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Questions and Answers
What is the name of the period in Earth's history that corresponds to the time of "Snowball Earth glaciation"?
What is the name of the period in Earth's history that corresponds to the time of "Snowball Earth glaciation"?
Cryogenian Period
What is the name of the first multicellular organisms that appeared during the Ediacaran Fauna?
What is the name of the first multicellular organisms that appeared during the Ediacaran Fauna?
Soft-body and marine
What is the name of the period before the Phanerozoic Eon?
What is the name of the period before the Phanerozoic Eon?
Precambrian
What specific event marks the beginning of the Phanerozoic Eon?
What specific event marks the beginning of the Phanerozoic Eon?
What epoch marks the beginning of the Quaternary Period?
What epoch marks the beginning of the Quaternary Period?
What is the main characteristic of the Quaternary Period in terms of life on Earth?
What is the main characteristic of the Quaternary Period in terms of life on Earth?
What is the name of the epoch that precedes the Holocene?
What is the name of the epoch that precedes the Holocene?
What major event occurred at the end of the Paleogene Period, marking the beginning of the Neogene?
What major event occurred at the end of the Paleogene Period, marking the beginning of the Neogene?
What significant development in plant life occurred towards the end of the Late Cretaceous?
What significant development in plant life occurred towards the end of the Late Cretaceous?
What type of animals were dominant during the Late Jurassic?
What type of animals were dominant during the Late Jurassic?
What kind of animals were most common during the Early Permian?
What kind of animals were most common during the Early Permian?
What type of vegetation characterizes the Pennsylvanian Period?
What type of vegetation characterizes the Pennsylvanian Period?
What are some significant events that occurred during the Middle Devonian?
What are some significant events that occurred during the Middle Devonian?
What are some key features of the Silurian Period?
What are some key features of the Silurian Period?
Besides the emergence of the first vascular plants, what other major event occurred during the Early Ordovician?
Besides the emergence of the first vascular plants, what other major event occurred during the Early Ordovician?
What noteworthy event happened during the Middle Cambrian?
What noteworthy event happened during the Middle Cambrian?
At the end of the Late Devonian, what major extinction event occurred?
At the end of the Late Devonian, what major extinction event occurred?
What is the oldest undisputed evidence for life on Earth?
What is the oldest undisputed evidence for life on Earth?
Flashcards
Holocene Epoch
Holocene Epoch
The current epoch, lasting from 0.012 million years ago to the present.
Quaternary Period
Quaternary Period
Period encompassing the Holocene and Pleistocene epochs, characterized by significant human development.
Pleistocene Epoch
Pleistocene Epoch
Epoch spanning 2.6 to 0.012 million years ago, known for the last Ice Age.
Pliocene Epoch
Pliocene Epoch
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Miocene Epoch
Miocene Epoch
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Oligocene Epoch
Oligocene Epoch
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Eocene Epoch
Eocene Epoch
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Cenozoic Era
Cenozoic Era
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Neogene Period
Neogene Period
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Paleogene Period
Paleogene Period
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Ediacaran Fauna
Ediacaran Fauna
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Stromatolites
Stromatolites
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Cryogenian Period
Cryogenian Period
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Neoproterozoic Era
Neoproterozoic Era
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Precambrian Distribution
Precambrian Distribution
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Study Notes
Geologic Time Scale
- Earth's history is divided into eons, eras, periods, epochs.
- Precambrian Eon spans from 4.6 billion years ago to 541 million years ago.
- Archean Eon: Oldest known rocks, oldest evidence of life (stromatolites).
- Proterozoic Eon: Oxygen Revolution, first multicellular organisms (Ediacaran fauna).
- Phanerozoic Eon: From 541 million years ago to present, defined by significant fossil record diversification of life, marked by 5 mass extinction events.
- Paleozoic Era: Abundant marine life, rise of amphibians, forests.
- Mesozoic Era: Dinosaurs dominate, rise of mammals, early flowering plants.
- Cenozoic Era: Mammals diversify, dominance of humans.
Life on Earth
- Early life forms were primarily single-celled.
- Oxygen revolution significantly changed Earth's atmosphere and enabled more complex life.
- Multicellular organisms first evolved during the Proterozoic Eon.
- The Cambrian explosion marks a rapid diversification of life in the early Paleozoic.
- Mass extinction events significantly altered the course of evolution.
Fossils and Time Distribution
- Fossils are used to understand the order and relationships of past life.
- Distribution of fossils in rock layers correlates with geologic time intervals.
- Examples of fossils are shown on the image.
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Description
Test your knowledge on Earth's history through its geologic time scale. Explore the divisions of eons, eras, and significant events such as the Cambrian explosion and the rise of mammals. Understand how life evolved along with Earth's changing environment.
