic Era
First flowering plants
First birds
Dinosaurs dominant.

11. Cenozoic Era Paleocene Period 65 million years ago
Eocene Epoch 54.8 million years ago
Oligocene Period 33.7 million years ago
Tertiary Period
Miocene Epoch 23.8 million years ago
Age of Mammals
Pliocene Epoch 5.3 million years ago

12. Cenozoic Era Quaternary Period Pleistocene Epoch 1.8 million years ago
Humans Develop
Holocene Epoch .01 million years ago

13. Geologic Time Scale Webquest
Go To “Useful Links” on my webpage
Click on Geologic Time Scale Webquest for links
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