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Vertebrate Zoology
Geological Timelines
Question | Answer |
---|---|
Pre-Proterozoic | Water covered the Earth, but small volcanic islands |
Proterozoic | 1st Continental blocks, with the interactions between the blocks creating mountains and abyss |
Phanerozoic: Paleozoic | 540-250 million years, vertebrates in the sea and the start of them on land |
Phanerozoic: Mesozoic | 250-65 million years, age of the reptiles with dinosaurs on land |
Phanerozoic: Cenozoic | 65 million years to present, age of mammals |
Periods of Extinction | Permian extinction changed the ecological structure of the planet; Cretaceous meteor |
Continental Movements | Paleozoic had six major blocks of land divided into two (Laurentia and Gondulanal); End Paleozoic have the Pangea for 100 million years |
Trends in Oxygen | Early Paleozoic through Devonian is low in Oxygen and high in CO2; Skyrocketing Oxygen in Devonian and tanking CO2 |
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 |
High Oxygen Means... | Huge forests, cooler climate. |
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 |
Triassic | End Permian extinction allows for more diversity in land and sea with synapsids dominating land with mostly herbivores |
Jurassic | Major synapsid extinction but greater carbon dioxide allowed for evolution of more efficient respiration in sauropsids to be very large |
Cretaceous | Flowering plants allowing land diversity explosion |