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Vertebrate Zoology

Geological Timelines

QuestionAnswer
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
Created by: LionsandGiants