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Geologic Time Period
YGK These Geologic Time Periods
| Question | Answer |
|---|---|
| Hadean Eon timeframe | 4600 to 4000 mya |
| Definition of Hadean Eon | Formation of Earth to oldest known rocks |
| Moon formation date | 4500 mya |
| Liquid water ocean formation date | 4400 mya |
| Archean Eon timeframe | 4000 to 2500 mya |
| Fossilized microbial mats proving early life | Stromatolites |
| Proposed period of increased impacts (4100–3900 mya) | Late Heavy Bombardment (LHB) |
| Proterozoic Eon timeframe | 2500 to 541 mya |
| Rise of oxygen via cyanobacteria | Great Oxidation Event (GOE) |
| Hypothesis of a fully frozen Earth | Snowball Earth |
| First known multicellular organisms with tissues | Ediacaran biota |
| Current eon of abundant plant and animal life | Phanerozoic Eon |
| Cambrian Period timeframe | 541 to 485 mya |
| Rapid diversification of animal phyla | Cambrian Explosion |
| British Columbia fossil deposit for Cambrian life | Burgess Shale |
| Burrowing animals altering ocean chemistry | Cambrian Substrate Revolution |
| Ordovician Period timeframe | 485 to 444 mya |
| Colonization of land by plants | Ordovician Period |
| Second largest mass extinction cause | Late Ordovician glaciation |
| Silurian Period timeframe | 444 to 419 mya |
| Tissues with lignin for water transport | Vascular plants |
| First evolution of jaws and bones | Silurian fish |
| Devonian Period nickname | Age of Fishes |
| Ancestors of four-limbed vertebrates | Tetrapods |
| Devonian Explosion innovation | First leaves, roots, and seeds |
| Late Devonian Mass Extinction cause | Global cooling and marine anoxia |
| Carboniferous Period timeframe | 359 to 299 mya |
| Two halves of the Carboniferous | Mississippian and Pennsylvanian |
| Source of Carboniferous coal deposits | Lignin-rich trees and ferns |
| Atmospheric oxygen level during Carboniferous | 35% |
| Effect of high oxygen on insects | Gigantism |
| Carboniferous Period nickname | Age of Amphibians |
| Supercontinent formed during the Carboniferous | Pangaea |
| Permian Period timeframe | 299 to 252 mya |
| Amniote group ancestors to mammals | Synapsids |
| Amniote group consisting of reptiles | Sauropsids |
| The "Great Dying" extinction | Permian Mass Extinction |
| Cause of Permian Mass Extinction | Siberian Traps eruption |
| Triassic Period timeframe | 252 to 201 mya |
| Reptile group including crocodile ancestors and dinosaurs | Archosaurs |
| Dominant archosaur group of the Triassic | Pseudosuchians |
| Triassic extinction result | Rise of the dinosaurs |
| Jurassic Period timeframe | 201 to 145 mya |
| Colorado fossil formation for well-known dinosaurs | Morrison Formation |
| Transitional species between dinosaurs and birds | Archaeopteryx |
| Jurassic flying reptiles | Pterosaurs |
| Jurassic marine reptiles | Ichthyosaurs and plesiosaurs |
| Cretaceous Period timeframe | 145 to 66 mya |
| First appearance of flowering plants | Angiosperms |
| Seaway that split North America | Western Interior Seaway |
| Dominant Cretaceous marine reptiles | Mosasaurs |
| Cretaceous-Paleogene extinction cause hypothesis | Álvarez Hypothesis |
| Evidence for the impact event | Iridium layer and Chicxulub crater |
| Cenozoic Era nickname | Age of Mammals |
| Initial peak in Cenozoic temperatures | Paleocene-Eocene Thermal Maximum (PETM) |
| Paleogene epoch when Antarctica froze | Oligocene |
| Current geologic period | Quaternary |
| Epoch of cyclical ice ages and megafauna | Pleistocene |
| Evolutionary appearance of humans | Homo sapiens |
| Current geologic epoch | Holocene |
Created by:
divyap
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