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Geologic Time- A method of looking back at earth’s history based on the information preserved in the fossils and other rock structures of the rock record.

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Presentation on theme: "Geologic Time- A method of looking back at earth’s history based on the information preserved in the fossils and other rock structures of the rock record."— Presentation transcript:

1 Geologic Time- A method of looking back at earth’s history based on the information preserved in the fossils and other rock structures of the rock record. Geologic Time Scale-A summary table of the geologic history of the earth. Organized into divisions based on major changes or events that took place 4 Eras 15 Periods D Tertiary

2 GEOLOGICTIMESCALEGEOLOGICTIMESCALE

3 ERA- largest time division, oldest at bottom, most recent at top 32) Cenozoic 25) Mesozoic 9) Paleozoic 2) Precambrian

4 3)Hadean : 4.6 BYA-3.8 BYA -Solar System started to form - Protoplanet formed

5 5)Archean 3.8BYA – 2.5BYA - planet cooling -minerals form -oceans form -1 st life (bacteria & stromatolites- in oceans) -Cratons form – (original continent- most ancient rocks) ~ 3.5 BY

6 7)Proterozoic : 2.5 BYA-540 MYA -Large amount of SIMPLE LIFE -only in ocean; worms, jellyfish, bacteria

7 10)Cambrian MYA -Trilobites thrive -Brachiopods numerous -1 st vertebrates seen (backbone)

8 12)Ordovician MYA -Appalachian Mountains form -Jawless fish seen

9 14)Silurian : MYA - 1 st plants -1 st jawed fish -1 st land animals

10 16)Devonian MYA Air breathing fish 1 st amphibians Insects Bony Fish

11 18)Mississippian MYA -Ferns thrive -Amphibians common

12 20)Pennsylvanian MYA - 1 st reptiles -coal forming swamps -location of coal today

13 22) Carboniferous

14 23)Permian: MYA - mammal-like reptile -mass extinctions

15 26)Triassic : MYA - 1 st dinosaurs -volcanoes on east coast of N.A. -Conifer trees -1 st mammals

16 28)Jurassic : MYA - 1 st birds -Dinosaurs dominate

17 30)Cretaceous: MYA -1 st flowers - Bees -dinosaurs become extinct -Rocky Mtns form

18 33)Tertiary : MYA Mammals thrive 1 st human-like creatures seen hominids (hominids)

19 Quaternary: 1.5 MY- Present -Modern people -Civilization -Cities

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