BIO211 - Chapter 6 - Chapter 6: Correlation and Dating of...

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Chapter 6: Correlation and Dating of the Rock Record The Geologic Time Scale: - Absolute dating provides a true time scale for the chronological frame-work. - It represents the time a body of rock was deposited - Relative dating is the order of deposition of a body of rock base on position Stratigraphic Units: - Stratigraphy is the study of rock layers (strata) and layering - Stratigraphic Units - a group of adjacent strata distinguished by some physical, chemical or paleontological property, or the unit of time that is based on the age of such strata - A Strata is a layer of sedimentary rock distinguished by some physical, chemical or paleontological property - A Stratigraphic section is an protrusion of formation showing a continuous vertical sequence - Correlation is the procedure of indicating connections between the different layers of rock - Lithologic Correlation – correlation between Stratigraphic units based on rock type. - Temporal Correlation – demonstration that strata in two different geographic areas are the same age. Units of Time: - Time-rock unit is all the strata (rock layers) in the world deposited during a particular interval of time. - This used to be called Chronostratigraphic unit - A time unit is the interval which a time-rock unit was formed. - Geological systems are grouped into Erathems – a time-rock unit consisting of all the rocks that represent a geological era. - This is subdivided into stages: - Stage – the time-rock unit that ranks below a series and consists of all the rocks that represent a geologic age. -
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This note was uploaded on 12/05/2011 for the course BIO 211 taught by Professor Jessica during the Spring '11 term at University of Toronto- Toronto.

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BIO211 - Chapter 6 - Chapter 6: Correlation and Dating of...

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