Geological Timelines
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Pre-Proterozoic | Water covered the Earth, but small volcanic islands
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| Proterozoic | 1st Continental blocks, with the interactions between the blocks creating mountains and abyss
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| Phanerozoic: Paleozoic | 540-250 million years, vertebrates in the sea and the start of them on land
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| Phanerozoic: Mesozoic | 250-65 million years, age of the reptiles with dinosaurs on land
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| Phanerozoic: Cenozoic | 65 million years to present, age of mammals
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| Periods of Extinction | Permian extinction changed the ecological structure of the planet; Cretaceous meteor
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| Continental Movements | Paleozoic had six major blocks of land divided into two (Laurentia and Gondulanal); End Paleozoic have the Pangea for 100 million years
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| Trends in Oxygen | Early Paleozoic through Devonian is low in Oxygen and high in CO2; Skyrocketing Oxygen in Devonian and tanking CO2
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| Low Oxygen Means... | Global warming so water has less gas so lower Oxygen levels. So lungs and gas bladders were selected towards most optimal Oxygen consumption
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| High Oxygen Means... | Huge forests, cooler climate.
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| Terrestrial Evolution | Cambrian- mostly barren; Silurian community, small plants, fungi, arthropods; Devonian vascularized systems, tall plants, 1st stratified forests, 1st vertebrates; Carboniferous large forest lots O2, sinking CO2. Reptiles, mammals. Orgin of arthropod fligh
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| Triassic | End Permian extinction allows for more diversity in land and sea with synapsids dominating land with mostly herbivores
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| Jurassic | Major synapsid extinction but greater carbon dioxide allowed for evolution of more efficient respiration in sauropsids to be very large
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| Cretaceous | Flowering plants allowing land diversity explosion
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Created by:
LionsandGiants
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