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16 Cards in this Set
- Front
- Back
Paleozoic Era 541 Ma - 252 Ma |
Permian 299 Ma Pennsylvanian 323 Ma Mississippian 359 Ma Devonian 419 Ma Silurian 444 Ma Ordovician 485 Ma Cambrian 541 Ma |
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Mesozoic 252 Ma - 66 Ma |
Cretaceous 145 Ma Jurassic 201 Ma Triassic 252 Ma |
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Cenozoic 66 Ma - present |
Quaternary 2.6 Ma - Present Paleogene/Neogene 66 Ma |
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Precambrian Time |
1. Shield regions of the continents form 2. Outgassing of atmosphere/oceans 3. Simple forms of life: a. Stromatolites (first fossils) 3.5 Ga, b. blue/green Algae. |
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Cambrian Period about 541 Ma |
- (Great) diversification of life forms - First organisms with shells and fish (more records can be preserved) - North America tectonically quiet |
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Ordovician Period |
- First Plants - Trilobites prominent - Appalachian mountains rise for first time |
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Silurian Period |
- Land plants become common by the end - Large salt basin from NY to IL
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Devonian Period |
- "Age of Fishes" eating tribolites - First insects and amphibians - Appalachians rise for second time/ North America grew |
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Mississippian Period (Drainage Basin) |
- Amphibians abundant - First reptiles - North America warm & tropical - Oldest coal |
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Pennsylvanian Period |
- Large coal swamps from PA to IL - First reptiles - Appalachians rise for third and final time - Ancestral Rocky Mountains form (Colorado, Montana, Utah) |
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Permian Period |
- Pangea formed / one large continent (not the only continent other small ones as well - "The Great" extinction at end 80-95% of sea life dies & 75% of amphibians - 9/10 species extinct - extensive volcanism - H2S gas (Hydrogen disulfide) - burning coal from volcanic actions - ocean changes |
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Triassic Period |
- Dinosaurs dominant - First confirmed small animals - Pangea begins to rift - Mammals appear |
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Jurassic Period |
- First birds appear (descendants of reptiles) |
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Cretaceous Period |
- The real "Jurassic Park" - First flowering plants - Great inland sea of North America - Second largest extinction at end (Climate change) - Rocky Mountains begin to form |
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Paleogene/Neogene |
- Mammals replace reptiles - North America coastal ranges (Cascade Mountains)
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Quaternary |
- Glaciations - Present warming |