time and geology
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Time and Geology. Relative Age Dating. In trying to understand the creation of the geology of an area prior to the 20 th century techniques, a method referred to as Relative Age Dating was used. - PowerPoint PPT PresentationTRANSCRIPT
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Time and Geology
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Relative Age Dating• In trying to understand the creation of the geology of an area
prior to the 20th century techniques, a method referred to as Relative Age Dating was used.
• Relative Age refers only to the order (i.e. older or younger) of particular events, not the actual age of an event.
• Relative Age Dating is process involving the application of good observation skills and common sense to deduce the sequence of events in a particular area. True age is not relevant.
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Principle of Original Horizontality• This principle is based upon the observation that sediment
usually accumulates or is deposited in horizontal layers
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• X
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Principle of Superposition• This states that in a layered sequence of sedimentary rocks,
the oldest layer is on the bottom and become progressively younger toward the top.
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Principle of Lateral Continuity• This principle state that a layer of sedimentary rock or
sediment extends laterally in all directions until it thins out or terminates
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Principle of Cross-Cutting Relationship• Any event (e.g. fault: intrusions) that cuts through a rock or
another event must be younger that the event it cuts through.
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Principle of Inclusions• This states that inclusions (fragments of rock) of one rock
found in another are always older than the rock they are found in.
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The Principle of Faunal Succession• This principle proposes that fossil assemblages (groups of
fossils) succeed one another through time in a regular and predictable order, from least complex to most complex.
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So what has happened here?What is the oldest rock?What is the youngest rock?
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The end result