The Geologic Time Scale (Chronological Order)
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The Geologic Time Scale (Chronological Order)
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Detailed description on the chronology of the earth. reported are the very good source of information
The Geologic Time Scale (Chronological Order)
- Jason John V. Tabujara BSEdGS IV STA RT
- WHAT IS A GEOLOGIC TIME SCALE? System of chronologic measurement relating to stratigraphy to time that is used by geologist and other earth scientists
- INTRODUCTION TO CONCEPT: The period is the basic unit of geological time in which a single type of rock system is formed. Two or more periods comprise a geological Era. Two or more Eras form an Eon, the largest division of geologic time. Some periods are divided into epochs. The major periods in the geologic history of the Earth are (mya=million years ago):
- INTRODUCTION TO CONCEPT: Eon Era Period Epoch Period Era Period
- Hadean, Archean and Proterozoic Eons
- PRECAMBRIAN Hadean Eon 4.6 to 3.9 billion years ago “Rockless Eon" - The solidifying of the Earth's continental and oceanic crusts. Archeozoic Eon (Archean) 3.9 to 2.5 billion years ago "Ancient Life" The first life forms evolve Proterozoic Eon 2.5 billion years ago to 540 mya *multi-celled, animals appear, including sponges. *Single supercontinent called Rodinia. *First multicellular life: colonial algae and soft-bodied invertebrates appear.
- Paleozoic Era
- PHANEROZOIC EON Paleozoic Era: The Paleozoic is bracketed by two of the most important events in the history of animal life. 1. Multicellular animals went dramatic diversity explosion 2. Largest Mass extinction of mostly 90% of marine organisms
- PALEOZOIC ERA Cambrian Period "The Age of Trilobites" 540 to 500 mya
- PALEOZOIC ERA Ordovician Period 505 to 438 mya
- PALEOZOIC ERA Silurian Period 438 to 408 mya
- PALEOZOIC ERA Devonian Period "The Age of Fishes" 408 to 360 mya
- PALEOZOIC ERA Carboniferous Mississippian Period 360 to 325 mya
- PALEOZOIC ERA Carboniferous Pennyslvanian Period 325 to 280 mya
- PALEOZOIC ERA Permian Period "The Age of Amphibians" 280 to 248 mya
- Mesozoic Era
- PHANEROZOIC EON Mesozoic Era: Many of the Old life forms had just gone extinct in the Permian Extinction, the world’s largest mass extinction. Depleted state was followed by an explosion of new life forms such as dinosaurs, mammals, birds and flowering plants
- MESOZOIC ERA Triassic Period 248 to 208 mya
- MESOZOIC ERA Jurassic Period 208 to 146 mya
- MESOZOIC ERA Cretaceous Period 146 to 65 mya
- Cenozoic Era
- PHANEROZOIC EON Cenozoic Era: The most recent Era of the three major subdivisions of animal history. Also called as the Age of Mammals 65.5 million years ago to present
Notas do Editor
- The first dinosaurs, mammals, and crocodyloformes appear. Mollusks are the dominant invertebrate. Many reptiles, for example, turtles, ichthyosaurs. True flies appear. Triassic period ends with a minor extinction 213 mya (35% of all animal families die out, including labyrinthodont amphibians, conodonts, and all marine reptiles except ichthyosaurs). This allowed the dinosaurs to expand into many niches.