Geological Time Scale
The geological time scale is a system of chronological dating that relates geological strata to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred during the Earth's history.
Eras of the Geological Time Scale
The geological time scale is divided into several eras, each of which is further divided into periods and epochs. The major eras include:
Key Concepts
Key concepts related to the geological time scale include:
- Fossils: Remains or traces of ancient life forms that are found in sedimentary rocks and provide evidence of past life on Earth.
- Rock Strata: Layers of rock that are formed over time and can provide information about the Earth's history.
- Radiometric Dating: A method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.
Study Tips
When studying the geological time scale, consider the following tips:
- Use mnemonic devices to remember the order of the geological time scale divisions.
- Review the characteristics of each era, period, and epoch, including key events and life forms that existed during those times.
- Practice using the geological time scale to interpret the age of rock layers and fossils.
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Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Concepts of Life Science: A student should understand and be able to apply the concepts, models, theories, facts, evidence, systems, and processes of life science. A student who meets the content standard should:
Develop an understanding that all organisms are linked to each other and their physical environments through the transfer and transformation of matter and energy.
Concepts of Earth Science: A student should understand and be able to apply the concepts, processes, theories, models, evidence, and systems of earth and space sciences. A student who meets the content standard should:
Develop an understanding of Earth's geochemical cycles.