GEO 1111 Lecture Notes - Lecture 6: Ripple Marks, Exponential Decay, Parent Material
17 Jul 2014
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GEO 1111 Full Course Notes
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Joly, (1890"s): 90-100 ma (ocean salinity model) eo-1900"s: 3 ma to 1600 ma (sediment deposition model) Dating: relative dating compare 2 or more entities to determine which is older, numerical dating specifying the actual number of years ( years) that have passed since an event occurred (also known as absolute age dating) Rules to compare rocks that are not located near one another: principal of uniformitarism (hutton) Vertical correlation (look up: superposition, horizontality, x-cutting relations. Correlation of rock layers: matching of rocks of similar ages in different regions is known as correlation, vertical and horizontal relationships of rocks. William smith (late 1700s) noted that sedimentary strata in widely separated area could be identified & correlated by their distinctive fossil content. Sometimes relative dating is enough, but other times we need to know the age (in years) of a rock or geologic event. Common numerical dating relies on the rate of decay of radioactive isotopes w/in minerals.
