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![Page 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.](https://reader034.fdocuments.in/reader034/viewer/2022051417/56649cdb5503460f949a56cf/html5/thumbnails/1.jpg)
• 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
GEOLOGIC
TIME
SCALE
Tertiary
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GEOLOGIC
TIME
SCALE
Tertiary
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ERA- largest time division, oldest at bottom, most recent at top
32) Cenozoic
25) Mesozoic
9) Paleozoic
2) Precambrian
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3)Hadean : 4.6 BYA-3.8 BYA
-Solar System started to form
-Protoplanet formed
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5)Archean 3.8BYA –2.5BYA
-planet cooling-minerals form-oceans form-1st life (bacteria & stromatolites- in oceans)-Cratons form –(original continent- most ancient rocks)
~ 3.5 BY
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7)Proterozoic : 2.5 BYA-540 MYA
-Large amount of SIMPLE LIFE-only in ocean; worms, jellyfish, bacteria
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10)Cambrian 540- 500 MYA
-Trilobites thrive
-Brachiopods numerous
-1st vertebrates seen (backbone)
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12)Ordovician 500- 430 MYA
-Appalachian Mountains form
-Jawless fish seen
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14)Silurian : 430 - 400 MYA
-1st plants-1st jawed fish-1st land animals
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16)Devonian 400- 345 MYA
•Air breathing fish
•1st amphibians
•Insects
•Bony Fish
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18)Mississippian- 345-325 MYA
-Ferns thrive-Amphibians common
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20)Pennsylvanian- 325-280 MYA
-1st reptiles
-coal forming swamps
-location of coal today
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22) Carboniferous
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23)Permian: 280-250 MYA
-mammal-like reptile
-mass extinctions
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26)Triassic : 250-190 MYA
-1st dinosaurs
-volcanoes on east coast of N.A.
-Conifer trees
-1st mammals
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28)Jurassic : 190-135 MYA
-1st birds
-Dinosaurs dominate
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30)Cretaceous: 135-65 MYA
-1st flowers
- Bees
-dinosaursbecomeextinct
-Rocky Mtnsform
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33)Tertiary : 65-1.5 MYA
•Mammals thrive
•1st human-like creatures seen (hominidshominids)
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Quaternary: 1.5 MY- Present
-Modern people-Civilization-Cities
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