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Questions and Answers
What is the primary purpose of dividing the geological time scale into eons, eras, periods, and epochs?
What is the primary purpose of dividing the geological time scale into eons, eras, periods, and epochs?
To organize Earth's history
During which eon did the oxygen levels in the atmosphere rise and multicellular life emerge?
During which eon did the oxygen levels in the atmosphere rise and multicellular life emerge?
Proterozoic
What is the name of the era characterized by the Cambrian explosion, development of fish, amphibians, and reptiles?
What is the name of the era characterized by the Cambrian explosion, development of fish, amphibians, and reptiles?
Paleozoic
In which period did the origin of amphibians occur?
In which period did the origin of amphibians occur?
What was the significance of the Permian period?
What was the significance of the Permian period?
During which era did the dinosaurs dominate Earth's landscapes?
During which era did the dinosaurs dominate Earth's landscapes?
In which period did the origin of flowering plants and modern mammals occur?
In which period did the origin of flowering plants and modern mammals occur?
What is the name of the era characterized by the age of mammals and human evolution?
What is the name of the era characterized by the age of mammals and human evolution?
In which period did the evolution of modern humans occur?
In which period did the evolution of modern humans occur?
What is the name of the current epoch, characterized by the development of human civilizations?
What is the name of the current epoch, characterized by the development of human civilizations?
Flashcards
Geological Time Scale Divisions
Geological Time Scale Divisions
To organize and understand Earth's extensive history through a structured format.
Proterozoic Eon
Proterozoic Eon
The eon when oxygen increased and complex life began to evolve.
Paleozoic Era
Paleozoic Era
The era known for rapid diversification of life, including fish, amphibians, and reptiles.
Devonian Period
Devonian Period
The geological period in which amphibians first appeared.
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Permian Period Significance
Permian Period Significance
Significant due to a major extinction event that marks the end of this period.
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Mesozoic Era
Mesozoic Era
The era when now extinct reptiles such as dinosaurs dominated terrestrial ecosystems.
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Cretaceous Period
Cretaceous Period
The period when flowering plants and modern mammal types started to appear.
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Cenozoic Era
Cenozoic Era
The era known as the 'Age of Mammals' and the evolution of humans.
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Neogene Period
Neogene Period
The time period when modern humans evolved.
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Quaternary Epoch
Quaternary Epoch
The current epoch, characterized by the growth of human society.
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Geological Time Scale
- Divided into eons, eras, periods, and epochs to organize Earth's history
- Based on fossil records, rock layers, and geological events
Eons:
- Hadean (4.5-4 billion years ago): Formation of Earth, no oxygen in atmosphere
- Archean (4-2.5 billion years ago): Development of single-celled life, oxygenation of atmosphere
- Proterozoic (2.5 billion-541 million years ago): Oxygen levels rise, multicellular life emerges
- Phanerozoic (541 million years ago to present): Diverse life forms, development of complex ecosystems
Eras:
- Paleozoic (541-252 million years ago): Cambrian explosion, development of fish, amphibians, and reptiles
- Cambrian (541-485 million years ago): Rapid diversification of life
- Ordovician (485-443 million years ago): Origin of coral reefs
- Silurian (443-416 million years ago): Development of first land plants
- Devonian (416-359 million years ago): Origin of amphibians
- Carboniferous (359-299 million years ago): Development of modern coral reefs
- Permian (299-252 million years ago): Massive extinction event
- Mesozoic (252-66 million years ago): Age of reptiles, dinosaurs dominate
- Triassic (252-201 million years ago): Origin of dinosaurs
- Jurassic (201-145 million years ago): Dinosaurs thrive
- Cretaceous (145-66 million years ago): Flowering plants, modern mammals emerge
- Cenozoic (66 million years ago to present): Age of mammals, human evolution
- Paleogene (66-2.6 million years ago): Origin of primates, development of grasslands
- Neogene (2.6 million-11,700 years ago): Evolution of modern humans
- Quaternary (11,700 years ago to present): Development of human civilizations
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