Deep Time - Chapter 10 Deep Time: How Old is Old? Geologic...

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Deep Time: How Old is Old? Chapter 10
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Geologic Time Definition: Span of Time since the Earth’s Formation What is DEEP TIME? A trip into the distant past Rocks tell parts of the story of Earth’s history When walking down into the Grand Canyon, for example, you are traveling back through Earth’s history
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Geologic Time John Wesley Powell Famous explorer In 1869, took a team of 9 geologists and scouts through the largest canyon on Earth The Grand Canyon has been a major piece of Earth’s history puzzle The team posed many questions that helped with reconstructing Earth’s past, such as: Did the Colorado River sculpt the Canyon? When did the rocks making the walls of the Canyon form? Was there a time before the layers of the Canyon accumulated?
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Geologic Time James Hutton – the Father of Geology 1726-1797, from Scotland First to think that the Earth existed for a long period of time prior to humans Lived during the “Age of Enlightenment” When philosophers and scientists thought “outside the box”, outside of the constraints of religious dogma Same time when Sir Isaac Newton developed his physical laws, Laws of Motion The time when “big thinkers” looked for answers to explain the Universe in nature, not supernatural
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Principle of Uniformitarianism James Hutton developed this principle, which provided the foundation of geology Principle of Uniformitarianism The present is the key to the past. The physical processes we observe today also operated in the past and were responsible for the formation of the geologic features observed in outcrops today Hutton reasoned that if this idea was true, then the Earth had to be much older than human history because geologic processes work very slowly
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Death Valley, CA: same processes
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Deep Time - Chapter 10 Deep Time: How Old is Old? Geologic...

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