Determining Relative Age

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Presentation transcript:

Determining Relative Age Chapter 16-2 Determining Relative Age

Processes that change the Earth today are very slow Millions of years would have to have passes to get what we have today

Relative Age Age of rocks and geologic features compared with others nearby Indicates that one layer of rock is older than another Nothing about age

Superposition A layer of rock is older than the layer above it It is younger than the layer below it

Original Horizontality Rock forms in horizontal layers Unless disturbed

Rocks that are not horizontal have been tilted or deformed

Lateral Continuity Sediment is deposited in large, continuous sheets in all lateral directions

Inclusion Piece of an older rock that becomes part of a new rock

Crosscutting Relationships Fault or intrusions are younger than the rock it cut through

Unconformity Area where rock has been eroded away Gap in rock record New layer deposited on old

Correlation Matching rocks from separate locations

Index Fossils Fossils widespread, abundant, and distinct Lived during a short time span