Geological Time Scale
The geological time scale is a system of chronological measurement that relates stratigraphy to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history.
Key Concepts:
- Eons: The largest division of time on the geological time scale. The current eon is the Phanerozoic eon, which began around 541 million years ago.
- Eras: Subdivisions of eons. The Phanerozoic eon is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic eras.
- Periods: Subdivisions of eras. For example, the Mesozoic era is divided into the Triassic, Jurassic, and Cretaceous periods.
- Epochs: Subdivisions of periods. The Cenozoic era is divided into epochs such as the Paleogene and Neogene epochs.
Study Guide:
- What is the geological time scale and why is it important in geology?
- Identify and describe the major divisions of the geological time scale.
- Explain the significance of key geological events within each division of the time scale.
- How do scientists use the geological time scale to interpret Earth's history and make predictions about future geological events?
- Discuss the methods used to determine the age of rock layers and the fossils within them.
Understanding the geological time scale is crucial for interpreting Earth's history, studying the evolution of life, and making informed decisions about natural resources and environmental conservation.
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