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6 principles of Relative Dating

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diuondre burks

on 11 October 2012

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Transcript of 6 principles of Relative Dating

Principle of Superposition Principle of Faunal Succession Principle of Relative Dating 6 Principle of Faunal Succession: groups of plant and animal fossils that appear in the geologic record in specific order. Principal of Crosscutting Relations A fault that cuts across another rock unit. The fault must be younger than the unit it cuts across. Principle of original horizontality when sedimentary rock layers are deposited,gravity forces them to be deposited as flat horizontality. Principle of Inclusion When a rock that contains an inclusion of pre-existing rocks the inclusion must be younger than the rock it is on. Principle of Metamorphic Rock happens during weathering, erosion, or heat and pressure in a rock. Metamorphic rock is the oldest rock Principle of Superposition: is used by scientist to determine relative rock ages of sedimentary rock. The youngest rock layers are at the top of rock formations. The oldest rock layers are at the bottom of rock formations. en.wikipedia.org geology.about.com hays.outcrop.org ehow.com cosscience1.pbworks.com The Grand Canyon is an example of a rock formation with at least 4 of the 6 principles of relative dating. Examples: Principle of Superposition is demonstrated by the numerous amount of rock layers within it. Principle of Cross-Cutting is demonstrated with the amount of cuts and faults across rocks caused by weathering and glaciers.
Principle of Fannual Succession is demonstrated by the amount of fossils within the Grand Canyon from many years ago when oceans ran through the canyon. Many organisms died off and were buried in the dirt for many years. Principle of Original Horizontality is demonstrated by the following picture below: earth.rice.edu
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