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Geologic Time Scale

Page history last edited by PBworks 14 years ago

 

 

 

 

 

 

 

Another View of the Geologic Time Scale

EON        | ERA      | PERIOD              | EPOCH      | DATES  | AGE of       | Interesting Biological Events:
Phanerozoic| Cenozoic | Quaternary          | Holocene   | 0-2    | Mammals      | Humans
            |           |                      |Pleistocene|         |               | -
            |           |Tertiary| Neogene  | Pliocene   | 2-5    |               | -
            |           |          |           |Miocene    | 5-24   |               | -
            |           |          |Paleogene| Oligocene  | 24-37  |               | -
            |           |          |           |Eocene     | 37-58  |               | -
            |           |          |           |Paleocene  | 58-66  |               | Extinction of dinosaurs
            |Mesozoic  |Cretaceous                        | 66-144 | Reptiles     | Flowering plants
            |           |Jurassic                          | 144-208|               | 1st birds/mammals
            |           |Triassic                          | 208-245|               | First Dinosaurs
            |Paleozoic |Permian                           | 245-286| Amphibians   | End of trilobites
            |           |Carboniferous| Pennsylvanian     | 286-320|               | First reptiles
            |           |               |Mississippian     | 320-360|               | Large primitive trees
            |           |Devonian                          | 360-408| Fishes       | First amphibians
            |           |Silurian                          | 408-438|               | First land plant fossils
            |           |Ordovician                        | 438-505| Invertebrates| First Fish
            |           |Cambrian                          | 505-570|               | 1st shells, trilobites dominant
Proterozoic | Also known as Precambrian                     | 570-2,500              | 1st Multicelled organisms
Archean    |                                                | 2,500-3,800            | 1st one-celled organisms
Hadean     |                                                | 3,800-4,600            | Approx age of oldest rocks 3,800

 

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