ENVIRSC 1G03 Lecture Notes - Lecture 2: James Ussher, Siccar Point, James Hutton
Earth’s Beginnings
Modern Geology and Hutton’s Revolution
Why a revolution?
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Concepts of Modern Geology
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Solar System
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When the Earth was Young
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formed by collision
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Document Summary
In 1650, bishop ussher claimed the earth was created in 4004 bc. The official view before about 1750 was that all sedimentary rocks were laid down in noah"s flood. All other surface features were due to intermittent catastrophes. Uniformitarianism the present is the key to the past . Erosion sliced off pointy tops (took 100 000 000 years) We assume physics has not changed, physical laws that count today, has not changed. Since change it slow the earth is very old: earth is a dynamic planet whose durfac is constantly changing and materials being constantly (re)cycled. Innermost planets, including earth, are small and rocky. Outermost planets are gaseous with rocky cores. Nebula hypothesis of origin of solar system (diagram is textbook) Before there was a solar system there was an array of material, as it contracted (from gravity) it started to spin. As the spinning continued, a disk shape formed and most of the mass formed the sun.