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7 Cards in this Set
- Front
- Back
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Geological Time: Relative Age |
Based on order of formation qualitative method developed 100s of years ago permit determination of older vs. younger relationship assigns order to events |
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Geological Time: Numerical Age (Absolute) |
Actual number of years since event quanitative method developed recently age is given a number assigns exact dates to events |
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Age of Earth |
4.54 Ga Oldest Rocks - Acasta Gneiss in Canada, 4.03 Ga Recycled zircons in sedimentary rocks, doesn't really count, in Austraila are 4.4 Ga Oldest Irish rocks, 1.8 Ga |
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James Hutton - Scottish Physician
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"Father of Modern Geology"
first to articulate "Principale of Uniformitarianism" processes seen today are same as those of past, ancient mudcracks form same as modern geological change is slow modern processes help us understand the past |
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Defining Relative Age: Superposition |
Undeformed layer of rocks: each bed older then bed above and younger then bed below younger strata on top and older strata below |
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Geological Column |
composite stratigraphic column constructed from incomplete sections across globe brackets almost entirety of Human history |
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GO BACK AND LOOK THROUGH POWER POINT |
GO BACK AND LOOK THROUGH POWER POINT |
